基于多源GPP和ET产品的秦岭生态系统水分利用效率研究  

Study on the Ecosystem Water Use Efficiency of the Qinling Mountains with Multi-source GPP and ET Products

作　　者：黄卓 曹银轩 徐喜娟 陈上[1,2] 冯浩[2,3] 王钊 于强[3,4] 何建强 HUANG Zhuo;CAO Yinxuan;XU Xijuan;CHEN Shang;FENG Hao;WANG Zhao;YU Qianng;HE Jianqiang(Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education,Northwest A&F University,Yangling,Shaanxi 712100;Institute of Water-saving Agriculture in Arid Areas of China,Northwest A&F University,Yangling,Shaanxi 712100;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Water and Soil Conservation,Chinese Academy of Science and Ministry of Water Resource,Yangling,Shaanxi 712100;Key Laboratory of Eco-Environment and Meteorology,Qinling Mountains and Loess Plateau,Shaanxi Meteorological Bureau,Xi’an 710016)

机构地区：[1]西北农林科技大学旱区农业水土工程教育部重点实验室,陕西杨凌712100 [2]西北农林科技大学中国旱区节水农业研究院,陕西杨凌712100 [3]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 [4]陕西省气象局秦岭和黄土高原生态环境气象重点实验室,西安710016

出　　处：《水土保持学报》2022年第5期181-194,203,共15页Journal of Soil and Water Conservation

基　　金：陕西重点产业创新链(群)项目(2020ZDLSF06-02);陕西省重点研发计划重点产业创新链(群)-农业领域项目(2019ZDLNY07-03);西北农林科技大学人才专项;高等学校学科创新引智计划(111计划)项目(B12007)。

摘　　要：通过评价多种生态系统总初级生产力(gross primary productivity,GPP)和蒸散(evapotranspiration,ET)遥感数据产品,构建了适用于我国秦岭区域的GPP和ET组合数据集,并计算分析了秦岭区域生态系统水分利用效率(water use efficiency,WUE)的时空变化规律。结果表明:不同产品对于不同植被类型GPP和ET的估算效果差异较大,其中VPM GPP和RF GPP这2种GPP产品,China ET和PML-V2 ET这2种ET产品的总体表现较好。秦岭区域的多年平均GPP_(year)为1489.95 g C/m^(2),ET_(year)为588.49 mm,WUE_(year)为2.56 g C/kg H_(2)O,多年平均WUE_(year)的变化率为0.156 g C/(kg H_(2)O·10 a)。秦岭区域WUE_(year)总体呈现出不显著的上升趋势(p>0.05);秦岭区域不同植被覆盖下的多年平均WUE_(year)数值差异不大,但WUE_(year)的变化趋势略有不同,部分植被类型呈现上升趋势,而其他植被类型呈现下降趋势;多年平均逐月WUE_(month)变化多呈现较为明显的“双峰”模式。研究结果为不同类型生态系统水碳关系研究中获取和选择数据提供了依据和途径,加深了对秦岭区域生态系统WUE时空变化规律的认识,从而为研究气候变化对秦岭地区生态系统的影响提供了数据支持和科学参考。Through evaluating a few existing multi-source products of gross primary productivity(GPP)and evapotranspiration(ET),we constructed combined datasets of GPP and ET for the Qinling Mountains in China.Then,the spatial-temporal variations of water use efficiency(WUE)were calculated and analyzed for the Qinling Mountains.The results indicated that the estimation effects of different products of GPP and ET were very different for different vegetation types.Generally,the products of VPM GPP,RF GPP performed well for GPP estimation,while the products of China ET and PML-V2 ET performed well for ET estimation in China.In the Qinling Mountains,the average annual ecosystem GPP_(year) was about 1489.95 g C/m^(2);the average ET_(year) was about 588.49 mm;the average WUE_(year) was about 2.56 g C/kg H_(2)O;and the change rate of average WUE_(year) was about 0.156 g C/(kg H_(2)O·10 years).The values of average WUE_(year) showed a non-significant rising trend(p>0.05).The differences of annual average WUE_(year) were not great among different vegetation types.However,the trends of WUE_(year) changes were various for different vegetation types.Some vegetation types showed increasing trends,while others showed decreasing trends.The dynamics of average montly WUE_(month) had two obvious peaks per year.This study provided a reference for data acquirement and selection for the research of carbon-water relationships in different ecosystems.It also deepened our understanding of the temporal and spatial changes of ecosystem WUE in the Qinling Mountains in China.

关 键 词：总初级生产力 蒸散 多源产品 水分利用效率 秦岭 

分 类 号：S127[农业科学—农业基础科学]