Chinese Journal of Agrometeorology

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Seasonal Dynamics Model of Aboveground Biomass and Leaf Area Index on Alpine Kobresia humilis Meadow in Qinghai-Tibet Plateau

SUN Jian-wen1,2,LI Ying-nian1,3 ,SONG Cheng-gang1,2,WANG Jian-lei1,2,ZHANG Fa-wei1,3,WANG Qin-xue4(1.Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810001,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049;3. Key Laboratory of Adaptation and Evolution of Plateau Biota,Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810001;4.National Institute for Environmental Studies,Tsukuba,Ibaraki 3050053,Japan)   

  • Online:2010-04-10 Published:2010-04-10

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Abstract: Based on the alpine Kobresia humilis meadow vegetation and weather data obtained at Haibei Alpine Meadow Ecosystem Research Station,CAS in 2007,we discussed the seasonal dynamic changes of the Leaf Area Index (LAI) and Aboveground Biomass (AB),analyzed and simulated the correlation between LAI and AB,as well as the influence of climate on the process of LAI and AB. The results showed that during the plant growing season,the seasonal dynamic variation of AB could be fitted by the Logistic Regression model,and the seasonal dynamic variation of LAI could be fitted perfectly by cubic function LAI showed significant correlation with temperature and precipitation and they could be modeled by a binary quadratic function. The relationship of LAI and AB could be stated with a quadratic function.

Key words: Alpine Kobresia humilis meadow, Alpine Kobresia humilis meadow, Leaf area index (LAI), Aboveground biomass(AB), Seasonal dynamic variation