江河源区植被水分利用效率遥感估算及动态变化

为了获取高寒地区在资料短缺条件下的陆地生态系统碳循环和水循环的变化特征,该文以遥感数据、气象数据和实际观测数据相结合,利用基于光能利用率的CASA(carnegie ames stanford approach)模型和FAO Penman-Monteith方法对江河源区2000–2010年植被水分利用效率进行估算和动态分析,得出以下结论:1)所选模型较好的反应了区域植被水分利用效率的时空分布特征。近11 a来,长江源区和黄河源区多年平均水分利用效率(以C质量计,下同)分别为0.54 g/(mm·m~2)和0.56 g/(mm·m~2),江河源区植被水分利用效率呈减少趋势,其中黄河源区植被水分效...

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Published in农业工程学报 Vol. 29; no. 18; pp. 146 - 155
Main Author 张春敏 梁川 龙训建 卫仁娟
Format Journal Article
LanguageChinese
Published 四川大学 水利水电学院水力学与山区河流开发保护国家重点实验室,成都,610065%西南大学 资源环境学院 重庆 400715 2013
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.18.018

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Summary:为了获取高寒地区在资料短缺条件下的陆地生态系统碳循环和水循环的变化特征,该文以遥感数据、气象数据和实际观测数据相结合,利用基于光能利用率的CASA(carnegie ames stanford approach)模型和FAO Penman-Monteith方法对江河源区2000–2010年植被水分利用效率进行估算和动态分析,得出以下结论:1)所选模型较好的反应了区域植被水分利用效率的时空分布特征。近11 a来,长江源区和黄河源区多年平均水分利用效率(以C质量计,下同)分别为0.54 g/(mm·m~2)和0.56 g/(mm·m~2),江河源区植被水分利用效率呈减少趋势,其中黄河源区植被水分效率减少速度大于长江源区。2)江河源区典型高寒草甸和高寒草原水分利用效率年际变化总体呈下降趋势,其中黄河源区减少趋势较长江源区更明显。长江源区高寒草甸和高寒草原水分利用效率呈现明显单峰现象,黄河源区呈现为阶梯增加和减少现象,表明长江源区在单位面积上植物消耗单位水分的固碳能力要好于黄河源区。3)主成分分析表明:江河源区植被水分利用效率变化与NDVI、温度、降水、太阳辐射以及蒸发密切相关;长江源区以NDVI、降雨为主导,黄河源区以NDVI、降雨和温度为主导。该研究可为江河源区水资源合理利用,实现区域生态环境可持续发展提供科学参考。
Bibliography:11-2047/S
Zhang Chunmin, Liang Chuan, Long Xunjian, Wei Renjuan (1. College of water resource and Hydropower, State Key Library of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China; 2. College of Resources and Environment, Southwest University, Chongqing 400715, China)
remote sensing, estimation, vegetation, water use efficiency, dynamic change, yangtze and yellow river headwater region
The alteration of water and carbon cycles can produce great influence on the terrestrial ecosystem, as far as to the whole earth. Vegetation water use efficiency (WUE) is the important variable on the contact of a carbon cycle and hydrological cycle in the vegetation ecosystem. In addition, study of vegetation WUE, in Yangtze and Yellow River Headwater Region, can provide important support for region ecological environment development. Therefore, in order to obtain the change characteristics of the hydrologic and carbon cycle within the terrestrial ecosystem under a data shortage condition, this
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.18.018