摘要
为揭示塔里木河流域实施综合治理后20 a下游区土地利用变化及其对生态风险的影响,利用2001、2010、2019年三期Landsat遥感影像,构建土地利用变化下的景观生态风险评价模型,开展塔里木河下游区的土地利用变化、景观生态风险评价及其时空分异研究。结果表明:2001-2019年,塔里木河下游区未利用地面积减少,水域湿地、林地、草地面积显著增加。景观生态风险的空间分布呈现显著正相关性,主要为高-高和低-低集聚模式。塔里木河下游区以低和较低生态风险区为主,占流域面积72.61%以上,高生态风险区主要分布于水域湿地,较低生态风险区多分布于林地、草地,低生态风险区主要分布于未利用地,耕地分布区由较高转变为中生态风险。整体生态风险先略有增加后逐渐降低,高、较高生态风险面积显著减少了42.4%,塔里木河下游区生态系统正在逐步恢复。
In order to reveal the impact of land-use change on the ecological risk of the lower reaches of Tarim River after the comprehensive management of Tarim River in 20 years,by using the Landsat remote sensing images of 2001,2010 and 2019,a model of landscape ecological risk assessment under the land-use change is constructed,and the research on the land-use change,landscape ecological risk assessment and its spatio-temporal differentiation in the lower reaches of Tarim River is carried out.The results show that:from 2001 to 2019,the area of unused land in the lower reaches of Tarim River decreased,and the area of water wetland,forest land and grassland increased significantly.The spatial distribution of landscape ecological risk shows a significant positive correlation,mainly for the high-high and low-low clustering model.The lower reaches of Tarim River are dominated by low and lower ecological risk areas,accounting for more than 72.61%of the basin area.The high ecological risk areas are mainly distributed in water wetland,the low ecological risk areas are mostly distributed in forest land and grassland,the low ecological risk areas are mainly distributed in unused land,and the cultivated land distribution area changes from high to medium ecological risk.The overall ecological risk increased slightly and then decreased gradually.The area of higher and high ecological risk decreased significantly by 42.4%.The ecosystem in the lower reaches of Tarim River is gradually recovering.
作者
沈海岑
薛联青
SHEN Hai-cen;XUE Lian-qing(Hydrology and Water Resources College, Hohai University, Nanjing 210098, China)
出处
《中国农村水利水电》
北大核心
2020年第11期77-82,共6页
China Rural Water and Hydropower
基金
国家重点研发专项计划(2017YFC0404304)
国家自然科学基金(51779074)
省、市、自治区科技项目(20188028206)。
关键词
生态风险
土地利用变化
空间分析
塔里木河下游
ecological risk
changes in land use
spatial analysis
lower reaches of Tarim River
