摘要
选取定量指标并结合GIS技术,基于土地利用结构内涵,对退耕还林背景下黄土高原沟壑区长武县2009年土地利用结构特征进行定量分析。研究表明:目前全县土地利用多样化指数较高,集中化指数则较低,组合类型和洛伦兹曲线体现了全县土地利用较丰富的组合特征,集约化水平较低,各乡(镇)土地利用程度不高。空间分析定量化阐明了各乡(镇)地类区位意义、县域地类斑块空间分布状态。结构分析体现了北部塬面沟坡,南部残塬沟壑2大分区的县域特色。全县土地利用总体特征为:以林地+耕地为景观基质,林地+耕地+园地+未利用地为组合类型,以农用地为主,土地利用程度较低。黄土高原沟壑区塬、坡、沟的地貌格局是土地利用空间格局的自然基础。人口密度与土地利用程度显著相关,居民工矿用地区位优势一定程度上体现了土地利用结构。黄土高原沟壑区土地利用没有直接反映经济水平,有待于进一步调整和优化土地利用现状。
Based on the understanding of connotation of land use structure,by using GIS technology the quantitative indices were selected to study the characteristics of land use structure in 2009 in Changwu County,Shaanxi Province,Loess Plateau gully area.The results showed that in Changwu County,the diversification indices of each town were relatively high,and centralization indices and land use degrees were generally low.The combination of land use types and Lorenz curve of each town showed that combination forms were abundant in the whole county at present.Spatial analysis expressed the location significance of each town and spatial distribution of landuse patches.Structure analysis could reflect the two distribution districts,slope in north and gully in south region.The main characteristics of land use structure in the county could be generalized as： landscape matrix constitute of,arable land and forest land patches,and regional land combination type was comprised of forest land,arable land,garden plot and unused land.The plateau-gully-slope morphological pattern of Loess Plateau provided a natural foundation of land use structure in the county.There was highly significant correlation between population density and land use degrees.Land use structure was embodied by location advantage of residents,industrial and mining land to some extent.Land use structure in Loess Plateau disagreed with economic level,so it is suggested that land use should be adjusted and optimized in this region.
出处
《中国水土保持科学》
CSCD
2011年第2期71-79,共9页
Science of Soil and Water Conservation
基金
中国科学院知识创新工程重大项目"耕地保育及持续高效现代农业试点工程"(KSC-YW-09-07)
黄土高原土壤侵蚀与旱地农业国家重点实验室专项经费"水蚀风蚀交错区侵蚀环境演变的地学-生物学过程及其调控"(10502-Z12-1)
关键词
土地利用
数量结构
空间结构
长武县
land use
quantitative structure
spatial structure
Changwu County
