基于LUCC的江苏省生态系统服务价值评估及时空演变特征研究

Ecological Service Value Evaluation and Temporal-spatial Evolution Characteristics In Jiangsu Province Based on LUCC

基于江苏省2005、2010、2015、2018年4期土地利用/覆被变化(LUCC)遥感影像解译数据,采用生态系统二级分类的当量因子定量评估江苏省生态系统服务总价值及单项生态服务功能价值,运用空间自相关分析法探究各县级单位生态服务价值变化的时空格局演变特征。结果表明:(1)2005~2018年江苏省耕地、林地、草地面积减少,湿地、建设用地、未利用地面积增加,各时期耕地、湿地、建设用地面积的增减主导着区域土地利用变化。(2)2005~2018年江苏省生态系统服务总价值增加了60.0762×10^(8)元,水文调节为主导生态服务功能,保持湿地面积不仅主导着生态系统服务总价值变化,也是维系水文调节服务价值、保障区域生态安全的关键。(3)历年各县级单位的地均ESV整体呈较显著的空间正相关,并表现为局部空间上的集聚。高值集聚区时空格局演变保持稳定,而城镇化发展致使建设用地大量占用耕地和林地、区域性卓有成效的湿地保护和恢复工作是导致低值集聚区演变、地均ESV变化量空间分异特征的重要原因。研究结果可为江苏省制定科学合理的生态保护政策、建立生态保护修复的长效机制提供科学依据。

Based on the remote sensing image interpretation data of land use/cover change(LUCC)in Jiangsu Province in 2005,2010,2015,and 2018,the equivalent factor in the second-level classification ecosystem was applied to quantitatively assess the total value of ecosystem services and the function value of single ecological service in Jiangsu Province.Then,the spatial autocorrelation analysis method was adopted to study the temporal-spatial evolution characteristics of ecological service value changes in each county unit.The results showed that:(1)From 2005 to 2018,the area of cultivated land,forest land and grassland in Jiangsu Province decreased,while the area of wetland,construction land and unused land increased.The increase and decrease of cultivated land,wetland,and construction land area in each period dominated the regional land use change.(2)From 2005 to 2018,the total value of ecosystem services in Jiangsu Province increased by 60.0762×10^(8) yuan.Hydrological regulation was the leading ecological service function.Maintaining wetland area not only led the change of the total value of ecosystem services,but also was the key to maintain the value of hydrological regulation services and ensure regional ecological security.(3)The regional average value of ESV in all counties over the years showed significant positive spatial correlation,with local spatial agglomeration.The temporal-spatial evolution in the high-value cluster area remained stable.The massive occupation of cultivated land and forest land by construction land during the rapid urbanization development and the regional effective wetland protection and restoration work were the important reasons for the evolution of low-value cluster area and spatial differentiation characteristics of the regional average ESV variation.The research results can provide scientific basis to formulate scientific and reasonable ecological protection policies and establish long-term mechanism of ecological protection and restoration for Jiangsu Province.