摘要
采用CASA模型估算洮河流域植被净初级生产力和降水利用效率,利用Sen斜率和相关性分析方法量化分析洮河流域2001-2010年植被降水利用效率的时空变化特征及气候关联.结果表明:2001-2010年洮河流域平均降水利用效率为0.73 g/(m^2·mm),青藏高原东北缘高于黄土高原西南缘;不同植被类型的降水利用效率差别较大,阔叶林最高,裸地最低;降水利用效率越高年际波动越明显.统计期间,流域降水利用效率整体表现出增长趋势,发生显著变化的区域主要分布于青藏片区中东部和黄土片区中北部;空间分析表明,洮河流域大部分区域的降水利用效率与降水量呈现较高的负相关性,两区相比,青藏片区更加显著.
The Carnegie-Ames-Stanford approach(CASA)was adopted to estimate the vegetative net primary production value,and the vegetative rain use efficiency(RUE)was calculated across the Tao River Basin in 2001-2010.Methods of Sen’s slope and correlation analysis were used to analyze the spatial and temporal variation of the RUE,together with the exploration of relationship to the key climatic factors.The results showed that the multi-yearly averaged RUE across the Tao River Basin was at a value level of 0.73 g/(m^2·mm),that in the area of Eastern Tibetan Plateau(ETP)was higher than that in the area of Southwestern Loess Plateau(SLP).The RUE of different vegetation types was quite different,the highest value was found in broad-leaved forest and the lowest one was found in the bare land.Series analysis resulted in fluctuation of the RUE values,the higher the RUE value,the more violent the fluctuation.During the statistical period,an overall increase of RUE was found in the whole basin.Regions where RUE presenting significant changes were mainly in the central-eastern ETP and the northern-central SLP.According to the correlation analysis,RUE showed remarkably negative correlation with annual precipitation.Influence of precipitation to RUE showed more in the ETP than that in the SLP.
作者
王刘明
张媛
武磊
魏健美
王帅兵
王万瑞
李常斌
Wang Liu-ming;Zhang Yuan;Wu Lei;Wei Jian-mei;Wang Shuai-bing;Wang Wan-rui;Li Chang-bin(Key Laboratory of Western China's Environmental Systems with the Ministry of Education,College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China;Center for Water Conservancy Planning and Technology Promotion of Hangzhou,the Bureau of Forestry and Water Conservancy in Hangzhou,Hangzhou 310014,China;State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Scienccs,Urumqi 830011,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第5期604-611,共8页
Journal of Lanzhou University(Natural Sciences)
基金
国家自然科学基金项目(41671017)
国家重点研究发展计划项目(2017YFC0504801,2017YFC0504306).
关键词
降水利用效率
净初级生产力
时空变化
洮河流域
vegetative rain use efficiency
net primary production
spatial-temporal variation
Tao River Basin
作者简介
通信联系人:李常斌(1976-),男,甘肃靖远人,教授,博士,博士研究生导师,e-mail:Ucb@lzu.edu.cn,研究方向为寒旱区流域科学与水资源
