生态学杂志2024，Vol.43Issue(6)：1841-1850,10.DOI:10.13292/j.1000-4890.202406.002
玉龙雪山及周边地区植被水分利用效率时空动态及其对scPDSI的响应
Spatiotemporal variation of water use efficiency in response to self-calibrating Palmer drought severity in-dex in Yulong Snow Mountain and surrounding areas,China
摘要
Abstract
Yulong Snow Mountain and its surrounding area a typical monsoon marine-like glacier region,which is the most suitable area for studying glacier change,geo-air energy exchange,vegetation community succession,and ecosystem carbon-water coupling.Water use efficiency(WUE)is an important parameter linking ecosystem water-carbon cycle and its response to climate factors.In this study,MODIS satellite remote sensing products[gross pri-mary productivity(GPP)and evapotranspiration(ET)]and self-calibrating Palmer drought severity index(scPD-SI)were used to analyze the spatial variation of WUE in Yulong Snow Mountain and its surrounding area from 2000 to 2020.The relationships between GPP,ET,WUE,and scPDSI were investigated,and the adaptation strategies of vegetations in different landforms to water use and stress were discussed.The results showed that during 2000-2020,the average WUE,GPP,and ET was 2.44 g C·m-2·mm-1,1365.0 g C·m-2,and 559.6 mm in the study area,respectively.The highest average WUE(2.88 g C·m-2·mm-1)was mainly distributed in intermediate relief and sub-high altitude mountains,and the lowest average WUE(1.23 g C·m-2·mm-1)was distributed in the high relief and extremely high altitude mountains.Due to the undulating terrain of Yulong Snow Mountain and the significant vertical zonal characteristics of vegetation,WUE increased with altitude below 3500 m,while de-creased with altitude above 3500 m.During 2000-2020,the monthly WUE presented a trend of increase-decrease-increase.The change rate of WUE was significantly different due to different geomorphological types.The WUE in large undulating mountains of Yulongxue Mountain and its surrounding area showed an increasing trend,while that of the middle elevation plain showed a decreasing trend.In the whole study area,there were seasonal variations for the response of WUE to drought stress.The monthly correlation between WUE and scPDSI showed a trend of nega-tive correlation-positive correlation-negative correlation-positive correlation,respectively.In the Yulong Snow Moun-tain area,WUE and scPDSI showed a significant positive correlation in July,but a negative correlation in May.There was a negative correlation between WUE and scPDSI from December to June of the following year,and a pos-itive correlation between July and August in the area around Yulong Snow Mountain.关键词
水分利用效率/时空动态特征/自适应帕尔默干旱指数(scPDSI)/相关性Key words
water use efficiency/spatiotemporal variation/self-calibrating Palmer drought severity index(scPD-SI)/correlation引用本文复制引用
李丽丽,杨永明,王大为,马兴刚,杜佳,卢铷萍,李永恒,王世金..玉龙雪山及周边地区植被水分利用效率时空动态及其对scPDSI的响应[J].生态学杂志,2024,43(6):1841-1850,10.基金项目
国家自然科学基金面上项目(32071606)、云南省基础研究计划面上项目(202301AT070084和202301AT070085)、云南省教育厅项目"云南省高校山地实景点云数据处理及应用重点实验室"和滇西应用技术大学人才引进科研启动项目(2022RCKY0003)资助. （32071606）
