陕西省退耕还林(草)前后LUCC对生态系统服务的影响

基于1980s，1995年，2000年和2005年四期的土地利用矢量数据，借助ArcGIS技术，对退耕还林（草）前后的陕西省土地利用状况和生态系统服务价值进行了评估；进而借助SPSS探讨了土地利用程度对生态系统服务价值的影响。结果表明:相比于改革开放初期，退耕还林（草）前陕西省土地利用程度增加，而后随着退耕还林（草）的实施又逐步下降，生态系统服务价值在退耕还林（草）前后的变化趋势则与之相反。经线性拟合检验，退耕还林（草）前后4个年份陕西省各县土地利用程度综合指数与单位面积生态系统服务价值的相关系数绝对值均超过0.7，且在0.01水平上显著，说明二者之间存在较强的负相关性。

Influence of Land Use/Cover Changes on Ecosystem Services in Shaanxi Province before and after Returning Farmland to Forest/Grass

Based on land use data from 1980s, 1995, 2000 and 2005 representing the initial stage of Reforming and Opening Policy, before and after the Returning Farmland to Forest/Grass Project respectively, land use degree and ecosystem service values in Shaanxi Province were assessed with the help of ArcGIS. SPSS was also used in order to explore the effect of land use degree on ecosystem service values. The results showed that land use degree index of Shaanxi Province increased before Returning Farmland to Forest/Grass and decreased after it compared with the initial stage of Reforming and Opening, while the total value of ecosystem service decreased firstly and then kept on increasing. The linear fitting test showed that the absolute value of correlation coefficient between land use degree index and ecosystem service values per unit area was greater than 0.7, which reflected the negative correlation between them.