2001-2021年内蒙古荒漠草原水分利用效率时空变化特征及影响因素研究  

Spatial and temporal variation of water use efficiency and its influencing factors in desert steppe of Inner Mongolia from 2001 to 2021

作　　者：利辉 刘铁军[2,3] 王少慧 刘东伟 LI Hui;LIU Tiejun;WANG Shaohui;LIU Dongwei(School of Ecology and Environment,Inner Mongolia University,Hohhot 010021,Inner Mongolia,China;Institute of Water Resources in Pastoral Areas,Ministry of Water Resources,Hohhot 010020,Inner Mongolia,China;Field Scientific Observation and Research Station of Grassland Ecology and Hydrology at the North Foot of Yinshan Mountain,Inner Mongolia,Hohhot 010020,Inner Mongolia,China)

机构地区：[1]内蒙古大学生态与环境学院,内蒙古呼和浩特010021 [2]水利部牧区水利科学研究所,内蒙古呼和浩特010020 [3]内蒙古阴山北麓草原生态水文野外科学观测研究站,内蒙古呼和浩特010020

出　　处：《干旱区地理》2024年第6期993-1003,共11页Arid Land Geography

基　　金：内蒙古自治区自然科学基金(2021ZD12);中央引导地方科技发展基金(2022ZY0153)。

摘　　要：水分利用效率(Water use efficiency,WUE)是表征水碳过程的重要指标,对研究生态脆弱区水碳耦合规律及其响应因素具有重要意义。基于总初级生产力(GPP)、蒸散发(ET)、气温、降水量和土壤水分系统分析了2001—2021年内蒙古荒漠草原WUE的时空变化特征,讨论了影响WUE变化的因素。结果表明:(1)内蒙古荒漠草原2001—2021年WUE平均值0.877 g C·mm^(-1)·m^(-2),空间变化范围在0.35~2.42 g C·mm^(-1)·m^(-2)。(2)预测其未来变化趋势发生转变的区域占比较大(约占69.00%),这些区域WUE未来变化趋势容易逆转。(3)空间上超过60.00%研究区的WUE与降水量、ET、土壤水分呈现正相关,其中降水量与WUE正相关最为明显(正相关区域占比约91.00%,通过显著性检验P<0.05区域占比约30.00%)。(4)WUE与气温总体呈现负相关,负相关区域占比超过60.00%。(5)气候变化在内蒙古荒漠草原WUE变化中起主要作用。内蒙古荒漠草原WUE受多种因素影响,研究结果可为气候变化背景下荒漠草原地区WUE研究提供参考。Water use efficiency(WUE)is an important indicator for characterizing water-carbon processes,and it has significant implications for studying the laws of water-carbon coupling and their response factors in ecologically fragile areas.Based on total primary productivity(GPP),evapotranspiration(ET),temperature,precipitation,and soil moisture,the spatial and temporal change characteristics of WUE in Inner Mongolia desert steppe from 2001 to 2021 were systematically analyzed,and the factors affecting WUE changes were discussed.The results show that:(1)The average value of WUE in Inner Mongolia desert steppe from 2001 to 2021 was 0.877 g C·mm^(-1)·m^(-2),with a spatial variation range of 0.35-2.42 g C·mm^(-1)·m^(-2).(2)The area where the future trend of WUE is expected to change accounted for a relatively large proportion(about 69.00%),and these regions are more likely to reverse the trend of WUE in the future.(3)More than 60.00%of the study areas showed a positive correlation between WUE and precipitation,ET,and soil moisture,of which the correlation between precipitation and WUE was the most obvious(the positive correlation area accounted for about 91.00%,and the area through the significant test P<0.05 accounted for about 30.00%).(4)WUE was generally negatively correlated with temperature,with the negative correlation area accounting for more than 60.00%.(5)Climate change plays a major role in the change of WUE in Inner Mongolia desert steppe.WUE in Inner Mongolia desert steppe is affected by multiple factors,and the research results can provide reference for the study of WUE in desert grassland areas under climate change.

关 键 词：荒漠草原 水分利用效率 人类活动 气候变化 内蒙古 

分 类 号：S812[农业科学—草业科学]