摘要
利用黄河源区1977-2006年土地覆盖数据集,分析了土地利用覆盖变化格局。根据高寒草地生态系统的特点,改进了生态功能服务价值系数计算方法,把土地利用的生态效益转化为简单易懂的货币形式,为决策者提供直观的生态信息。同时利用基于案例推理的CA模型模拟黄河源区2018年的土地覆盖情景,并得到其生态服务价值。研究表明:1977-2006年生态系统服务价值由460亿元降至418亿元,其中林地、高覆盖草地与湿地的生态服务价值分别减少10亿元、30亿元和20亿元,中、低覆盖草地生态服务价值提高20亿元,水体与沙(裸)地等变化不大。2006-2018年草地覆盖度将逐步上升,高、中覆盖度草地面积逐渐扩大,低覆盖度草地面积减小,生态服务价值得到较大幅度提升。
The changes of land use/cover type are analyzed based on the land cover data sets during 1977--2006 in source region of the Yellow River. According to the characteristics of alpine grassland ecosystem, this paper improves the calculation method of ecosystem service value coefficient. It changes eeo-efficieney of land use into straightforward form of money, which providing intuitive ecological information to the decision makers. With the based reasoning case CA model, this paper simulates the ecosys- tem service value and the dynamic evolution process of land cover change in 2018. The result indicated that the ecosystem service value dropped from 46 billion Yuan to 41.8 billion Yuan. The ecological service value of woodland, grassland with high coverage and wetlands were reduced by 1 billion Yuan, 3 billion Yuan and 2 billion Yuan. Medium and low coverage grassland ecosystem services values enhance 2 billion Yuan, water and sand （bare） ground change little. The grassland coverage gradually increase from 2006 to 2018% the high,medium coverage grassland area gradually expands; low coverage grassland area decreases and the ecosystem service value have been more substantial upgrade.
出处
《地理与地理信息科学》
CSCD
北大核心
2014年第5期99-104,共6页
Geography and Geo-Information Science
基金
国家重点基础研究发展计划(973计划)项目(2010CB951101)
关键词
土地利用/覆盖
生态服务价值
CA模型
黄河源区
and use/land cover
ecosystem services value
CA model
source region of the Yellow River
