【摘要】 生态系统服务已成为国际上生态学和经济学研究的热点,水源涵养是草地生态系统重要的服务之一,是植被、水与土壤相互作用所产生的综合功能的体现。基于降水贮存量法,利用草地植被覆盖度确定水分调节参数,估算了中国不同区域、不同时段下草地生态系统的水源涵养量。通过前后两个10年(20世纪80年代末—2000年、2000—2010年)年平均水源涵养量的对比分析,评估中国草地生态系统水源涵养服务功能时空变化。结果表明,前后两个10年相比较,我国草地生态系统年平均水源涵养量增加了22.15亿m3/a,水源涵养服务功能保有率上升了4.80%,草地生态系统水源涵养服务功能有所提升。更多还原

【Abstract】 Assessment of ecosystem service has become an international hot point of ecology and economics.Water regulation is one of the important services of grassland ecosystem.It is the comprehensive performance of interactions among vegetation,water and soil.We used the rainfall storage capacity method to calculate the water regulation amount of grassland ecosystem in different regions and periods in China based on the grassland vegetation coverage,and evaluated the spatiotemporal dynamics of water regulation service for grassland ecosystem.The following conclusions were obtained.Compared with the first ten years(1980s—2000),the annual mean water regulation amount of grassland ecosystem in China increased by 2.215 billion m3 per year during the period from2000 to 2010.At the same time,the water regulation service ratio of grassland ecosystem increased by 4.80%.The water regulation service of grassland ecosystem in China was somewhat improved.更多还原