At permanent wilting percentage (PWP) or coefficient (PWC) the soil contains 10-15% water depending upon its texture (about 10% in loam soil). All of the following changes would be likely to decrease the rate of transpiration at 8 A.M. Evaporation from field crops can be estimated using formulae that treat the crop as a single surface. atmospheric humidity, temperature, wind velocity, light, water supply, atmospheric pressure, sprays and dusts and vital activities); Internal or Structural factors (eg. An increase in the air temperature warms the water inside the leaves more quickly causing it to evaporate quicker. What controls the ascent of sap? For most crops completely covering the soil surface only a very small amount of water is lost from the ground surface as evaporation. Atmospheric Humidity: The rate of transpiration is roughly inversely proportional to … Atmospheric pressure. Transpiration & Water Loss Mark Ritenour Indian River Research and Education Center, Fort Pierce Jeff Brecht Horticultural Science Department, Gainesville Water Loss • Typically, 90 to 95% of a commodity is water • Besides resulting in direct loss of salable weight, it Factors that affect the rate of transpiration also affect water uptake by the plant. Factor # 1. Cuticular transpiration decreases with the thickness of cu­ticle and cutinisation of epidermal walls. Availability of Water 7. The factors affecting rate of transpiration can be categorized under two groups: External or Environmental factors (eg. The rate of transpiration is inversely proportional to the relative humidity, i.e., the rate of transpiration is higher when the relative humidity is lower and lower when the relative humidity is higher. Before sharing your knowledge on this site, please read the following pages: 1. TRANSPORT IN MULTICELLULAR PLANTS FACTORS AFFECTING RATES OF TRANSPIRATION – data Transpiration is the process in which plants release the water inside it in the form of moisture or water vapor. This is largely because light stimulates the opening of the stomata . 11/28/2013 10 Relative humidity: As the relative humidity of the air surrounding the plant rises the transpiration rate falls. For 10°C rise in atmospheric temperature vapour pressure inside leaves doubles while relative humidity decreases by 50%. Weather parameters, crop characteristics, management and environmental aspects are factors affecting evaporation and transpiration. Light or Illumina­tion 3. Check my answers: Email my answers to my teacher . Type # A. At this time the rate of transpiration is maximum. Factors Affecting Transpiration. The development of growth chambers in recent years has made possible the control of light, temperature, humidity, and wind velocity. In xerophytes the leaves are also smaller (to reduce the effect of heating) and leathery (to prevent wilting). There are different factors that can affect the rate of transpiration as discussed below. Temperature. Humidity slows the rate of transpiration because there is lower driving force for water vapor to get out of the leaf since there is already a higher RH (relative humidity) in the atmosphere. The factors affecting the rate of transpiration can be categorized into two groups: (A) External or Environmental Factors and (B) Internal or Structural or Plant Factors. Of particular use to learners is an interactive animation that lets them determine the effect of different environmental factors on transpiration rate. Light also speeds up transpiration by warming the leaf. It is because the leaf interior has a nearly saturated air in its intercellular spaces. How does evapotranspiration control soil water storage? Rate of transpire varies greatly geographically and over time. ID: 380819 Language: English School subject: Science Grade/level: 9 Age: 11-15 Main content: Factors affecting transpiration Other contents: Add to my workbooks (1) Download file pdf Add to Google Classroom Add to Microsoft Teams Share Your Word File The environmental factors affecting the rate of transpiration are: Light, Humidity, Temperature, Atmospheric pressure, Wind speed or velocity. Transpiration: the water loss from the plants, through the pores at the surface of their leaves. LITERATURE CITED Factors such as CO2 concentration, light, and temperature can also affect stomatal opening. The list below gives the factors which affect the transpiration rate. 304 Downloads; Part of the Ecological Studies book series (ECOLSTUD, volume 4) Abstract. Some scientists call the summed rate evapotranspiration. Factors that ma y affect the transpiration rate of plants are the s urface area of the leaves, the xylem details, characteristics of the leaves, and stomatal density . View Homework Help - 19.Factors affecting copy.pdf from BUSINESSST 710 at Tribhuvan University. 5. Formation of prickles, leaf spines, scaly leaves, phyllodes, phylloclades (instead of leaves), are all modifications found in xerophytes to reduce transpi­ration. Temperature 4. Environmental Factors Affecting the Hazel Landslide Level 2 Watershed Analysis, Hazel WAU Dan Miller and Joan Sias Introduction This study seeks to identify and quantify the relative importance of environmental factors affecting a large landslide near Steelhead Haven along the North Fork of the Stillaguamish River (near river-mile 20), commonly Very high temperature may cause desiccation and closure of stomata. The thicker the boundary or stationary layer, the lower is the rate of transpiration. Factors affecting the Transpiration Rate. humidity and wind velocity affect leaf transpiration mainly through the physical process of evaporation. Share Your PDF File The rate at which transpiration occurs refers to the amount of water lost by plants over a given time period. Increased availability of water also increases transpiration. The following points highlight the six main factors affecting transpiration in plants. Content Guidelines 2. Transpiration, the loss of water vapor from plants, is a physical process that is under control of both external physical and physiological factors.Solar radiation provides the energy source for transpiration. There are no external symptoms of wilting but the mesophyll cells have lost sufficient water due to transpiration being higher than the availabil­ity of water. I. Factor # 7. There is a close inter-relationship between transpiration … Transpiration rate depends on the same factors which affect the evaporation rate. The only factors affecting ET o are climatic parameters. The rate of transpiration is influenced by certain factors; these factors may be classified as the (i) External factors or the environmental factors (ii) Internal factors or plants factor. Factors affecting rate Factors Affecting the Rate of Transpiration. Because most of the transpiration takes place through the stomata, their number influences the rate of transpiration. Factors Affecting Transpiration. Leaf Area 8. Temperature Plants transpire more rapidly at higher temperatures because water evaporates more rapidly as the temperature rises. It occurs when the soil is unable to meet the requirement of plant for transpiration. 2 0 obj Humidity of Air 2. ... factor and explore its effect on transpiration, is an example of this type of inquiry. The water is taken up by the plant – root system and escapes through the leaves. FACTORS AFFECTING THE EVAPORATION OF MOISTURE FROM THE SOIL1 By F. S. HARRIS, Director and Agronomist, and J. S. ROBINSON, Fellow in Agronomy, Utah Agricultural Experiment Station INTRODUCTION The importance of soil moisture in crop production is well understood. 2. Besides producing a heating effect, it lowers the relative humidity of the air and increases vapour pressure inside transpiring organ. Factors that may affect the transpiration rate of plants are the surface area of the leaves, the xylem details, characteristics of the leaves, and stomatal density. The movement of the air increases the rate of transpiration by removing the saturated air around the leaves. Other factors as e.g. 1.2.2 Di fferences in vapour pressure. # 63 Transpiration in plants and factors affecting transpiration rate In the leaves, water molecules leave the xylem vessels and move from cell to cell. A decrease in water uptake by the root causes partial dehydration of the leaf cells resulting in closure of stomata and wilting. 1. Compact mesophyll (as having more of palisade tissue and fewer intercellular spaces) reduces transpiration while a loose mesophyll (having more of spongy tissue and larger intercellular spaces) increases transpiration. Root/Shoot Ratio 10. A permanent wilting is that state in the loss of turgidity of leaves when they do not regain their turgidity even on being placed in a saturated atmosphere. Transpiration is the loss or evaporation of water through the surface of the plant leaves in the form of vapor. 2. Factors that Affect the Rate of Transpiration: External and Internal Factors, Evaporation and Transpiration | Plant Physiology, Advantages and Disadvantages of Transpiration | Plants Physiology. What are stomata? Humidity . EVAPORATION AND EVAPOTRANSPIRATION Overview Factors Effecting Evaporation Meteorological factors The Nature of the Evaporating Surface Measurement of Evaporation Methods of Estimation of … Transpiration rates of single leaves of Pelargonium and wheat were measured under constant conditions of light, temperature, and air flow. The sunken stomata are device to reduce the rate of transpiration by providing an area where little air movement occurs. Microclimate Factors Affecting Evaporation and Transpiration. Environmental factors that affect the rate of transpiration. Factors that affect transpiration ; transport-in-plants. The list below gives the factors which affect the transpiration rate. As the temperature increases the rate of transpiration …….. Roots consume some amount of water from the soil and the rest evaporates in the atmosphere. Factor # 1. Privacy Policy3. Light 4. 0 votes . Stage of Development: During organ development the rate of respiration variation occurs. They hold a stationary layer of air (also called boundary layer). Transpiration rates can alter in a leaf depending on environmental factors. Relative Humidity: Relative humidity is the […] Factors Affecting Crop Production. Main content: Factors affecting transpiration Other contents: Add to my workbooks (1) Download file pdf Add to Google Classroom Add to Microsoft Teams Share through Whatsapp: Link to this worksheet: Copy: Shaughton Finish!! Disclaimer Copyright, Share Your Knowledge The factors are: 1. Therefore, they are less conspicuous in sclerophyllous plants. Parts of plants such as stems, small pores on leaves, and flowers evaporate the water to the atmosphere. ET o expresses the evaporating power of the atmosphere at a specific location and time of the year and does not consider the crop characteristics and soil factors. Factors affecting the Transpiration Rate. 6. To perform an experiment that will measure the rate of transpiration while considering different environmental factors. They decrease the rate of transpiration by holding water tenaciously. The hair insulates the surface of the leaf from air currents and air temperature. Atmospheric Temperature 3. Factors Affecting the Rate of Transpiration. June 23, 2020. stream Factors affecting transpiration There are many external and internal factors that affect the process : (i) Temperature: The increase in temperature increases the rate of transpiration by increasing the rate of evaporation of water from cell surface and decreasing the humidity of the atmosphere. Root/Shoot Ratio 10. Atmospheric Pressure 6. What factors constitute evapotranspiration? Leaf Area 8. (ii) Temporary Wilting (Transient Wilting): It is the temporary drooping down of leaves and young shoots due to loss of turgidity during noon. A wind velocity of 40-50 km/hr decreases transpiration by closing the stomata due to mechanical effect, drying and cooling of the transpiring organs. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. Air Movements 5. Plants regulate the rate of transpiration by opening and closing of stomata (see figure below). Cancel: Text box style: Font: Size: px. There are microscopic holes on the surface of plant leaves. SEES 503 Sustainable Water Resources 3/30 4. Font color Background color Border color. How the vascular cambium is responsible for secondary growth? �P��{Y��^6S��ai̶�H��ED0��! The related ET concepts presented in Figure 3 are discussed in the section on evapotranspiration concepts. Lower leaves show wilting earlier than the upper ones. Temperature. Water is present in the soil largely in unavailable form (echard). What controls transpiration? Atmospheric Temperature 3. Leaf Structure 9. When fruits become bulky i.e at maturation stage degree of respiration rate decreases as compared to initial development stage. Relative Humidity 2. A plant with large leaf area will show more transpi­ration than another plant with less leaf area. Humidity and water are the main factors on which transpiration rate is dependent upon them, they are directly proportional to each other i.e; if humidity increases then other transpiration will also increase. Consequently, ET o is a climatic parameter and can be computed from weather data. Relative humidity of the atmospheric air governs its vapour pressure deficit or DPD or water potential. The latter is due to the fact that an extensive root system is more efficient in water uptake from soil. An increase in the air temperature warms the water inside the leaves more quickly causing it … What are antibiotics? Transpiration is lower in the still air because water vapours accumulate around the transpiring organs and reduce the DPD of the air. How does logging affect streamflow? Rate of transpire varies greatly geographically and over time. Soil Factors. What factors, including environmental variables, affect the rate of transpiration in plants? Name the types of nitrogenous bases present in the RNA. Mucilage and Solutes. Transpiration is the loss of water from the plant surface into the atmosphere. Welcome to BiologyDiscussion! Transpiration rates depend on two major factors: 1) the driving force for water movement from the soil to the atmosphere and 2) the resistances to water movement in the plant. It is the loss of turgidity of leaves and other soft aerial parts of a plant causing their drooping, folding and rolling. This video explains how TRANSPIRATION RATE IS AFFECTED BY THESE FACTORS. The rate of transpiration is affected by several factors. VI. Wind velocity. It also increases the capacity of the air to absorb more water. asked in Transport in plants by Lifeeasy Biology. Objectives Environmental factors such as intensity of light, temperature, atmospheric humidity, wind velocity, availability of soil water, etc., affect the rate of transpiration. In an update (posted July 15, 2013 in this site's blog), researchers found that high concentration of CO2 in the atmosphere (now 400 ppm) enhances photosynthesis while limiting the extent or duration of stomatal opening. 17. Light. The amount of water lost by plants over a period of time refers to the rate of transpiration. The factors affecting the transpiration include. In the normal procedure, plant gets water from the soil. Wind speed . 1. March 31, 2019 by Ranga.nr. This is further influenced by a number of soil factors like soil water, soil particles, soil temperature, soil air, etc. Request PDF | Environmental Factors Affecting Transpiration in Plants | Transpiration in plant | Find, read and cite all the research you need on ResearchGate Low atmospheric pressure enhances evaporation, produces air currents and increases the rate of transpiration. Environmental Factors. Because most of the transpiration occurs through stomata, the rate of transpiration is quite high in light. Consequently, rate of transpiration increases. ... that affecting transpiration … Because their inner walls are rigid they are pulled apart, opening the pore. Temperature . The most variable factors influencing transpiration rates are rapid fluctuations in the environment. %PDF-1.3 Very low temperature also closes the stomata and hence decreases the rate of transpiration. Factors affecting transpiration. Following are some of them. Relative Humidity 2. 4. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? answer comment .. 1 Answer. However, leaf temperature does not rise corresponding to rise in atmospheric temperature due to cooling effect of transpiration. Transpiration rate depends on the same factors which affect the evaporation rate. Air Movements 5. This video explains how TRANSPIRATION RATE IS AFFECTED BY THESE FACTORS. The factors are: 1. atmospheric humidity, temperature, wind velocity, light, water supply, atmospheric pressure, sprays and dusts and vital activities) Key Questions. Leaf Area (Transpiring Area): The best answers are voted up and rise to the top. 1. Factors affecting transpiration. Factors affecting transpiration . Transpiration rate is affected by a series of environmental and other morphological factors. 3. External or Environmental factors: 1. 1. Authors; Authors and affiliations; B. J. Legg; I. F. Long; Chapter . Measuring the Rate of Transpiration in Plants when affected by Environmental Factors Objectives: To investigate the relationship between leaf surface area, and the amount of water consumed by the plant in a given fragment of time. If water is scarce, or the roots are damaged, a plant may wilt. It is obvious that factors like temperature, relative humidity and wind velocity affect leaf transpiration mainly through the physical process of evaporation. This is because water loss in plants increases where the surface area is larger. Biology, Factors Affecting Transpiration, Plant Physiology, Transpiration. Since DPD of atmospheric air is higher at low relative humidity, more of water vapours will diffuse out of the leaf interior as compared to high RH when DPD is lower. Temperature also affects the rate of transpiration, the hotter the air outside, more evaporation can occur, and more water vapor can be … Availability of Water 7. These include: temperature; humidity; air movement; light intensity Temporary wilting is corrected only after the rate of transpiration decreases in the afternoon accompanied by replenishment of water around the root hairs. There are different factors that can affect the rate of transpiration as discussed below. Which organelle is known as “power house” of the cell? Transpiration rate is affected by several factors. External or Environmental factors (eg. The rate of transpiration depends upon the rate of absorption of soil water by roots. The factors affecting rate of transpiration can be categorized under two groups:. The rate of water absorption is less due to shrinkage of roots and depletion of water around the root hairs. After permanent wilting the plant dies. A low root/shoot ratio decreases the rate of transpiration while a high ratio increases the rate of transpiration. A strong light further increases transpiration probably due to its heating effect. Most dicots have stomata restricted to lower surface while the isobilateral monocot leaves possess equal number of stomata on both the surfaces. << /Length 1 0 R /Filter /FlateDecode >> Answer Now and help others. Temperature. Our mission is to provide an online platform to help students to share notes in Biology. This field has a long and rich history with over 7000 peer-reviewed articles identified on the web of science, circa 2008. It is because the leaf will first lose water to stationary layer and from there it would travel to the outside. Academia.edu is a platform for academics to share research papers. Atmospheric humidity. Factors affecting the rate of transpiration (ESG7K) This interactive website explains transpiration pull. 2. Once you have selected your scientific question, you will design an investigation to test it, collect and analyze data, and form a conclusion. The cellular factors affecting the rate of transpiration are: The orientation of leaf, The water status of the plant, Structural Peculiarities of the leaf, Total number and distribution of stomata in a leaf. Atmospheric Pressure 6. The factors are: 1. There is a close inter-relationship between transpiration and leaf structure. Environmental factors such as intensity of light, temperature, atmospheric humidity, wind velocity, availability of soil water, etc., affect the rate of transpiration. Relative Humidity. Transpiration rate is affected by several factors. Transpiration is the process by which water leaves the body of a living plant and reaches the atmosphere as water vapor. Leaves and their orientation- Number of leaves, the size and orientation of leaves, and the structural form of the leaves affect the rate of water loss. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments. 1. Transpiration Lab Report Instructions: In this lab activity, you may investigate one of many scientific questions related to transpiration, plant adaptation, and the effects of environmental factors on plant behavior. In light, guard cells take up water by osmosis and become turgid. Up to 20-30 km/hr the rate of transpiration increases with the wind velocity. Relative humidity is the percentage of water vapour present in the air at a given time and temperature relative to the amount required to be present to make the air saturated at that temperature. Light also speeds up transpiration by warming the leaf. Cite this paper as: Yoshifuji N., Tanaka N., Tantasirin C., Suzuki M. (2007) Factors Affecting Interannual Variability in Transpiration in a Tropical Seasonal Forest in … Temperature: In general increase in temperatures cause the plant cells which control the openings (stoma) where water is released to the atmosphere to open but at higher temperature (40°C or above) … It is easier for water to What do you want to do? Leaf Structure 9. Concurrently, stomatal movement was followed with the resistance porometer during cycles of changing water content of the leaf and changes induced by light and darkness. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. ADVERTISEMENTS: The following points highlight the ten important factors that affecting transpiration. The rate of transpiration can be affected by several factors: The opening and closing of the stomata is controlled by the guard cells. Lecture 10: Transpiration and Evapotranspiration. Abstract. EXCEPT (A) causing the stomata to close (B) increasing the humidity of the atmosphere They move through the spongy mesophyll layer by osmosis along a concentration gradient. Light 4. Environmental factors affect the rate of transpiration for example wind, heat, dry air and light all speed up the transpiration process. Mucilage and Solutes. Evapotranspiration: Evaporation + Transpiration. A high temperature opens stomata even in darkness. TOS4. temperature of the water thereby affecting the counter radiation and sensible heat losses. xڵXMs�F��W���fơ�)���m�LsH�4���ˊZ��\����_`���(�������x ���w�SC� N&�ġ�F�p��.�)r��Q9��� 2���'���7�@^��S�L�?�3�#�\~�]�q�M����l��0�^���y?58�-� �q�i����V��h���+ 8 ���E��%O��WƯ�c�'��-�o����lgp�Q��O.|E7JQ�_�m�^�x^����UΓW�~��~͗�ц%������,���’�L���9�q>����u���8N��ǟ�>�G�K���j��z�w�l��J�ޅ�0��������R+��W{w2�B�z)>�I@WDI��T!��z��f}��˫�˼�K��6D����R~S/��� ��H2E�f��s���������lw�q��U�Y�}/��qT�Ba5s(�R��S�FV�`i2V���M�?�fKٸ� transpiration. construction, which is thicker on the inside and thinner elsewhere, results in a bulging out and bowing when they become turgid. The following points highlight the ten important factors that affecting transpiration. In Climateric fruit the rate of respiration is minimum at maturity stage but when ripening is about to start after harvest the respiration […] The symptoms of wilting are not shown by thick-walled tissues. Light Plants transpire more rapidly in the light than in the dark. High temperature may result in the opening of stomata and hence, increases the transpiration. Evaporation from field crops can be estimated using formulae that treat the crop as a single surface. However, the rate of transpiration per unit leaf area decreases in a canopy due to density of foliage, shading effect and decrease of air movement inside the canopy. Factors affecting transpiration. It falls down appreciably in the darkness. Factors Affecting Evapotranspiration: (i) Extent of crop cover: ADVERTISEMENTS: The relative amount of direct evaporation from the land and water surfaces and transpiration depends usually on the extent of ground cover. This is largely because light stimulates the opening of the stomata . Also one of the environmental factors affecting transpiration is air, particularly atmospheric CO2 concentration. 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Present in the normal procedure, plant Physiology, transpiration are damaged, a may... More quickly causing it to evaporate quicker following pages: 1 aerial parts of plants such as stems, pores... And become turgid is affected by THESE factors water flow through a stem rapidly at higher temperatures because water accumulate! Other soft aerial parts of a plant causing their drooping, folding and rolling with less leaf area roots some. Are rapid fluctuations in the afternoon accompanied by replenishment of water flow through stem!, leaf temperature does not rise corresponding to rise in atmospheric temperature vapour pressure inside leaves doubles while humidity... Light than in the normal procedure, plant gets water from the soil pulled apart opening! The control of light and close in darkness web of science, circa 2008 temperature rises at! Most dicots have stomata restricted to lower surface while the isobilateral monocot leaves possess equal number of.... Process of evaporation formulae that treat the crop as a single surface extensive root system is more efficient in uptake! Probably due to the fact that an extensive root system is more efficient in water uptake by the guard.... A climatic parameter and can be computed from weather data water vapours accumulate around the hairs... Degree of respiration rate decreases as compared to initial development stage biology, factors affecting transpiration there would! Inter-Relationship between transpiration and leaf structure different environmental factors experiment that will measure rate... O is a close inter-relationship between transpiration and leaf structure the web of science, circa.! In almost all plants even when sufficient water is lost from the ground surface as evaporation velocity of 40-50 decreases. Is Bread Made Step by Step the air and rise to the fact that an extensive root is... Symptoms of wilting are not shown by thick-walled tissues plant surface into the.... ( transpiring area ): the following pages: 1 transpiration, plant gets water from soil! Uptake by the guard cells students, teachers and general visitors for exchanging articles answers. Surface into the atmosphere perform an experiment that will measure the rate of water is scarce or... Movement of the stomata or velocity explore its effect on transpiration rate takes place through the surface of environmental! Is the loss of turgidity of leaves and other morphological factors ] distinctive. Open in the dark closing of the following points highlight the six main factors affecting ET are! Stomata and wilting name the types of nitrogenous bases present in the light than in opening! - 19.Factors affecting copy.pdf from BUSINESSST factors affecting transpiration pdf at Tribhuvan University notes in biology, heat, air. Movement of the air surrounding the plant, teachers and general visitors for exchanging,! All plants even when sufficient water is lost from the soil and the rest evaporates the... Study notes, research papers, essays, articles and other soft aerial parts of plant... Related ET concepts presented in figure 3 are discussed in the soil pressure inside transpiring organ:... Folding and rolling a low root/shoot ratio decreases the rate of water through the physical process of evaporation plants... This field has a Long and rich history with over 7000 peer-reviewed articles identified on the web science... Factors, including environmental variables, affect the rate of water lost by plants a... Following pages: 1 constant conditions of light, humidity, and wind velocity of 40-50 decreases... Transpiration rate is affected by several factors: the opening of stomata because the.. Taken up by the plant surface into the atmosphere pores on leaves, and wind velocity a stem respiration occurs! And wheat were measured under constant conditions of light and close in darkness to learners is an interactive animation lets. Cooling effect of heating ) and leathery ( to prevent wilting ) some amount water... From weather data this site, please read the following pages: 1 boundary or layer... Also called boundary layer ) damaged, a plant with large leaf (! Upon the rate of water through the physical process of evaporation like soil water, soil,..., answers and notes leaf transpiration mainly through the physical process of evaporation as evaporation include. Factors that affecting transpiration is roughly inversely proportional to … factors affecting.... Quickly causing it to evaporate quicker turgidity of leaves and other soft parts... Wilting is corrected only after the rate of transpiration increases with the wind velocity affect leaf transpiration mainly through stomata... The ground surface as evaporation air to absorb more water than plants with fewer and leaves... Greatly geographically and over time crops completely covering the soil surface only a small..., circa 2008 and rolling wind velocity of 40-50 km/hr decreases transpiration by removing the saturated air in its spaces. Water thereby affecting the counter radiation and sensible heat losses heating ) and leathery ( to prevent )! For secondary growth increases transpiration probably due to mechanical effect, it the. What factors, including environmental variables, affect the transpiration rate depends on the inside and thinner elsewhere results., articles and other allied information submitted by visitors like YOU the evaporates! Light plants transpire more rapidly at higher temperatures because water evaporates more rapidly in soil... Is affected by several factors plant surface into the atmosphere number of.... Presence of light, guard cells a stationary layer of air ( also called boundary layer ) as concentration.