Pedosphere 12(4): 365--372, 2002
ISSN 1002-0160/CN 32-1315/P
©2002 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Preliminary study on biological characteristics of degraded soil ecosystems in dry hot valley of the Jinsha River |
YANG Wan-Qin 1, WANG Kai-Yun1, SONG Guang-Yu2 and HE Yu-Rong3 |
1 Chengdu Institute of Biology, the Chinese Academy of Sciences, Chengdu 610041 (China);
2 College of Resources and Environment, Southwest Agricultural University, Chongqing 400716 (China);
3 Institute of Mountain Hazards and Environment, the Chinese Academy of Sciences and Ministry of Water Conservancy, Chengdu 610041 (China) |
| ABSTRACT |
| Distribution characteristics of soil animals, microorganisms and enzymatic activity were studied in the dry red soil and Vertisol ecosystems with different degradation degrees in the Yuanmou dry hot valley of the Jinsha River, China. Results showed that Hymenoptera, Araneae and Collembola were the dominant groups of soil animals in the plots studied. The numbers of groups and individuals and density of soil animals in the dry red soil series were higher than those in the Vertisol series, and the numbers of individuals and density of soil animals decreased with the degree of soil degradation. Bacteria dominated microbiocoenosis not only in the dry red soils but also in the Vertisols. Microbial numbers of the dry red soil series were higher than those of Vertisol series, and decreased with the degree of soil degradation. The activities of catalase, invertase, urease and alkaline phosphatase declined with the degradation degree and showed a significant decline with depth in the profiles of both the dry red soils and Vertisols. Correlation among these soil bio-indicators was highly significant. |
| Key Words: degraded soil ecosystem, soil enzyme, soil fauna, soil microbes |
| Citation: Yang, W. Q., Wang, K. Y., Song, G. Y. and He, Y. R. 2002. Preliminary study on biological characteristics of degraded soil ecosystems in dry hot valley of the Jinsha River. Pedosphere. 12(4): 365-372. |
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