水土保持通报2016，Vol.36Issue(6)：204-209,6.DOI:10.13961/j.cnki.stbctb.2016.06.035
青海湖流域植被的净初级生产力估算
Estimating Net Primary Productivity of Alpine Grassland in Qinghai Lake Basin
摘要
Abstract
[Ohjective] The net primary productivity(NPP) of vegetation from 2001 to 2011 in Qinghai Lake basin(QLB) was estimated quantitatively,and its space-time evolution characteristics were analyzed to provide a scientific basis for sustainable utilization of vegetation,ecological conservation and related policy making.[Methods] This paper estimated the NPP of Qinghai Lake basin grassland using carnegie-ames-stanford approach(CASA) model.[Results] (1) The average annual total NPP grassland in Qinghai Lake basin was 1.12×1013 g/a between 2001 and 2011,and the average per unit value was 168.03 g/(m2 · a).(2) NPP spatial distribution presented a pattern that it was higher in the southeast region,and lower in the northwest,similar pattern was observed for the hydro-thermal condition of the whole basin.Annual Qinghai Lake basin NPP showed an upward trend from 2001 to 2011.Annual increase rate of per unit value of grassland NPP was 1.74 g/(mz · a).The northeast and east part of the basin were the main increase area of NPP.(3) Also,there existed obvious seasonal variations of NPP in Qinghai Lake basin that the highest value appeared in July and the lowest was in January.The NPP from May to September accounted for 90.40％ of whole year.[Conclusion] CASA showed high accuracy for the simulation in our case.It well reflected the spatial distribution and time variation of the basin NPP.These implied that the improved CASA model is fea sible to be used for NPP simulation in the region without enough climate data,like that in our case.关键词
CASA模型/青海湖流域/净初级生产力(NPP)Key words
CASA model/Qinghai Lake basin/net primary productivity(NPP)分类
农业科技引用本文复制引用
乔凯,郭伟..青海湖流域植被的净初级生产力估算[J].水土保持通报,2016,36(6):204-209,6.基金项目
国家科技支撑计划项目“青海湖流域生态环境综合监测”(2012BAH31B03) （2012BAH31B03）
国家自然科学基金项目(41301007) （41301007）
中央高校科研支持计划(xjj2013079) （xjj2013079）
