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Differences of Stem CO2 Efflux Among Individual Trees of Schima superba and Effects of Sap Flow

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Author:: No author available

Journal Title:: Chinese Journal of Applied & Environmental Biology

Issue:: 4

DOI:: No doi available

Key Word:: 荷木;树干CO2释放通量;树干温度;液流速度;Q10

Abstract：为研究荷木(Schima superba)个体间树干CO2释放通量(Es)的差异以及树干液流对Es的影响,提高森林生态系统呼吸计算准确性,利用红外气体分析仪及自制式气室于2009年湿季和干季监测了华南荷木人工林5棵样树的Es,并同步监测了树干温度(θs)、气温及液流密度.结果显示:θs与气温之间呈显著线形正相关；Es与树干温度之间存在显著指数函数关系；Es干湿季的差异显著,并呈现明显的季节变化；5株样树之间Es存在显著差异,平均Es分别为3.12、3.60、5.52、6.98、8.09 μmol m-2 s-1；同时,样树之间树干CO2释放通量的温度系数(Q10)差异显著(1.97～4.24之间)Tree1、Tree2和Tree4白天的Es与液流速度(v)显著正相关,白天的标准化树干CO2释放通量(R25,温度为25℃时的Es)高于晚上.荷木Es个体之间及时间上的差异主要受树干温度、生长状况和液流速度的影响.

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