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2000—2020年自贡市土地利用格局时空变化及其驱动力分析

Spatial-temporal changes of land use pattern and its driving factors in Zigong City from 2000 to 2020
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摘要 基于自贡市2000—2020年5期土地利用数据,利用土地利用转移矩阵、景观指数分析自贡市21年土地利用格局变化特征,结合自贡市自然地理与经济发展状况,选取11个土地利用变化驱动因子,利用PLUS模型探究自贡市土地利用变化驱动机制,为该地区国土资源利用与可持续发展提供理论参考。结果显示,2000—2020年自贡市土地利用类型以农田为首,其次为林地与建设用地,21年间林地、建设用地面积分别增加115.89 km^(2)、56.72 km^(2),农田减少178.90 km^(2),水域面积变化较小,农田减少区域主要在市高海拔地区,建设用地增加区域主要为人口集中的市县中心区域。在土地转化方面,农田与林地、林地与建设用地之间的转化占主导地位,2000—2020年农田向林地转化157.37 km^(2),占总转出面积的68.61%。农田斑块数量增加,连通性减弱,斑块形状趋向不规则发育,林地破碎化程度减弱,建设用地斑块形状复杂化,整体景观多样性增强但连通性减弱,破碎化程度增强。对土地利用类型扩张进行驱动力分析,各驱动因素在不同程度上影响着土地利用格局变化,农田与林地扩张贡献度最大的驱动因素均为高程,建设用地扩张的主要驱动因子为人口密度。 Absrtact:Based on the land use data of Zigong City spanning from 2000 to 2020,the characteristics of land use pattern changes in Zigong City over the past 21 years were analyzed by using land use transfer matrix and landscape index.Combined with the natural geography and economic development status of Zigong City,11 driving factors of land use change were selected,and the driving mechanism of land use change in Zigong City was explored by using the PLUS model,which could provide theoretical references for the utilization and sustainable development of land and resources in this region.The results showed that from 2000 to 2020,the type of land use in Zigong City was dominated by farmland,followed by woodland and building land.During this period,the area of woodland and building land increased by 115.89 km^(2) and 56.72 km^(2) respectively,while the area of farmland decreased by178.90 km^(2),with little changes in the water body area.The decrease in farmland was mainly concentrated in high-altitude areas,while the increase in building land occurred mainly in the central areas of populous urban and county centers.In terms of land conversion,the conversion between farmland and woodland,woodland and building land,was dominant.From 2000 to 2020,the conversion of farmland to woodland accounted for 157.37 km^(2),representing 68.61%of the total conversion area.The number of farmland patches increased,while connectivity decreased,leading to irregular development of patch shapes.The fragmentation degree of woodland decreased,while the complexity of building land patches increased.The overall landscape diversity was enhanced,but connectivity was decreased,and the fragmentation degree was intensified.The analysis of the driving forces behind the expansion of land use types revealed that various factors influenced the changes of land use pattern to certern degrees.Elevation was the predominant driving factor for the expansion of farmland and woodland,and population density was the main driving factor for the expansion of build
作者 罗绪富 董正亮 LUO Xufu;DONG Zhengliang(Institute of Nonmetallic(salt industry)Geological Survey,Sichuan Institute of Geological Survey,Zigong 643000,China)
出处 《四川林业科技》 2024年第5期58-67,共10页 Journal of Sichuan Forestry Science and Technology
基金 四川省科技计划资助(2022YFS0576)。
关键词 土地利用变化 景观指数 PLUS模型 自贡市 land use change landscape index PLUS model Zigong city
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