Biophysical Controls on Light Response of Net CO2 Exchange in a Winter Wheat Field in the North China Plain

Xiaojuan Tong, Jun Li, Qiang Yu and Zhonghui Lin

PLOS ONE, 2014, vol. 9, issue 2, 1-13

Abstract: To investigate the impacts of biophysical factors on light response of net ecosystem exchange (NEE), CO2 flux was measured using the eddy covariance technique in a winter wheat field in the North China Plain from 2003 to 2006. A rectangular hyperbolic function was used to describe NEE light response. Maximum photosynthetic capacity (Pmax) was 46.6±4.0 µmol CO2 m−2 s−1 and initial light use efficiency (α) 0.059±0.006 µmol µmol−1 in April−May, two or three times as high as those in March. Stepwise multiple linear regressions showed that Pmax increased with the increase in leaf area index (LAI), canopy conductance (gc) and air temperature (Ta) but declined with increasing vapor pressure deficit (VPD) (P 25°C or VPD>1.1−1.3 kPa, NEE residual increased with the increase in Ta and VPD (P

Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0089469

DOI: 10.1371/journal.pone.0089469

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