THREE TEMPERTURE (3T) MODEL—A METHOD TO ESTIMATE EVAPOTRANSPIRATION AND EVALUATE ENVIRONMENTAL QUALITY BASED ON SURFACE TEMPERATURE. IV. PLANT TRANSPIRATION TRANSFER COEFFICIENT

doi:10.17521/cjpe.2006.0108

Abstract

Abstract:

Background and Aims Vegetation transpiration rate sensitively responses to environmental stress introduced by air pollution, environmental degradation (soil and water), and global change. Based on energy balance analysis, by introducing the temperature of a canopy without transpiration, the objectives of this study are to propose a remotely measurable plant transpiration transfer coefficient (h_at) and to verify its characteristics under various environmental conditions.

Methods The h_at is defined as (T_c-T_a)/(T_p-T_a), where T_c, T_p, and T_a are temperatures of vegetation canopy, a non-transpiring canopy, and air, respectively. Five experiments were carried out to verify the proposed coefficient.

Key Results Theoretical analysis and experimental results show h_at≤1. IfT_c=T_p, h_at has its maximum value (h_at = 1) and transpiration rate has its minimum value (zero). This boundary is determined by lack of water for transpiration. On the other hand, when h_at has a minimum value, transpiration can reach its maximum value (potential transpiration rate). This boundary is determined by the availability of energy for transpiration.

Conclusions Therefore, h_at can determine transpiration rate from its minimum value to its maximum value. A lower value of h_at corresponds to a higher transpiration rate.

Key words: Environmental quality, Plant transpiration transfer coefficient, Remote sensing, Three temperatures model, Transpiration

QIU Guo-Yu, WU Xiao, WANG Shuai, SONG Xian-Fang. THREE TEMPERTURE (3T) MODEL—A METHOD TO ESTIMATE EVAPOTRANSPIRATION AND EVALUATE ENVIRONMENTAL QUALITY BASED ON SURFACE TEMPERATURE. IV. PLANT TRANSPIRATION TRANSFER COEFFICIENT[J]. Chin J Plant Ecol, 2006, 30(5): 852-860.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2006.0108

https://www.plant-ecology.com/EN/Y2006/V30/I5/852

Figures/Tables 5

Fig.1 Relationship between plant transpiration transfer coefficient (hat) and the ratio of sensible heat fluxes (H/Hp) of sorghum plants in an open field (Experiment 1)

Fig.2 Transpiration rate (a), temperature of non-transpiring leaf, canopy and air (b), and plant transpiration transfer coefficient (hat) (c) in hydroponically grown tomato plants during the 3-day drying period (May 7-9, 1997)

Fig.3 Transpiration rate (a), temperature of non-transpiring leaf, canopy and air (b), and plant transpiration transfer coefficient (hat) (c) in potted (soil cultivated) tomato plants during the 3-day drying period (May 24-26, 1997)

Fig.4 Solar radiation (a), volumetric soil water content (θ)(b), temperature of non-transpiring leaf, canopy and air (c), and plant transpiration transfer coefficient (hat) (d) in melon plants grown in a glasshouse in June-July 1998

Fig.5 Comparisons of solar radiation (a), relative humidity (b), volumetric soil water content (θ)(5c), transpiration rate (d), temperature of non-transpiring leaf, canopy and air (e), and plant transpiration transfer coefficient (hat) (f) in potted (soil cultivated) tomato plants during the 4-day drying period (May 21-23, 1999)

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