延安市城郊农村土地利用变化对生态系统服务价值的影响

Effects of Landuse Change on Ecosystem Service Value in Suburban Countryside of Yan'an City

以典型黄土丘陵沟壑区——延安市赵庄村为例,在分析2000—2006年间的土地利用变化的基础上,依据谢高地等人生态服务价值系数对土地利用系统的生态系统服务价值进行了估算,并对其进行了敏感性分析。结果表明,6 a间,研究区土地利用变化主要表现为耕地减少和撂荒地等未利用土地增加。总生态服务价值减少了32.92万元,变化率为1.86%。未利用土地、居住及建设用地、林地、灌草地的生态服务价值增加;耕地、果园、水域的生态服务价值减少。这8种服务功能类型呈减少趋势,只有娱乐文化类型在增加。敏感性指数均小于1,所采用价值系数缺乏弹性,估算价值可靠,系数适合当地情况。根据研究区生态系统服务价值变化特点,应进行针对性的土地利用结构调整。

Taking Zhaozhuang Village of Yan＇an City in the typical loess hilly and gully area as a study area, the landuse change from 2000 to 2006 was analyzed. According to coefficients of ecosystem service value （ESV） by Xie Gaodi et al. , the ESV of landuse system was estimated and the coefficient of sensitivity was also analyzed. Results indicated that landuse of the study area changed to some extent during the past 6 years and decreased farmland and increased unused land were the main types. The total ESV decreased by ￥ 329 200 and its change rate was 1. 86%. The ESVs of unused land, residential-constructed land, forest land, and shrubby grassland increased, while the ESVs of farmland, orchard, and water area decreased. Eight types of ecosystem service functions were decreased, while recreation and culture increased. The analysis of the coefficient of sensitivity indicates that the coefficient of ESV adopted is inelasticity, the result is reliable, and the ESV coefficients are suitable. Landuse structure should be pertinently adjusted according to changing characteristics of ESV.