Pedosphere 15(1): 95--102, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Impacts of Choerospondias axillaris growth on acidity of udic ferrosols in subtropical China
LI Qing-Man1,3, WANG Xing-Xiang2 and BI Shu-Ping3
1 Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430078 (China). E-mail: gmli@ihb.ac.cn
2 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
3 Department of Chemistry, Nanjing University, Nanjing 210093 (China)
ABSTRACT
      Changes in acidity of Udic Ferrosols, caused by growth of Choerospondias axillaris (Roxb.) Burtt et Hill, in comparison to wild grass, were investigated for pH distribution in the soil profile, exchangeable acidity, and cation status in the soil leachate of a simulated leaching experiment. Soils were sampled in profiles at 5 cm intervals to a depth of 100 cm. In the 15-60 cm layer the soils with 10-year old C. axillaris had significantly lower pH (P < 0.05), with the largest difference being 0.41; and in the 25-75 cm soil depths, especially in the 30-55 cm layer, the soils had a significantly higher exchangeable acidity, ranging 1.93 to 3.02 cmolc kg-1. There was also higher aluminum, potassium, and sodium contents in the soil leachate under C. axillaris than with wild grasses. This suggested that the growth of C. axillaris accelerated acidification of Udic Ferrosols and promoted soil clay mineral weathering.
Key Words:  acidification, Choerospondias axillaris, Udic Ferrosols
Citation: Li, Q. M., Wang, X. X. and Bi, S. P. 2005. Impacts of Choerospondias axillaris growth on acidity of udic ferrosols in subtropical China. Pedosphere. 15(1): 95-102.
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