水资源保护2024，Vol.40Issue(3)：44-51,8.DOI:10.3880/j.issn.1004-6933.2024.03.006
黄河流域植被总初级生产力对持续性干旱水分亏缺的响应
Response of gross primary productivity of vegetation to persistent drought-induced water deficit in the Yellow River Basin
摘要
Abstract
Using data on the gross primary productivity(GPP)of vegetation and high-precision stratified soil moisture content,the spatiotemporal distribution and change characteristics of GPP during the growing season in the Yellow River Basin from 2001 to 2020 were analyzed.The correlation between soil moisture at different depths in the basin was quantified,and the response of GPP of different vegetation types to continuous soil moisture deficit events during the growing season was investigated.The results indicate that GPP in the Yellow River Basin exhibits a spatial distribution characterized by higher in the east and south,and lower in the west and north.During the growing season,the cumulative GPP is highest in cropland,followed by woodland and grassland.There is an overall increasing trend of GPP in the basin in the study period,with cropland showing the highest relative growth rate,followed by grassland and woodland.There are significant spatial and temporal differences in soil moisture across the basin.The influence of surface soil moisture fluctuation on deep soil water content diminishes with increasing depth,and the correlation between surface and deep soil moisture contents in woodland and cropland is much higher than that in grassland.The sensitive depth range of GPP to soil moisture is 0 to 40 cm in grassland and cropland in the Yellow River Basin,while it extends to 0 to 100 cm in woodland.Within the depth sensitive zones,as the duration of continuous soil moisture deficit increases,GPP of grassland and cropland undergoes a process of brief stability,followed by an accelerated decline,and then a decelerated decline.In contrast,GPP of woodland shows a brief decline,followed by a process of prolonged stability,and then an accelerated decline.关键词
总初级生产力/土壤含水量/持续性干旱/水分亏缺/黄河流域Key words
gross primary productivity/soil moisture content/persistent drought/water deficit/Yellow River Basin分类
天文与地球科学引用本文复制引用
薛联青,王文壮,刘远洪,韩强,杨明杰..黄河流域植被总初级生产力对持续性干旱水分亏缺的响应[J].水资源保护,2024,40(3):44-51,8.基金项目
国家重点研发计划项目(2023YFC3206804) （2023YFC3206804）
新疆生产建设兵团科技合作项目(2022BC001) （2022BC001）
国家自然科学基金项目(51779074) （51779074）
