The need for a common basis for defining light-use efficiency: Implications for productivity estimation

REMOTE SENSING OF ENVIRONMENT

卷:156

Article

Gitelson, Anatoly A.^1,2  Gamon, John A.^1,3,4 

[1] Univ Nebraska, Sch Nat Resources, Lincoln, NE 68588 USA

[2] Technion Israel Inst Technol, Fac Civil & Environm Engn, IL-32000 Haifa, Israel

[3] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2M7, Canada

[4] Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2M7, Canada

关键词: Absorbed radiation;    Light use efficiency;    Gross primary production;   

DOI  :  10.1016/j.rse.2014.09.017

来源: Elsevier

【 摘 要 】

A primary focus of this short communication is to show how the operational definition of light use efficiency (LUE) influences the results and interpretation of the LUE model. Our study was motivated by the observation that multiple LUE definitions are reported in the literature. The temporal behavior of three operational definitions of LUE, based on (i) incident radiation, (ii) total absorbed radiation and (iii) radiation absorbed by photosynthetically active/green vegetation was examined for two contrasting crops (soybean and maize) having different physiologies, leaf structures and canopy architectures. Over the course of a growing season, the behavior of these three contrasting LUE definitions was strikingly dissimilar, and the degree of dissimilarity varied with contrasting crops (corn and soybean). This demonstrates that LUE model behavior would vary strongly with the LUE definition used, with resulting implications both for the estimated seasonal productivity, and for the interpretation of the underlying mechanism. Based on these findings, we recommend a standard definition of the LUE model based on radiation absorbed by green vegetation. We also discuss the practical and theoretical implications of using this simple conceptual model on a dynamic biological system. (C) 2014 Elsevier Inc. All rights reserved.

【 授权许可】

Free