Temporal and spatial patterns of emissions and pollutants from grassland burned in Inner Mongolia during 2005-2014

doi:10.11686/cyxb2016337

Abstract

Abstract: Fire is an important disturbance in ecosystems, and fires significantly affect the atmospheric environment and human health. Combining MODIS satellite data for the Inner Mongolia region during 2005-2014 and data from the Animal Husbandry Statistical Yearbook, we estimated the burnt biomass of regional grassland. The total emissions and spatial and temporal distribution of pollutants from grassland fires during 2005-2014 were also explored using emission factor, kernel density, and kriging interpolation methods. The results indicated that the density of burned grassland biomass differed within Inner Mongolia, decreasing from the northeast to the southwest parts of Inner Mongolia. The grassland fires were distributed unevenly, both spatially and temporally, in the study area. The grassland fires showed a stable annual growth and mainly occurred in March-April and September-October every year, showing two distinct peaks. Spatially, the distribution of fire point density gradually decreased from the northeast to the southwest parts of the study area. The proportions of total grassland fires in the various regions of Inner Mongolia were as follows: Hulun Buir (48.1%), Xing’an League (7.4%), Tongliao (2.8%), Chifeng (1.9%), Xilinguole (8.3%), Wulanchabu (3.8%), Baotou (4.3%), Hohhot (1.2%), Bayanzuoer (1.0%), Erdos (20.6%), Wuhai (0.3%), and Alashan (0.3%). During the period of 2005-2014, the total emissions of various substances were as follows: CO₂ (658.31 kt), CO (39.09 kt), NOx (846.18 t), CH₄ (1.22 kt), volatile organic compounds (1.87 kt), particulate matter smaller than 2.5 μm (2.49 kt), organic carbon (1.65 kt), and elemental carbon (197. 96 t). The emission of each type of pollutant varied spatially and temporally and was significantly correlated with the density distribution of fires. In this study, we explored the spatial and temporal dynamic changes in pollutants emitted from grassland fires in Inner Mongolia. This information will underpin further research on this regional environment by providing a robust database.

JIN Quan-Feng, JU Yuan-Hua, YANG Xia-Jie, WANG Wen-Hui, GUO Fu-Tao. Temporal and spatial patterns of emissions and pollutants from grassland burned in Inner Mongolia during 2005-2014[J]. Acta Prataculturae Sinica, 2017, 26(2): 21-29.

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