伊犁河三角洲植被覆盖度时空变化特征及影响因素OA

Vegetation along inland rivers in arid zones is sensitive to the dual impacts of climate change and human activities.In this study,the Ili River was selected for a case study,and we systematically ana-lyzed the temporal and spatial characteristics of vegetative cover in the Ili River delta from 1994 to 2022 using remote sensing data,a dichotomous image model,Sen+Mann-Kendall test,the Hurst index and Pearson correlation.Results show:(1)From 1994 to 2022,the mean vegetative cover in the Ili River delta exhibited a fluctuating upward trend,with an average growth rate of 3.6×10-3/a(R2=0.492).The vegeta-tion cover ranged from 0.30 to 0.47 during this period,with the minimum value occurring in 1996 and the maximum value in 2017.(2)Spatially,areas with increasing vegetative cover were mostly located in the central and northwestern areas of the delta,while areas of decreasing vegetative cover were primarily dis-tributed in the arid edges of the delta.Land with low vegetation cover accounted for the largest proportion in the study area,fluctuating within a wide range(36.37％-63.79％),while land with high vegetation cov-er exhibited a smaller range(8.97％-23.52％).Vegetative cover in the basin gradually increased from the central delta to the northwest.The central and western delta were characterized by medium-to-high vege-tative cover,with wetland(2.97％)and forest land(28.21％)being the primary land use types.In contrast,the northeastern and southwestern regions were dominated by low vegetative cover areas,with bare and desert lands as the primary land uses(62.73％).(3)The overall Hurst index of vegetative cover in the del-ta was＞0.5,with a positive persistence indicating that future vegetative cover will continue the trend of the past 29 years.(4)Correlation analysis showed that runoff volume exerted the greatest influence on vegetative cover,followed by temperature,while precipitation had the least affect.The results of this re-search support ecological health conservation in the Ili River basin,sustainable development of regional water resources and the protection of soil and water quality in central Asia.