黄河中游不同地貌条件下植被干旱时空特征及影响因素  

Spatio-temporal characteristics and driving factors of vegetation drought in the middle Yellow River under different geomorphic conditions

作　　者：郭宇星 孙从建 陈伟 张齐飞 Guo Yuxing;Sun Congjian;Chen Wei;Zhang Qifei(College of Geography,Shanxi Normal University/Shanxi Normal University Yellow River Middle Reaches Ecological Environment Research Center,Taiyuan 030031,Shanxi,China)

机构地区：[1]山西师范大学地理科学学院/山西师范大学黄河中游生态环境研究中心,山西太原030031

出　　处：《地理科学》2024年第9期1676-1683,共8页Scientia Geographica Sinica

基　　金：山西省哲学社会科学规划项目(2022YK016);山西省研究生教育教学改革项目(2022YJJG48)资助。

摘　　要：利用归一化植被指数、地表温度和降水数据构建温度植被降水干旱指数(TVPDI)分析黄河中游2000—2021年植被干旱时空特征及影响因素,论证了黄河中游退耕还林还草工程实施与区域植被干旱特征间的关系。结果表明:①黄河中游2000—2021年多年平均TVPDI值呈不显著上升趋势,TVPDI多年均值为0.708,对应干旱等级为轻旱。②黄河中游2000—2021年TVPDI有较强的空间分异性,呈现“东北、西南部地区旱情较轻,西北、东南部地区旱情较重”的空间分布格局;从各地貌分区来看,黄土高塬沟壑区旱情较轻,风沙区与河谷平原区旱情较重。③黄河中游TVPDI空间分异的主要影响因子为气温、蒸散发和降雨量,且与TVPDI存在显著线性关系。黄河中游2000—2021年植被覆盖度与蒸散发量均呈增加趋势,土壤水分呈下降趋势。Drought is a type of natural disaster that lasts for a long time and causes a lot of damage.It has a negative impact on the security of the water supplies in the region,human production and life,and economic growth.In order to analyze the spatial-temporal characteristics and underlying causes of vegetation drought in the middle Yellow River from 2000 to 2021,the temperature vegetation Precipitation Drought Index(TVPDI)was developed in this study using normalized vegetation index,surface temperature,and precipitation data.Additionally,the relationship between the implementation of the project to convert farmland in the middle Yellow River to forest and grassland and regional vegetation drought was examined.The findings revealed that:1)The multi-year average TVPDI value in the middle reaches of the Yellow River from 2000 to 2021 showed an insignificant upward trend,and the average multi-year TVPDI value was 0.708,corresponding to a light drought grade.2)TVPDI in the middle reaches of the Yellow River from 2000 to 2021 has a strong spatial differentiation,showing a spatial distribution pattern of“drought is lighter in the northeast and southwest regions and heavier in the northwest and southeast regions”;From the perspective of each geomorphic region,the drought in the loess plateau gully area is light,and the drought in the wind-sand area and the valley plain area is heavy.3)The main factors affecting the spatial differentiation of TVPDI in the middle Yellow River are temperature,evapotranspiration and rainfall,and there is a significant linear relationship with TVPDI.In the middle reaches of the Yellow River from 2000 to 2021,vegetation coverage and evapotranspiration showed an increasing trend,while soil moisture showed a decreasing trend.

关 键 词：退耕还林还草工程 黄河中游 植被干旱 TVPDI 

分 类 号：K903[历史地理—人文地理学]