摘要
选取新疆伊犁河谷作为我国西北干旱与半干旱区草地生态典型分布区，利用MODISNDVI遥感数据，反演草地植被覆盖度，并以草地覆盖度作为生态服务价值计算的参考因子，实现生态服务价值的空间异质表达，定量分析伊犁河谷草地退化的时空特征及其对生态服务价值的影响。研究结果表明：（1）2001--2015年伊犁河谷90．04％的草地出现不同程度的退化，草地退化面积及覆盖度降幅逐步增大，但退化以轻度为主，且退化速度在2010--2015年有所减缓；（2）草地退化致使草地生态服务价值总量减少10．30％，由畜牧超载和过牧所致使的草地生态服务价值减少总量远高于其食物和原材料价值的损失；（3）草地生态服务价值减少主要由高覆盖草地退化引起，加强对高覆盖草地的保护和修复是草地生态功能恢复快速有效的途径。
Talking Ili River Valley of Xinjiang as a typical area of grassland ecology in the arid and semi-arid areas of northwest China, the spatial-temporal characteristics of grassland degradation and its impact on ecological service value were analyzed based on fractional vegetation coverage retrieved from MODIS NDVI, and the calculation of the spatial heterogeneity of ecological service value achieved by taking the fractional vegetation coverage as determinant. The results showed that： （1） 90.04% of the grassland degenerated to varying degrees during 2001-2015. The area and decreasing magnitude of the degraded grassland enlarged continuously, though the degree of degradation was mild. The rate of degradation has slowed in the 2010-2015 period. （2） Grassland degradation resulted in a reduction in the total value of grassland ecosystem services by 17.14%. The total loss value of grassland ecological service caused by livestock overload and overgrazing was much higher than that of food and raw materials ecological service. （3） The loss of grassland ecological service value was mainly caused by the degradation of high-coverage grassland. Strengthening the protection and restoration of high-coverage grassland is a quick and effective way to restore the ecological function of grassland.
出处
《生态经济》
北大核心
2018年第1期191-196,共6页
Ecological Economy
基金
新疆维吾尔自治区自然科学基金项目“伊犁河谷主要草地生态系统净初等生产力遥感估算”(2015211C302)
