摘要
对武山县土地利用变化和生态敏感性开展研究,明晰区域内时空变化下生态环境发展趋势。对2000—2020年武山县土地利用变化、土地利用程度等进行初步分析,选取高程、归一化植被指数、降雨侵蚀力、土壤可蚀性等单因子,结合变异系数法进行区域综合生态敏感性评价;利用双变量自相关分析,探究两者的空间关联特征。结果表明,武山县2000—2020年间,草地是覆盖最广的土地利用类型,整体变化为草地、建设用地面积占比增大,耕地减少,林地、水域、未利用地波动较小;土地利用程度呈显著的正相关性特征,具有较强的空间聚集性,高值区集聚于武山县中部,低值区集聚于武山县南部海拔较高地区;生态敏感性程度整体上呈大幅下降趋势,且均呈显著的正相关,空间聚集性较强;土地利用程度与生态敏感性的空间关联特征为负相关,低—高聚集区与高—低聚集区总体上呈现扩增态势;武山县的生态分区包括生态屏障区、生态管控区、生态提升区和生态防护治理区。20年间武山县土地利用程度指数略微减小,生态敏感性变化特征总趋势向好,土地利用程度与生态敏感性间的负相关性不断增强,人为活动与自然因素在生态系统平衡中越来越趋于稳定。该成果可为河谷型城市国土空间规划与管控生态风险提供一定科学依据。
Research on land use change and ecological sensitivity in Wushan County was carried out to clarify the development trend of the ecological environment under the spatial and temporal changes in the region.Preliminary analysis of land use change and land use degree in Wushan County from 2000 to 2020 were carried out.Single factors such as elevation,normalized vegetation index,rainfall erosivity,and soil erodibility were selected for comprehensive regional ecological sensitivity evaluation combined with the coefficient of variation method.Bivariate spatial autocorrelation analysis was then applied to assess the spatial relationship between land use intensity and ecological sensitivity.The results show that grassland is the most widely covered land use type in Wushan County from 2000 to 2020.The overall change in land use types is that the proportion of grassland and construction land area increases,and arable land decreases.Forest land,water area,and unused land fluctuate less.The degree of land use shows significant positive correlation characteristics.It has strong spatial aggregation.High-value areas are clustered in the central part of Wushan County.Low-value areas are clustered in the southern part of Wushan County,where the altitude is higher.The degree of ecological sensitivity in Wushan County showed an overall significant downward trend.And all of them are significantly positively correlated,with strong spatial aggregation.The spatial correlation between the degree of land use and ecological sensitivity is negative,and the low-high aggregation area and the high-low aggregation area generally show an increasing trend.The ecological zoning of Wushan County includes ecological barrier zone,ecological control zone,ecological enhancement zone and ecological protection and management zone.Over the 20 years,the land use intensity index slightly decreased,while the trend in ecological sensitivity improved.The negative correlation between land use intensity and ecological sensitivity strengthened,suggesting increasing stability between human activities and natural factors in maintaining ecological balance.The results can provide a certain scientific basis for the land space planning and control of ecological risks in river-valley cities.
作者
刘鸿雁
刘学录
曲菲
吴英英
赵琪琪
张苗苗
Liu Hongyan;Liu Xuelu;Qu Fei;Wu Yingying;Zhao Qiqi;Zhang Miaomiao(College of Resources and Environment,Gansu Agricultural University,Lanzhou 730070,China;College of Management,Gansu Agricultural University,Lanzhou 730070,China)
出处
《资源环境与工程》
2025年第1期93-106,共14页
Resources Environment & Engineering
基金
多规合一背景下的生态型土地整治与生态屏障功能研究(GAU-XZ-20160812)。
关键词
土地利用
生态敏感性
变异系数法
双变量自相关
武山县
land use
ecological sensitivity
coefficient of variation method
bivariate autocorrelation
Wushan County
