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OALib Journal期刊
ISSN: 2333-9721
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荷木树干co2释放通量的个体间差异及树干液流的效应
DOI: 10.3724/SP.J.1145.2011.00447, PP. 447-452
Keywords: 荷木,树干co2释放通量,树干温度,液流速度,q10
Abstract:
为研究荷木（schimasuperba）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、8.09μmolm-2s-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.图3表6参35
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