Spatial and temporal dynamic changes of net primary product basedon MODIS vegetation index in Gannan grassland

Abstract

Abstract: Dry matter yield information from field surveying quadrats and MODIS vegetation index data in Gannan Prefecture during 2006-2007 were used to construct a remote sensing monitoring model for aboveground dry matter biomass of grassland. The net primary product (NPP) of grassland was estimated and used to, complete the spatial distribution maps of annual NPP accumulation and monthly NPP dynamic changes, and to evaluate the NPP difference between various grassland vegetation types. The annual maximum NPP of grassland in Gannan Prefecture during 2006-2008 were 637.04, 599.98 and 566.59 g C/(m²·a), respectively. The distribution of annual maximum NPP has a trend of gradual reduction from southwest to northeast and the yearly maximum NPP accumulation of all grassland types was in July and August. The three grassland types with the highest NPP accumulation were marsh, alpine shrub meadow, and alpine meadow, with monthly maximum NPP values of 1 137.28, 553.76 and 527.66 g C/m², respectively (mean values for the three years). The grassland NPP in Gannan Prefecture was continuously decreasing over the three years, with an annual reduction forthe total grassland of 1.2 Tg/a. The reduction of marsh NPP is especially significant, with an annual rate of 125.92 g C/(m²·a).

CLC Number:

S812-05
S12

WANG Ying, XIA Wen-tao, LIANG Tian-gang, WANG Chao. Spatial and temporal dynamic changes of net primary product basedon MODIS vegetation index in Gannan grassland[J]. Acta Prataculturae Sinica, 2010, 19(1): 201-210.

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