甘肃省违法占用耕地的生态服务价值损失计量研究

Study on the estimation of ecological service value loss caused by illegal occupation of arable land in Gansu Province

为定量化研究违法占用耕地过程中土地利用类型变化所导致的生态系统服务价值的变化,以甘肃省为例,从县域尺度出发,运用当量因子法,对其2010~2015年违法占用耕地的生态系统服务价值损失量进行计量,并分析其时空分布特征。结果表明:(1)河西地区单位面积生态系统服务价值较中东部地区相对较低;(2)2010~2015年甘肃省土壤保持功能的生态系统服务价值损失量(4326.47万元)对违法占用耕地的生态系统服务价值损失量贡献率最大;水文调节功能的生态服务价值损失量(2436.32万元)、减少率(85.58%)和减少量(762.79万元)均为最大;(3)空间分布上甘南高原和陇南山地损失量居多,河西走廊及陇中黄土高原较少,整体由兰州市中心城区向周边县域扩展。因此,研究在加强耕地保护与违法占用耕地执法力度的基础上,可同时为生态地域特点、生态系统服务功能重要性和生态敏感性的甘肃省生态功能区划与甘肃祁连山自然保护提供相应的参考与依据,从而实现区域生态环境综合管理。

In order to quantify the change of ecosystem service value caused by the illegal occupation of arable land,the relevant data from 2010 to 2015 in Gansu Province at county level were used to estimate the ecological service value loss and the equivalent factor method was used to analyze the spatial and temporal distribution characteristics.The results showed that 1)Ecosystem service value per unit area in Hexi was relatively low compared with that in middle and eastern region;2)From 2010 to 2015,the ecological service value loss of soil maintenance in Gansu Province was 43.26 million yuan,which was the greatest contributor to the total ecological service value loss of illegal occupation of arable land;The ecological services value loss of the hydrological regulation was 24.36 million yuan,with the biggest reduction rate(85.58%)and decrement(7.6279 million/yuan);3)In terms of spatial distribution,the loss in Gannan Plateau and Longnan Mountains was the most,and th loss in Hexi Corridor and Middle Loess Plateau was less,and in whole area,it extended from the downtown area of Lanzhou to the neighboring counties.The study results could provide the corresponding reference and basis for the ecological function zoning of Gansu Province and the Natural Reserve of Gansu Qilian Mountains by considering the characteristics of ecological region,the importance of ecosystem service function and the ecological sensitivity,so that the comprehensive management of regional ecological environment could be achieved.