Pedosphere 24(3): 391--398, 2014
ISSN 1002-0160/CN 32-1315/P
©2014 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Carbon and nitrogen storage in Inner Mongolian grasslands: Relationships with climate and soil texture |
HE Nian-Peng1, WANG Ruo-Meng1, ZHANG Yun-Hai2 and CHEN Quan-Sheng2 |
1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101 (China)
2State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093 (China) |
| ABSTRACT |
| Understanding the spatial variability of soil carbon (C) storage and its relationship with climate and soil texture is critical for developing regional C models and for predicting the potential impact of climate change on soil C storage. On the basis of soil data from a transect across the Inner Mongolian grasslands, we determined the quantitative relationships of C and nitrogen (N) in bulk soil and particle-size fractions (sand, silt, and clay) with climate and soil texture to evaluate the major factors controlling soil C and N storage and to predict the effect of climate changes on soil C and N storage. The contents of C and N in the bulk soil and the different fractions in the 0–20 and 20–40 cm soil layers were positively correlated with the mean annual precipitation (MAP) and negatively correlated with the mean annual temperature (MAT). The responses of C storage in the soil and particle-size fractions to MAP and MAT were more sensitive in the 0–20 cm than in the 20–40 cm soil layer. Although MAP and MAT were both important factors influencing soil C storage, the models that include only MAP could well explain the variation in soil C storage in the Inner Mongolian grasslands. Because of the high correlation between MAP and MAT in the region, the models including MAT did not significantly enhance the model precision.Moreover, the contribution of the fine fraction (silt and clay) to the variation in soil C storage was rather small because of the very low fine fraction content in the Inner Mongolian grasslands. |
| Key Words: mean annual precipitation, mean annual temperature, native grassland, particle-size fraction, soil organic matter |
| Citation: He, N. P., Wang, R. M., Zhang, Y. H. and Chen, Q. S. 2014. Carbon and nitrogen storage in Inner Mongolian grasslands: Relationships with climate and soil texture. Pedosphere. 24(3): 391-398. |
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