蒙古西部草原地上生物量的遥感估算

doi:10.7522/j.issn.1000-694X.2013.00082

摘要/Abstract

摘要：

利用2005—2011年内蒙古西部草原756个地面调查样方与2001—2011年MODIS-NDVI数据集,建立统计模型,估算了内蒙古西部草原地上生物量,并探索了地上生物量与气候因子的关系。结论如下：①内蒙古西部草原地上生物量2001—2011年均值为5.27 Tg（1 Tg=1012 g）。2001—2011年间,内蒙古西部草原地上生物量呈波动状态且略有下降趋势。②内蒙古西部草原地上生物量的空间差异显著,总体自东南向西北逐步降低。③内蒙古西部草原地上生物量年际波动的主要驱动因子是1—7月的降水量,而与同期气温无显著关系；降水量同样是决定地上生物量空间分布的重要因素,而气温的影响较弱。本研究的估值仍存在一定的不确定性,主要来源于样方的采集标准差异、样方生物量的折算偏差、灌木生物量的低估与遥感数据集误差。

关键词: 内蒙古西部, 草原, 归一化植被指数, 地上生物量, 气候因子

Abstract:

Using 756 field aboveground biomass (AGB) samples from the western Inner Mongolia grassland during 2005-2011, and MODIS-NDVI 16-day tiled product with a spatial resolution of 500 m×500 m during 2001-2011, we identified the size and distribution of aboveground biomass with statistic model and explored possible relationships between spatio-temporal pattern of AGB and climatic factors for the studied area. Results are summarized as follows: (1) AGB averaged 5.27 Tg in the western Inner Mongolia grassland during 2001-2011, experiencing a slight decrease trend. (2) AGB density exhibited a large spatial heterogeneity in the western Inner Mongolia grassland, and decreased from the southeast to the northwest. (3) AGB variation was in good accordance with inter-annual precipitation from January to July, but did not show a robust relationship with the temperature changes at the corresponding time. Precipitation was also a primarily determinant of the spatial pattern of AGB in the studied area, and the temperature might be a minor factor. However, the estimation has limitations due to uncertainties in the standards of field measurement, the uniform conversion factors that fresh grass yield converted to AGB (dry weight mass), underestimate of shrub biomass and satellite time series data sets.

Key words: western Inner Mongolia, grassland, NDVI, aboveground biomass, climatic factors

中图分类号:

S812

高添, 徐斌, 杨秀春, 金云翔, 马海龙, 李金亚, 于海达. 蒙古西部草原地上生物量的遥感估算[J]. 中国沙漠, 2013, 33(2): 597-603.

GAO Tian, XU Bin, YANG Xiu-chun, JIN Yun-xiang, MA Hai-long, LI Jin-ya, YU Hai-da. Estimation of Aboveground Biomass by Remote Sensing in the Western Inner Mongolia Grassland[J]. JOURNAL OF DESERT RESEARCH, 2013, 33(2): 597-603.

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