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北京山区栓皮栎林水分来源及生长季动态规律

刘自强 余新晓 娄源海 贾剑波 贾国栋 路伟伟

刘自强, 余新晓, 娄源海, 贾剑波, 贾国栋, 路伟伟. 北京山区栓皮栎林水分来源及生长季动态规律[J]. 北京林业大学学报, 2016, 38(7): 40-47. doi: 10.13332/j.1000-1522.20150514
引用本文: 刘自强, 余新晓, 娄源海, 贾剑波, 贾国栋, 路伟伟. 北京山区栓皮栎林水分来源及生长季动态规律[J]. 北京林业大学学报, 2016, 38(7): 40-47. doi: 10.13332/j.1000-1522.20150514
LIU Zi-qiang, YU Xin-xiao, LOU Yuan-hai, JIA Jian-bo, JIA Guo-dong, LU Wei-wei.. Water use strategy of Quercus variabilis in Beijing mountainous area.[J]. Journal of Beijing Forestry University, 2016, 38(7): 40-47. doi: 10.13332/j.1000-1522.20150514
Citation: LIU Zi-qiang, YU Xin-xiao, LOU Yuan-hai, JIA Jian-bo, JIA Guo-dong, LU Wei-wei.. Water use strategy of Quercus variabilis in Beijing mountainous area.[J]. Journal of Beijing Forestry University, 2016, 38(7): 40-47. doi: 10.13332/j.1000-1522.20150514

北京山区栓皮栎林水分来源及生长季动态规律

doi: 10.13332/j.1000-1522.20150514
基金项目: 

青年科学基金项目(41401013)、国家自然科学基金面上项目(41430747)。

详细信息
    作者简介:

    刘自强。主要研究方向:森林水文、同位素水文。Email:liuzistrong@163.com地址:100083北京市海淀区清华东路35号北京林业大学水土保持学院。责任作者:余新晓,教授,博士生导师。主要研究方向:森林水文、水土保持。Email:yuxinxiao1111@126.com地址:同上。

    刘自强。主要研究方向:森林水文、同位素水文。Email:liuzistrong@163.com地址:100083北京市海淀区清华东路35号北京林业大学水土保持学院。责任作者:余新晓,教授,博士生导师。主要研究方向:森林水文、水土保持。Email:yuxinxiao1111@126.com地址:同上。

Water use strategy of Quercus variabilis in Beijing mountainous area.

  • 摘要: 栓皮栎是北京山区分布范围较广的典型阔叶树种,揭示其在生长季内不同土壤水分条件下的水分利用策略具有重要意义。本研究通过测定分析生长季内栓皮栎枝条水、土壤水和地下水的D和18O值,并利用多元混合模型(Iso-source软件)计算栓皮栎对土壤水或地下水的利用比例,再结合叶片水势、气孔导度(Gs)、光合速率(Pn)和蒸腾速率(Tr)等生理生态因子同步观测,了解北京山区优势乔木树种栓皮栎在生长季内的水分来源及生理生态适应。结果表明:栓皮栎对不同深度土壤水分利用比例具有季节变化特征,46月,栓皮栎主要利用表层0~30 cm土壤水、深层80~100 cm土壤水和地下水,且对3者的水分利用较为均衡;进入78月,栓皮栎的水分来源从表层土壤水逐步转向深层土壤水和地下水,对表层的土壤水利用较少;雨季过后进入降雨较少的910月,栓皮栎的水分来源又从深层土壤水和地下水逐步转向表层土壤水。生长季内土壤水分的季节波动明显影响栓皮栎的叶片气体交换过程,林地水土条件较好时,栓皮栎较高的气孔导度使其水分利用效率较低;当林地水分条件变差,栓皮栎能通过降低气孔导度减少水分损失来获得较高的碳同化速率,维持较高的水分利用效率来适应干旱生境,表现出较强的适应能力。

     

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