Pedosphere 19(2): 258--264, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Soil organic carbon and its fractions across vegetation types: Effects of soil mineral surface area and Microaggregates |
WU Qing-Biao 1,2, ANG Xiao-Ke2 and OUYANG Zhi-Yun2 |
1 Forestry College of Guangxi University, Nanning 530004 (China). E-mail:wuqb2003@yahoo.com.cn;
2 Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085 (China) |
| ABSTRACT |
| Soil organic carbon (SOC)can act as a sink or source of atmospheric carbon dioxide;therefore, it is important to understand the amount and composition of SOC in terrestrial ecosystems, the spatial variation in SOC, and the underlying mechanisms that stabilize SOC. In this study, density fractionation and acid hydrolysis were used to assess the spatial variation in SOC, the heavy fraction of organic carbon (HFOC), and the resistant organic carbon (ROC) in soils of the southern Hulun Buir region, northeastern China, and to identify the major factors that contribute to this variation. The results showed that as the contents of clay and silt particles (0-50μm)increased, both methylene blue (MB) adsorption by soil minerals and microaggregate contents increased in the 0-20 and 20-40 cm soil layers (P < 0.05). Although varying with vegetation types, SOC, HFOC, and ROC contents increased significantly with the content of clay and silt particles, MB adsorption by soil minerals, and microaggregate content (P < 0.05), suggesting that soil texture, the MB adsorption by soil minerals, and microaggregate abundance might be important factors influencing the spatial heterogeneity of carbon contents in soils of the southern Hulun Buir region. |
| Key Words: carbon fractions, microaggregates, soil mineral surface area, soil organic carbon, vegetation |
| Citation: Wu, Q. B., Wang, X. K. and Ouyang, Z. Y. 2009. Soil organic carbon and its fractions across vegetation types: Effects of soil mineral surface area and Microaggregates. Pedosphere. 19(2): 258-264. |
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