干旱区研究2023，Vol.40Issue(12)：1959-1968,10.DOI:10.13866/j.azr.2023.12.09
陕西黄河流域植被碳利用率时空特征及对气候的敏感性研究
Spatiotemporal characteristics of vegetation carbon use efficiency and its sensitivity to climate in the Yellow River Basin in Shaanxi Province
摘要
Abstract
Vegetation carbon use efficiency(CUE)can objectively reflect the efficiency of vegetation in sequestering atmospheric carbon and the response of vegetation to climate change.Using MOD17,land use,and meteorological data,this study applied methods,such as the Hurst exponent,correlation analysis,and sensitivity analysis to explore the spatiotemporal variability of vegetation CUE and its sensitivity to climate factors in the Shaanxi section of the Yellow River Basin from 2001 to 2021.The results showed that(1)From 2001 to 2021,the gross primary productivity,net primary productivity(NPP),and vegetation CUE in the Shaanxi section of the Yellow River Basin exhibited an increasing trend,with an average CUE value of 0.51.(2)The study area was only 14.21%of the region,exhibiting a decreasing trend.The high-value areas of vegetation CUE are primarily concentrated in the windbreak and sand-fixation areas and the Grain for Green Project areas of northern Shaanxi.The areas where vegetation CUE indicated a decreasing trend accounted for 59.96%,most of which transitioned from an increasing trend to a decreasing trend.(3)Overall,temperature and precipitation correlated negatively with vegetation CUE,but the relationship with precipitation is more significant.Regions with positive correlations with temperature and precipitation are distributed in northern Shaanxi's windbreak and sand-fixation areas.Sensitivity analysis of temperature and precipitation showed that the threshold values were 10℃ and 500 mm,respectively.When the temperature is below 10℃ and the precipitation is below 500 mm,the vegetation CUE increases with increasing temperature and precipitation.The relationship between vegetation CUE and climate factors is more significant and sensitive in arid areas,such as the conversion of farmland to forests and windbreak and sand-fixation areas in northern Shaanxi.关键词
植被CUE/时空特征/Hurst指数/气候因子/敏感性/黄河流域Key words
vegetation CUE/spatiotemporal characteristics/Hurst/climate factors/sensitivity/Yellow River Basin引用本文复制引用
王娟,王钊,郭斌,何慧娟,董金芳..陕西黄河流域植被碳利用率时空特征及对气候的敏感性研究[J].干旱区研究,2023,40(12):1959-1968,10.基金项目
陕西省科技厅自然科学基金面上项目(2023-JC-YB-279) （2023-JC-YB-279）
陕西省自然科学基金青年项目(2022JQ-232) （2022JQ-232）
陕西省气象局秦岭和黄土高原生态环境气象重点实验室开放课题(2022G-12) （2022G-12）
