摘要
河西走廊作为中国西北地区的重要经济发展带,地形多变,生态环境脆弱,在气候急剧变化以及人类活动的影响下,该地区植被水碳通量变化复杂。为探究2000—2020年河西走廊地区的植被生态变化情况,本研究利用参考作物蒸散量(ET0)与植被净初级生产力(NPP)分别表征植被水、碳通量,探究气候以及土地利用变化下2000—2020年河西走廊ET0与NPP的时空变化特征,分析植被水碳通量的主要驱动因素及交互作用。结果表明:在气候趋于暖湿,土地利用变化加速的背景下,2000—2020年ET0与NPP均呈现显著上升趋势,平均相对湿度与日照时长分别是ET0与NPP变化的主要驱动因素,ET0均值空间格局特征为“西高东低”,NPP均值为“南高北低”。气候变化加剧了河西走廊地区的植被蒸散发,人类活动使得21年来河西走廊地区荒漠化土地面积减小,其对区域植被水碳通量的干预作用大,植被生产力显著增加,因此生态环境持续向好。
As one of the important economic development zones in northwest China,Hexi Corridor is characterized by variable terrain and fragile ecological environment.Under the influence of rapid climate change and human activities,the variation of vegetation water and carbon fluxes in this region is complex.In order to explore the ecological changes of vegetation in Hexi Corridor during 2000-2020,this study used reference evapotranspiration(ET0)and net primary productivity(NPP)to represent vegetation water and carbon fluxes,respectively.The temporal and spatial evolution characteristics of ET0and NPP under climate and land use changes from 2000to 2020and their main driving factors and interactions were discussed.Under the background of warm and humid climate and accelerated land use change,both ET0and NPP showed significant upward trend from 2000to 2020.The average relative humidity and sunshine duration were the main driving factors of the changes of ET0and NPP,respectively.The spatial trend of the mean value of ET0 was“high in the west and low in the east”,and the mean value of NPP was“high in the south and low in the north”.The results showed that climate change has intensified vegetation evapotranspiration in the Hexi Corridor.The desertification land area has decreased and vegetation productivity has increased significantly in the past 21years because of human activities.Human activities have significantly interfered with water and carbon fluxes in the region,so the ecological environment has continued improving.
作者
吴昕蕾
范云飞
康德奎
何玉江
王素芬
WU Xinlei;FAN Yunfei;KANG Dekui;HE Yujiang;WANG Sufen(College of Water Resources&Civil Engineering,China Agricultural University,Beijing 100083,China;Shiyang River Basin Water Resources Utilization Center of Gansu Provincial Water Resources Department,Wuwei 733000,China)
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2022年第10期212-225,共14页
Journal of China Agricultural University
基金
国家自然科学基金面上项目(51979273)。
关键词
河西走廊
水碳通量
气候
土地利用
生态
Hexi Corridor
water and carbon fluxs
climate
land use
ecology
作者简介
第一作者:吴昕蕾,硕士研究生,E-mail:1183704003@qq.com;通讯作者:王素芬,教授,主要从事农业节水和水资源高效利用研究,E-mail:wwwsf71@163.com。
