摘要
[目的]探究北洛河流域土地利用时空变化及其驱动力,为该区土地资源优化、环境质量改善和水沙生态要素变化分析等提供科学依据。[方法]基于GEE平台整理和处理北洛河流域1970—2019年间6期遥感影像数据,从时间变化、动态度、转移方向和空间分布等角度分析流域土地利用变化特征,并对其驱动因素进行探讨。[结果]研究时段内,北洛河流域土地利用类型以耕地、林地和草地为主,数量结构从2000年前的1∶1.1∶0.6变化到2000年后的1∶2.7∶0.7。1970—2019年研究区耕地、草地和水域的减少率分别为16.6%,6.7%和0.1%,林地和建设用地的面积增加率为19.9%和1.3%。流域耕地和草地斑块趋于分散且简单化,林地斑块趋于聚集和复杂化。土地利用转移主要以耕地转林地、耕地转建设用地和草地转林地为主。流域土地利用综合动态度先增后减,2000—2010年间达最大。流域中,上游丘陵沟壑区土地利用结构变化最为显著,其次为中游的甘泉、宜君、华池、合水等县。[结论]国家政策的演变、社会经济发展和人口增长决定了土地利用变化的方向和程度,自然因素为长期辅助影响因素。
[Objective]The spatial-temporal changes and associated driving forces of land use in the Beiluo River basin were investigated in order to provide a scientific basis for the optimization of land resources,the improvement of environmental quality and further exploration on runoff-sediment dynamics in the area.[Methods]Based on the google erath engine(GEE)platform,we sorted and processed six-phase remote sensing images acquired in 1970—2019 for the Beiluo River basin.The characteristics of land use change in the basin were captured from the perspectives of temporal variation,dynamics attitude,transfer direction and spatial structure,and the associated driving factors were explored.[Results]During the study period,the land use types in the Beiluo River basin were mainly woodland,cultivated land and grassland,and the quantitative structure changed from 1∶1.1∶0.6 before 2000 to 1∶2.7∶0.7 after 2000.During 1970—2019,cultivated land,grassland and water area in the basin decreased by 16.6%,6.7%and 0.1%,respectively,while contrarily woodland and construction land have increased by 19.9%and 1.3%,respectively.The patches of cultivated land and grassland in the basin tended to be dispersed and simple,while the woodland tended to be aggregated and complicated.Land use transfer mainly occurred as the conversion of cultivated land to woodland and construction land,and the conversion of grassland to woodland.The comprehensive land use dynamic attitude of the basin increased firstly and then decreased,reaching a peak during 2000—2010.In the basin,the upstream hilly and ravine area saw the most significant change of land use structure,followed by Ganquan,Yijun,Huachi and Heshui counties in the middle reaches.[Conclusion]The evolution of national policies,socio-economic development and population growth determine the direction and extent of land use change,and natural factors are long-term auxiliary influencing factors.
作者
邹亚东
何亮
张晓萍
马宝有
王浩嘉
王妙倩
薛帆
贺洁
Zou Yadong;He Liang;Zhang Xiaoping;Ma Baoyou;Wang Haojia;Wang Miaoqian;Xue Fan;He Jie(State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China;Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;Yan’an Huanglong State Forestry Administration, Yan’an, Shaanxi 71600, China)
出处
《水土保持通报》
CSCD
北大核心
2021年第6期209-219,共11页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目“黄土高原径流泥沙过程对土地利用变化和植被演替的响应及其区域差异”(41877083)
国家自然科学基金项目(41440012,41230852,41101265)。
关键词
时空变化
动态度
转移方向
土地利用程度
北洛河流域
temporal and spatial changes
dynamic degree
transfer direction
land use degree
Beiluo River basin
