Remotely sensed dynamics monitoring of grassland aboveground biomass and carrying capacityduring 2001-2008 in Gannan pastoral area

Abstract

Abstract: Monitoring grassland aboveground biomass (GAB) is not only an important content for the research of spatial patterns of grassland resources, but is also a basis for the integration analysis of the balance between grassland forage supply and livestock demand. Grassland investigation data from 2006-2008 and Terra/MODIS (Moderate-resolution Imaging Spectroradiometer) daily surface reflectance product of MOD09GA in Gannan pastoral area, were used to establish both a monitoring model of GAB, and the 10-day, monthly and yearly dynamics of biomass and theoretical livestock carrying capacity during 2001-2008 in Gannan Prefecture. And each county was simulated and analyzed. Results suggested that the power function of MODIS-EVI (Enhanced Vegetation Index) can best simulate the green yield of GAB in Gannan pastoral area. The mean precision of the monitoring model was 76.7%, which might simulate the GAB dynamics in the period from May to October when the grassland was at a good growing stage. It mainly concentrated in the period from the first 10-days of May to the third 10-days of October during the grassland growth time. During this period digital images of the maximum GAB in a 10-day period may objectively reflect the general rule of grassland growth, but a few of the digital images of the maximum GAB were severely affected by rainy or cloudy weather condition which lasted a long time and covered a large scale, with a considerable change in the quantity of grazing livestock. The dynamic curve of the monthly maximum GAB for each grassland type during 2001-2008 was characterized by a unimodal parabola form. The average maximum GAB appeared in July, but the month that the GAB reached the maximum value varied from year to year, mainly in the period from July to August. There were great differences in the overall biomasses in different years in the Gannan pastoral area. The average overall biomass during those years in the overall Prefecture was 109.31×10⁸ kg. The highest value appeared in 2005 (129.1×10⁸ kg), followed by 2006 and 2007, which reached 113.2×10⁸, 110.7×10⁸, and 109.0×10⁸ kg, respectively. Due to the differences of weather condition, grassland area and growth situation, there was a significant difference for the theoretical livestock carrying capacity in each county.

CLC Number:

S127
S812

LIANG Tian-gang, CUI Xia, FENG Qi-sheng, WANG Ying, XIA Wen-tao. Remotely sensed dynamics monitoring of grassland aboveground biomass and carrying capacityduring 2001-2008 in Gannan pastoral area[J]. Acta Prataculturae Sinica, 2009, 18(6): 12-22.

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