生态环境学报2016，Vol.25Issue(8)：1259-1263,5.DOI:10.16258/j.cnki.1674-5906.2016.08.001
藏北高原高寒草甸水分利用效率与环境温湿度的关系
Relationships between Water Use Efficiency and Environmental Temperature and Humidity in an Alpine Meadow in the Northern Tibet
摘要
Abstract
Quantifying the relationships between water use efficiency and climatic factors facilitates predicating the water use ability in alpine meadows under future climatic change. The relationships of water use efficiency with growing-season soil temperature, soil moisture, air temperature, relative humidity and vapor pressure deficit in 2010—2014 in an alpine meadow of the Northern Tibet at three elevations (4300, 4500 and 4700 m) was analyzed based on correlation analyses and multiple stepwise regression analyses. Water use efficiency increased with increasing elevation. There were significant annual variations of water use efficiency. The correlation analyses showed that water use efficiency generally increased with increasing soil and air temperatures and vapor pressure deficit, but decreased with increasing relative humidity. The multiple stepwise regression analyses indicated that soil temperature, soil moisture and relative humidity together explained the seasonal variation of water use efficiency at elevation 4300 m. Air temperature and soil temperature explained the variation of water use efficiency at elevation 4500 and 4700 m, respectively. Specifically, the temperature pre-dominated the variations of water use efficiency in this alpine meadow of the Northern Tibet. The warming and drying climatic change will likely increase the ability of water use in the alpine meadows of the Northern Tibet.关键词
高寒草甸/水分利用效率/藏北高原/气候变化/海拔梯度Key words
alpine meadow/water use efficiency/Northern Tibet/climate change/elevation gradient分类
资源环境引用本文复制引用
沈振西,付刚..藏北高原高寒草甸水分利用效率与环境温湿度的关系[J].生态环境学报,2016,25(8):1259-1263,5.基金项目
国家自然科学基金项目（41171084,31470506,31370458）,中国科学院西部之光项目“藏北高寒草甸牲畜承载力对气候变化和放牧的响应”,西藏饲草专项,国家星火计划项目（2013GA840003）,国家科技支撑计划课题 （）
