国立研究開発法人 国際農林水産業研究センター | JIRCAS

Theoretical Analysis and Experimental Verification of a Remotely Measurable Plant Transpiration Transfer Coefficient

JARQ : Japan Agricultural Research Quarterly
ISSN
00213551
書誌レコードID(総合目録DB)
AA0068709X
本文フルテキスト

The objectives of this study are to propose a remotely measurable plant transpiration transfer coefficient (hat) and to verify its characteristics under various environmental conditions. The hat is defined as (Tc - Ta) / (Tp - Ta), where Tc, Tp, and Ta are the temperatures of the canopy, a non-transpiring canopy, and air, respectively. Theoretically, hat ≦ 1, and determines transpiration from its minimum value (zero) to its maximum value (potential transpiration rate). Five experiments were conducted between 1994 and 1999 to verify the characteristics of hat, using 3 plant species (sorghum, tomato and melon). Theoretical validation showed that the proposed model agreed well with conventional models. Experimental results showed that the hat value was approximately equal to the value of the ratio of sensible heat fluxes (H/Hp), and the slope of the regression line between them was close to 1, the intercept was close to 0, and the regression coefficient was r2 = 0.70. In addition, hat was not only an indicator of the water status in the plant root zone, but also an indicator of atmospheric variables. Under waterstressed conditions, hat was affected mainly by the water status in the plant root zone. Therefore, hat can be used as an indicator of plant water stress. The main advantages are that hat can be easily measured and applied under various conditions. Due to its simplicity, hat is a suitable coefficient for analyzing the process of transpiration and for determining the transpiration rate.

刊行年月2003-07-01
作成者QIU Guo YuSASE SadanoriSHI PeijunDING Guodong
著者キーワード

remote sensing

sensible heat flux

surface temperature

公開者Japan International Research Center for Agricultural Sciences
データ作成日2003-07-01
国立情報学研究所メタデータ主題語彙集(資源タイプ)Journal Article
37
3
開始ページ141
終了ページ149
DOI10.6090/jarq.37.141
権利Japan International Research Center for Agricultural Sciences
言語eng