Pedosphere 9(3): 205--212, 1999
ISSN 1002-0160/CN 32-1315/P
©1999 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Fertility restoration of red soils in low-hilly region of middle subtropical China
SUN Bo, ZHANG Tao-Lin and ZHAO Qi-Guo
Institute of Soil Science, the Chinese Academy of Sciences, P. O. Box 821, Nanjing 210008 (China)
ABSTRACT
      There are about 1.27 million ha of upland red soils derived from Quaternary red clay facing the degradation in the low-hilly region of the middle subtropical China. From the aspects of chemistry, physics and microbiology, the processes of soil fertility restoration in the surface layer (0~20 cm) under three types of land use patterns (i.e. citrus orchard, tea garden and upland) in two provinces were studied in this work. Results showed that the reclamation of eroded waste land improved most of soil properties. Soil organic matter, total N and P, available P and K, and exchangeable Ca and Mg increased, but soil total K and exchangeable Al decreased. Soil pH decreased by 0.5 unit in the pure tea plantation for 20 years. Soil reclamation increased the percentage of soil microaggregates (<0.25 mm), especially those with a diameter of 0.02~0.002 mm. Soil total porosity increased in the cultivated lands with the increase of soil aeration and capillary porosity. The number of soil microorganisms increased with reclamation caused mainly by the huge increase of the total amount of bacteria. With the cultivation, the activity of soil urease and acid phosphatase increased, but that of invertase dropped.
Key Words:  fertility, low-hilly region, red soils, restoration, subtropical China
Citation: Sun, B., Zhang, T. L. and Zhao, Q. G. 1999. Fertility restoration of red soils in low-hilly region of middle subtropical China. Pedosphere. 9(3): 205-212.
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