【摘要】 草地生态系统容易受到环境变化影响,研究草地覆盖及其生态服务功能变化具有较重要的意义。本研究以石羊河流域为研究区,基于遥感数据和InVEST模型,定量估算了2000年以来草地覆盖变化以及产水量、土壤保持、固碳等服务功能,并探讨了草地覆盖变化对生态系统服务的影响。结果表明,2000–2015年间,石羊河流域草地覆盖面积明显减小;草地产水量呈先减少后增加趋势,土壤保持与固碳服务呈减少趋势;除草地覆盖与流域中游产水量无显著相关关系(P> 0.05),与下游土壤保持呈显著(P<0.001)负相关关系外,与其余不同尺度不同生态系统服务间均呈显著(P<0.001)正相关关系;石羊河流域上游草地植被显著减小,引起草地生态系统服务能力下降;改善上游的草地生态系统质量对于提高全流域草地生态系统服务具有重要意义。更多还原

【Abstract】 Grassland ecosystem is susceptible to environmental change,it is of great significance to study the changes of grassland cover and ecosystem service function.Based on the remote sensing data and InVEST model,we taken the Shiyang River basin as the research area in this paper,and quantitatively estimated the service functions of grassland cover change,water yield,soil conservation and carbon sequestration service since 2000,and discussed the effects of grassland cover change on ecosystem service.The research results showed that the degradation of grassland cover in the Shiyang River basin was obvious during 2000–2015;the water yield of grassland was decreased first and then increased,and the service of soil conservation and carbon sequestration were decreased.There was a significant negative correlation between grassland coverage and water yield in the middle reaches of the river basin,and a negative(P<0.001) correlation with the downstream soil retention while there was a significant(P<0.001) positive correlation between the grassland coverage and other ecosystem services;the obvious vegetation degradation in the upper reaches of the Shiyang River basin gave rise to the decline of grassland ecosystem service capacity,so improve the quality of grassland ecosystem in the upper reaches have a great significance to advance the ecosystem service of the whole watershed.更多还原