北部湾钦江流域土地利用变化与生态服务价值时空异质性

Land Use Change and Temporal-Spatial Heterogeneity of Ecosystem Service Value in the Qinjiang River Basin of the Beibu Gulf Rim

文章基于2000和2012年的土地利用数据,采用土地利用转移流网络和GIS密度制图法定量分析研究区土地系统时空动态变化及其空间集聚效应,并在此基础上应用地统计学方法对研究区土地利用生态服务价值进行时空异质性分析。结果显示:1)流域建设用地、水域和园地呈增加趋势,而耕地、林地和草地则呈现减少趋势;2)流域整体土地系统共存在30种土地利用转移流网络关系,上游27种,中游26种,下游17种,耕地、建设用地、草地与林地之间的网络转移关系决定了北部湾钦江流域土地系统土地利用变化的主体方向;3)通过选用不同的变异函数模型对钦江流域生态服务价值空间结构分析可知,2000年流域生态服务价值的最佳拟合模型应为指数模型,而2012年则为球状模型;4)流域整体生态服务价值总量由2000年的802 077.44万元减到2012年的787 794.14万元,减少了14 283.29万元。中游的生态服务价值最高,上游的生态服务价值次之,下游的生态服务价值最小。

Based on land use data of the Qinjiang River Basin of the Beibu Gulf Rim in 2000 and 2012, This paper analyzed the temporal-spatial dynamic changes of land system and its spatial agglomeration effect with methods of land use transfer flow network and GIS density mapping, and evaluated the temporal-spatial heterogeneity of land use ecosystem service value with geostatistics methods. The results show that： 1） The built-up area, water body and garden land were increased, while the farmland, woodland and grassland were decreased in the Qinjiang River Basin; 2） There are 30 kinds of land transfer network flow relations in the whole land system on the basin, the upstream exists 27 kinds, the midstream 26 and downstream 17 kinds. The network transfer relationship between the farmland, built-up area, grassland and woodland dominates the main direction of land use change in the study area. 3） With different variogram function models for the spatial structure of the ecological service value, the best model for ecological service value matched in 2000 is the exponential model, while in 2010 it is the spherical model; 4） The overall amount of ecosystem services value in the Qinjiang River Basin reduced from 8.02 billion yuan in 2000 to 7.88 billion yuan in 2012, with a reduction of 142.83 million yuan. The ecological service value is highest in the midstream, followed by the upstream, and the downstream is minimum.