摘要
河西地区位于中国西北干旱半干旱区,属于典型的生态环境脆弱区。基于流域尺度开展河西内陆河流植被生态质量时空变化动态监测,量化植被对气候变化和人类活动的响应,可以为未来内陆河流域地区生态保护和生态建设提供科学参考。本研究基于植被生态质量指数(EQI)和气象数据,采用趋势分析、偏相关分析和多元回归残差分析等方法研究2000—2022年河西内陆河流域植被EQI时空变化特征及气候变化和人类活动的贡献率。结果表明:2000—2022年研究区植被EQI均值为6.9,指数呈显著上升趋势,增速0.8·10 a^(-1),三大流域中石羊河流域EQI均值、年均增速均为最大;2000年以来研究区植被EQI呈增加趋势的面积占80.3%,2000—2010年植被生态质量改善和退化的面积占总面积的比例分别为30.1%和0.9%,2010—2022年为4.8%和15.2%;偏相关分析表明,研究区植被EQI与气温、降水均呈正相关,与降水的相关性更强;气候变化、人类活动对研究区植被生态质量变化贡献率为正的区域面积占比分别为77.3%、72.9%,贡献率为负的区域面积占比分别为9.7%、19.0%。总体来看,河西内陆河流域植被生态质量变化受到气候变化和人类活动的共同影响,植被生态质量呈退化变化趋势的区域中,人类活动的作用大于气候变化。
Hexi is located in arid and semi⁃arid area of Northwest China,which is a typical ecologically fragile area.We examined the temporal and spatial variations of vegetation ecological quality in the inland river basins in Hexi based on watershed scale and quantified the response of vegetation to climate change and human activities,aiming to provide scientific reference for future ecological protection and construction in inland river basins.Based on vege⁃tation ecological quality index(EQI)and meteorological data,the temporal and spatial variations of vegetation EQI in the inland river basins of Hexi from 2000 to 2022,as well as the contribution rates of climate change and human activities were investigated by using the methods of trend analysis,partial correlation analysis and multiple regres⁃sion residuals analysis.The average vegetation EQI from 2000 to 2022 was 6.9,which showed a significant upward trend with a growth rate of 0.8·10 a^(-1).Among the three major basins,Shiyang River basin had the highest average value and average annual growth rate of EQI.The area with the improved vegetation EQI accounted for 80.3%of the total since 2000.The proportions of the areas with improved and degraded vegetation EQI were 30.1%and 0.9%from 2000 to 2010,and 4.8%and 15.2%from 2010 to 2022,respectively.The vegetation EQI was positively corre⁃lated with temperature and precipitation,and was more sensitive to precipitation.The areas with positive contribu⁃tions of climate change and human activities to the variations in vegetation ecological quality accounted for 77.3%and 72.9%,while those with negative contributions accounted for 9.7%and 19.0%,respectively.Overall,the vegetation ecological quality in the inland river basins in Hexi was jointly affected by climate change and human ac⁃tivities.In the areas with degraded vegetation ecological quality,the effect of human activities was greater than that of climate change.
作者
任丽雯
王兴涛
蒋友严
REN Liwen;WANG Xingtao;JIANG Youyan(Institute of Arid Meteorology,China Meteoro-logical Administration/Key Laboratory of Arid Climate Change and Disaster Reducing of China Meteorological Ad-ministration/Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Lanzhou 730020,China;Wuwei Meteorological Bureau,Wuwei 733000,Gansu,China;Northwest Regional Climate Center,Lanzhou 730020,China)
出处
《生态学杂志》
北大核心
2025年第8期2726-2735,共10页
Chinese Journal of Ecology
基金
干旱气象科学研究基金(IAM201910)
甘肃省气象局气象科研项目(Ms2020⁃14)
甘肃省气象局气象科研项目(Zd2021⁃02)
西北干旱与生态环境遥感监测项目(GHSCXTD⁃2020⁃4)
甘肃省科技计划(25JRRH001)资助。
关键词
植被生态质量指数
时空变化
气候变化
人类活动
贡献率
vegetation ecological quality index
temporal and spatial variation
climate change
human activity
contribution rate
