Soil organic and inorganic carbon contents under various land uses across a transect of continental steppes in Inner Mongolia

A huge amount of soil organic and inorganic carbon (SOC and SIC) is stored in soils and those stored carbon (C) plays an important role in affecting the global climate change. Knowledge on the spatial distribution of and land management effects on soil C in the Eurasian steppes is essential for unde...

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Bibliographic Details
Published in:Catena (Giessen) 2013-10, Vol.109, p.110-117
Main Authors: Wang, Zhi-Ping, Han, Xing-Guo, Chang, Scott X., Wang, Bin, Yu, Qiang, Hou, Long-Yu, Li, Ling-Hao
Format: Article
Language:English
Subjects:
Asia
Bgi / Prodig
Carbon
carbon sequestration
China
Climate change
Cultivation
Freshwater
Land
Land cultivation
land use
meadows
Northern China
organic soils
Particle-size fraction
Physical geography
plateaus
sandy soils
Soil (material)
soil depth
Soil layer
soil organic carbon
soil texture
Spatial distribution
Steppes
Surface layer
Temperate grassland
temperature
Texture
watersheds
wetlands
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Summary:A huge amount of soil organic and inorganic carbon (SOC and SIC) is stored in soils and those stored carbon (C) plays an important role in affecting the global climate change. Knowledge on the spatial distribution of and land management effects on soil C in the Eurasian steppes is essential for understanding its impact on the global climate change. We investigated both the distribution of SOC and SIC contents and the effect of land cultivation on SOC content across a transect of continental steppes in Inner Mongolia, including the western plateau and the eastern plain. There were weak increasing trends in SOC and SIC from west to east across the transect. In general, SOC decreased but SIC increased with increasing soil depth. Both SOC and SIC were markedly different among various land uses in the Xilin River basin, approximately located in the center of the studied continental steppes. Grasslands and meadows together accounted for 93.9 and 98.1%, respectively, of the total SOC and SIC storages in the basin, whereas wetlands played an insignificant role in soil C storage due to both their small area and sandy soil texture. Land cultivation caused losses of 7.7 and 18.1% of SOC in the 0–10cm soil layer on the western plateau and the eastern plain, respectively. The loss of SOC mainly occurred in the coarse-size fraction (>0.25mm) in the surface 0–10cm soil layer. Sandy soil texture, low mean annual temperature and infrequent land cultivation somewhat limited the loss of SOC in the continental steppes. [Display omitted] •Soil carbon was surveyed in the continental steppes in Inner Mongolia.•Soils were sampled and analyzed for organic and inorganic carbon.•Soil carbon had weak increasing trends across the continental steppes.•Soil carbon was markedly different in various land uses.•Land cultivation caused a slight to moderate loss of SOC in the continental steppes.
ISSN:0341-8162
1872-6887
DOI:10.1016/j.catena.2013.04.008