Light use efficiency (LUE) is defined as the ratio of primary production and absorbed light energy by vegetation canopy. The quantifying modeling of primary production is based on the quantifying modeling of LUE. A light use efficiency model developed from eddy covariance (EC) measurements, called EC-LUE, was used to model LUE of alpine meadows on Northern Tibetan Plateau in 2004-2005. The EC-LUE is driven by evaporative fraction (EF) and air temperature (Ta). EF and Ta were the water attenuation scalar (Wscalar) and temperature attenuation scalar (Tscalar) of maximum light use efficiency (LUEmax), respectively. In this study, LUEmax was set to be 0.85 g C/MJ. The integrated attenuation effect of Tscalar and Wscalar on LUEmax could be multiplied or following the Liebig's law. The LUE values simulated by the two approaches were labeled by LUEmultipEC and LUEminEC. The LUE derived from eddy covariance measurements was labeled by LUEEC. The LUEminECwas significantly larger than LUEEC, but the difference between LUEEC and LUEmultipEC was not significant. LUEmultipEC and LUEminEC explained both significantly above 89% seasonal changes of LUEEC. EF significantly explained soil water content (SW) at the depths of 0.05 m and 0.10 m, and specific humidity. Besides, EF also explained relative humidity to some extent. Compared to Wscalar, Tscalar might explain more seasonal variations of LUE based on correlation analysis and multiple stepwise linear regression analysis. Therefore, EC-LUE model could quantify the seasonal change of LUE and EF could quantify the seasonal change of environmental water for alpine meadows.
FU Gang, SHEN Zhen-xi, ZHANG Xian-zhou, SHI Pei-li, HE Yong-tao, SUN Wei, WU Jian-shuang, ZHOU Yu-ting
. Modeling Light Use Efficiency of an Alpine Meadow on Northern Tibetan Plateau Using Evaporative Fraction and Air Temperature[J]. JOURNAL OF NATURAL RESOURCES, 2012
, 27(3)
: 450
-459
.
DOI: 10.11849/zrzyxb.2012.03.011
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