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地理科学  2008 

天目山柳杉树轮δ13C序列所反映的植物水分利用率对大气CO2浓度变化的生理响应

, PP. 698-702

Keywords: 树轮,δ13C,大气CO2浓度,生理响应

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Abstract:

工业化以来,由于大量化石燃料CO2排入大气,引起大气CO2浓度的持续升高。研究表明,植物的光合作用、水分利用率及作物生物量等均对周围大气CO2浓度的增加产生明显的正响应,而植物叶片的气孔导度及蒸腾速率对CO2浓度增加产生负响应。对采自浙江西天目山地区的三株柳杉树盘交叉定年后,测定了三株树轮的δ13C年序列,并利用3株柳杉树轮δ13C序列探讨了天目山地区树木生长对大气CO2浓度增加的生理响应——水分利用率的变化状况。结果是,三株树轮δ13C序列反映的水分利用率均是增加的,且增长趋势基本一致。研究结果反映了工业革命前后,树木生长对大气CO2浓度增加所产生的明显正响应。

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