干旱区研究2025，Vol.42Issue(6)：1067-1079,13.DOI:10.13866/j.azr.2025.06.10
西北干旱区近30a植被覆盖的时空变化及其对气候因子的响应
Spatiotemporal changes in vegetation coverage in the arid regions of Northwest China over the past 30 years and their response to climatic factors
摘要
Abstract
The arid region of Northwest China is an area of notable vegetation vulnerability,where vegetation cover plays a crucial role in sustaining unique terrestrial ecosystems.This study utilized Landsat data and the pix-el dichotomy model to analyze spatiotemporal variation patterns of Fractional Vegetation Cover(FVC)in the arid region of Northwest China from 1990-2022.Integrating land use data,the research employed Sen's slope estima-tion,the Mann-Kendall test,and correlation analysis to investigate FVC characteristics across different vegetation types and their responses to climatic factors.The results indicate that:(1)FVC exhibited a fluctuating upward trend,with an annual increase rate of 0.98×10-4;spatial heterogeneity was significant,with areas predominantly characterized by very low vegetation coverage,while river basin regions displayed higher FVC values.(2)Land use transformation has driven the evolution of FVC patterns,with increases in forestland and cultivated land contrib-uting to the expansion of areas with very high FVC coverage(increasing by 3.0%and 18.8%,respectively);grass-land remains the dominant cover across all levels,with an average proportion exceeding 47.7%.(3)Average pre-cipitation during the vegetation growing season ranks as follows:shrubland>forestland>grassland>cropland,whereas temperature trends are reversed;evapotranspiration follows the order:forestland>cropland>grassland>shrubland;the average annual humid area proportion is 61.03%in shrubland regions,compared to less than 5%in cropland regions.FVC shows negative correlations with precipitation(52.0%),temperature(60.2%),evapotrans-piration,and aridity index(63%).Vegetation demonstrates significant sensitivity to climate change.The findings provide an important basis for ecological management and restoration in the arid regions of Northwest China.关键词
FVC/西北干旱区/植被覆盖/趋势分析Key words
Fractional Vegetation Cover(FVC)/arid regions of northwest/vegetation coverage/trend analysis引用本文复制引用
张秀霞,韩丽莎,党星海,汪孝贤,林庆润,邓灵芝,杨明航,张喜来..西北干旱区近30a植被覆盖的时空变化及其对气候因子的响应[J].干旱区研究,2025,42(6):1067-1079,13.基金项目
甘肃省自然科学基金(24JRRA176) （24JRRA176）
