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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

ISSN号：1006-687X
期刊名称：《应用与环境生物学报》
时间：0
分类：Q945.19[生物学—植物学]
作者机构：[1]中国科学院华南植物园,广州510650, [2]中国科学院研究生院,北京100049
相关基金：国家自然科学基金项目（Nos.30770328,30871998,41030638）和广东省自然科学基金项目（No.07006917）资助

作者：朱丽薇[1,2], 赵平[1], 倪广艳[1], 蔡锡安[1], 曾小平[1], 邹绿柳[1,2], 梅婷婷[1,2], 余孟好[1,2]

关键词：荷木, 树干CO2释放通量, 树干温度, 液流速度, Q10, Schima superba, stem COs efflux, stem temperature, sap flow velocity, Q10

中文摘要：

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CO，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E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E．个体之间及时问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

英文摘要：

The differences of stem CO2 efflux （E） among individual trees and effects of sap flow on Es have affected the accuracy when calculating the respiration of a forest ecosystem. In a Schima superba plantation forest in southern China, infrared gas analyzer and self-made chamber were applied to measure the stern CO2 efflux of five sampled trees, with stem temperature （0）, air temperature and sap flow density recorded synchronously in wet and dry seasons in 2009. The results showed that θs was positively linear-correlated to air temperature, while Es was exponentially related to θs. Es was found significantly different between July and October, indicating a clear seasonal variation. E was significantly different among 5 sampled trees, and mean E were 3.12, 3.60, 5.52, 6.98 and 8.09 μmol m^-2 s^-1, respectively. In the meantime, Q10 also significantly differed among the sampled tree individuals ranging from 1.97 to 4.24. Es of Treel, Tree2 and Tree4 had a significant correlation with sap flow velocity at daytime, which resulted in higher standardized stem CO2 efflux （R2s, Es at 25℃） than that at night. Both the variation of Es among the individual S. superba, and the E changes based on the timing of measurements can mainly be explained with stem temperature, growth status and sap flow velocity. Fig 3, Tab 6, Ref 35

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