[Grassland net primary productivity and its spatiotemporal distribution in northern Tibet: a study with CASA model].
Publication/Presentation Date
11-1-2007
Abstract
Based on the remote sensing data, meteorological data and other related data from 1981 to 2004, the grassland net primary productivity (NPP) and its spatiotemporal distribution in Northern Tibet were analyzed by CASA (Carnegie-Ames-Stanford Approach) model. The results indicated that in the study area, the spatial distribution of grassland NPP was affected by the local water and heat conditions, and represented a horizontal zonality. From southeast to northwest, the grassland NPP reduced from 230 g C x m(-2) x a(-1) to near 0 g C x m(-2) x a(-1). The overall level of grassland NPP in Northern Tibet was rather low, with the multi-years average value of total NPP being 21.3 x 10(12) g C x a(-1) and the mean value of NPP being 48.1 g C x m(-2) x a(-1), which were obviously lower than those in Qinghai-Tibetan Plateau and other grassland areas of China. The mean values of NPP on flat land (slope gradient <1 >degree) and south slope were relatively lower. On the main alpine grasslands in Northern Tibet, the NPP from July to September occupied 64.0%-70.0% of the whole year. From 1981 to 2004, the grassland NPP within the whole Northern Tibet had a greater annual fluctuation, and tended to further reduce.
Volume
18
Issue
11
First Page
2526
Last Page
2532
ISSN
1001-9332
Published In/Presented At
Gao, Q. Z., Wan, Y. F., Li, Y. E., Lin, E. D., Yang, K., Jiangcun, W. Z., Wang, B. S., & Li, W. F. (2007). Ying yong sheng tai xue bao = The journal of applied ecology, 18(11), 2526–2532.
Disciplines
Medicine and Health Sciences
PubMedID
18260459
Department(s)
Department of Pathology and Laboratory Medicine
Document Type
Article