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典型沙生灌木生态系统凝结水量估算

郭晓楠 查天山 杨强 穆家伟 刘鹏

郭晓楠, 查天山, 贾, 昕, 杨强, 穆家伟, 刘鹏. 典型沙生灌木生态系统凝结水量估算[J]. 北京林业大学学报, 2016, 38(10): 80-87. doi: 10.13332/j.1000-1522.20160017
引用本文: 郭晓楠, 查天山, 贾, 昕, 杨强, 穆家伟, 刘鹏. 典型沙生灌木生态系统凝结水量估算[J]. 北京林业大学学报, 2016, 38(10): 80-87. doi: 10.13332/j.1000-1522.20160017
GUO Xiao-nan, ZHA Tian-shan, JIA Xin, YANG Qiang, MU Jia-wei, LIU Peng, .. Estimation of dewfall amount in a typical desert shrub ecosystem.[J]. Journal of Beijing Forestry University, 2016, 38(10): 80-87. doi: 10.13332/j.1000-1522.20160017
Citation: GUO Xiao-nan, ZHA Tian-shan, JIA Xin, YANG Qiang, MU Jia-wei, LIU Peng, .. Estimation of dewfall amount in a typical desert shrub ecosystem.[J]. Journal of Beijing Forestry University, 2016, 38(10): 80-87. doi: 10.13332/j.1000-1522.20160017

典型沙生灌木生态系统凝结水量估算

doi: 10.13332/j.1000-1522.20160017
基金项目: 

国家自然科学基金项目(31270755)、国际(地区)合作与交流项目(NSFC-AF项目(中芬))(31361130340)。

详细信息
    作者简介:

    郭晓楠,博士生。主要研究方向:生态水文。 Email:littlepondGXN@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: 查天山,教授,博士生导师。主要研究方向:生态系统过程、植被对气候变化的响应与反馈、植被间相互作用等。Email:tianshanzha@bjfu.edu.cn 地址:同上。

    郭晓楠,博士生。主要研究方向:生态水文。 Email:littlepondGXN@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: 查天山,教授,博士生导师。主要研究方向:生态系统过程、植被对气候变化的响应与反馈、植被间相互作用等。Email:tianshanzha@bjfu.edu.cn 地址:同上。

Estimation of dewfall amount in a typical desert shrub ecosystem.

  • 摘要: 当前对干旱半干旱过渡带生态系统凝结水量的估算及其年际变化的认识仍十分有限。本研究以宁夏盐池沙生灌木生态系统为对象,运用微型蒸渗仪、涡度相关(eddy covariance,EC)法和Penman-Monteith公式对凝结水进行测定和估算,以求探索涡度相关法和Penman-Monteith公式估算凝结水的准确性,并且分析凝结水季节和年际变化、其对生态系统水量平衡的贡献及降雨对凝结水的影响。结果表明:1)以微型蒸渗仪观测结果为对照标准,涡度相关法因在夜间存在严重的能量不闭合会造成凝结水严重低估,而Penman-Monteith公式可以较准确地估算凝结水量(R2 =0.94,P0.05);2)采用Penman-Monteith公式估算2012—2014年凝结水,日平均凝结水量为0.14±0.08 mm,年平均凝结水发生天数为259 d/a,估算2012—2014年凝结水年总量分别为46、33和29 mm。凝结水多发生在夏秋季。2012—2014年降雨年平均量为301 mm。凝结水年均总量是平均降雨总量的12%。3)降雨时与降雨后一天凝结水成显著正相关关系(R2=0.81, P0.05)。2012—2014年≥20 mm的降雨次数占全年总降雨次数百分比分别为10%、5%和3%,≥20 mm的降雨能够为空气提供较多水分,增加凝结水量。因此≥20 mm降雨次数占全年总降雨次数的百分比将显著影响当年凝结水总量。结果证实,虽然凝结水总量年际差异较大且占降雨的百分比较小,凝结水是维持荒漠生态系统功能的重要稳定水源。

     

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出版历程
  • 收稿日期:  2016-01-15
  • 刊出日期:  2016-10-29

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