季节性干旱对千烟洲人工林水分利用效率的影响

doi:10.11707/j.1001-7488.20141204

Abstract

Abstract:

Data from the eddy covariance measurements in Qianyanzhou plantation forest in ChinaFLUX (2003-2008) and a process-based model (EALCO) were applied to estimate of gross primary production (GPP), evapotranspiration (ET) and canopy stomatal conductance at the ecosystem level. In terms of water use efficiency (WUE), intrinsic water use efficiency (WUE_i) and inherent water use efficiency (IWUE), the effects of seasonal drought on the coupling of carbon and water were investigated. The results showed that for the short-term response to drought, WUE decreased during drought. There were no obvious effects of drought on annual WUE. However, annual WUE was significantly correlated with solar radiation (r=-0.903,P=0.014). In response to the short-term drought, the WUE_i and IWUE increased, which suggested that the weighted average concentration of intercellular carbon dioxide through the canopy and within the tower footprint reduced in drought occurrence with a constant atmospheric CO₂ concentration. WUE_i increased sharply when REW(relative extractable soil water) dropped below 0.4, thus REW=0.4 might be taken as a threshold to identify WUE_i under drought stress. Compared to WUE, IWUE and WUE_i are more appropriate for describing the biochemical functions of vascular plants and should be applied more in the future research.

Key words: water use efficiency, inherent water use efficiency, inherent water use efficiency, relative extractable soil water, drought stress

CLC Number:

S718.43

Mi Na, Wen Xuefa, Cai Fu, Wang Yang, Zhang Yushu. Effects of Seasonal Drought on the Water Use Efficiency of Qianyanzhou Plantation[J]. Scientia Silvae Sinicae, 2014, 50(12): 24-31.

References

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Effects of Seasonal Drought on the Water Use Efficiency of Qianyanzhou Plantation

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