基于地形梯度的冀西北间山盆地生态系统服务价值评估——以河北省怀来县为例

Evaluation of Ecosystem Service Values of Mountainous Basins in Northwest Hebei Province Based on Terrain Gradient——A Case Study of Huailai County, Hebei Province

为从地形梯度上对怀来县生态系统服务价值进行评估,利用2003年、2013年土地动态度和DEM数据,定量分析了怀来县生态系统服务价值的空间分布及变化特征,并对怀来县敏感性指数进行了分析。结果表明:怀来县生态系统服务总价值在2003—2013年共增加了0.38亿元,其中园地和林地的生态系统服务价值分别增加了7 077.63万元、4 331.36万元,水域和耕地的生态系统服务价值分别减少4 190.84万元、3 292.74万元;生态系统服务价值在高程上呈南北高、中部低的分布趋势,生态系统服务价值在高程梯度上主要集中于600~900 m范围内,在坡度梯度上主要集中在15°~25°范围内;在单项生态系统服务价值中,水源涵养、废物处理和食物生产生态系统服务价值由于水域和耕地面积的减少而明显减少,共减少2 451.3万元;通过对怀来县各地类敏感性指数进行计算,得出的敏感性指数均小于1,说明怀来县生态系统服务价值(ESV)对于生态价值系数(VC)是缺乏弹性的,文章采用区域生态价值系数核算结果是可信的。

To assess the value of the ecosystem service in Huailai County from the terrain gradient,we used the land dynamics and DEM data of 2003 and 2013 to quantitatively analyze the spatial distribution and characteristics of ecosystem services in Huailai County.The county susceptibility index was analyzed.The results showed that the total value of ecosystem service in Huailai County had increased by 38 million yuan between 2003 and 2013,and the values of ecosystem services in the garden and woodland had increased by 70.776 3 million yuan,43.313 6 million yuan,respectively,and the the values of ecosystem services of water bodies and cultivated lands decreased by 41.908 4 million yuan,32.927 4 million yuan,respectively;the value of ecosystem services was mainly in the range of 600~900 m in the gradient;the value of water conservation,waste treatment and food production ecosystem services significantly decreased by 24.513 million yuan due to the decrease of water area and cultivated land area.In the range of 15°~25°,the sensitivity index of Huailai County was less than 1,which indicates that the ecosystem value of Huailai County was inelastic to the ecological value coefficient.The result calculated by using the coefficient of the regional ecological value was credible.