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河西走廊植被水碳通量对气候变化和人类活动的响应
吴昕蕾1,范云飞1,康德奎2,何玉江2,王素芬1*
0
(1.中国农业大学 水利与土木工程学院, 北京 100083;2.甘肃省水利厅石羊河流域水资源利用中心, 甘肃 武威 733000)
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。
关键词:  河西走廊  水碳通量  气候  土地利用  生态
DOI:10.11841/j.issn.1007-4333.2022.10.19
投稿时间:2022-02-28
基金项目:国家自然科学基金面上项目(51979273)
Responses of vegetation water and carbon fluxes to climate change and human activities in Hexi Corridor
WU Xinlei1,FAN Yunfei1,KANG Dekui2,HE Yujiang2,WANG Sufen1*
(1.College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China;2.Shiyang River Basin Water Resources Utilization Center of Gansu Provincial Water Resources Department, Wuwei 733000, China)
Abstract:
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 ET0 and NPP under climate and land use changes from 2000 to 2020 and their main driving factors and interactions were discussed. Under the background of warm and humid climate and accelerated land use change, both ET0 and NPP showed significant upward trend from 2000 to 2020. The average relative humidity and sunshine duration were the main driving factors of the changes of ET0 and 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 21 years because of human activities. Human activities have significantly interfered with water and carbon fluxes in the region, so the ecological environment has continued improving.
Key words:  Hexi Corridor  water and carbon fluxs  climate  land use  ecology