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| Effects of reconstruction of low-benefit stands on the soil physical and chemical properties and water conservation function |
| Wang Huili1,Tang Yugui1,Wei Jiaomei2 |
| 1.Guangxi Academy of Forestry Sciences,530001;2.Forestry College of Guangxi University,530004: Nanning,China |
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Abstract Soil physical and chemical properties and water conservation function of five forest stands was investigated in Changwu County,Guangxi Province,including two low-benefit stands(Pinus massoniana stand and Pinus elliottii stand),and three reformed mixed stands(mixed stand of Pinus massoniana and Schima superba,mixed stand of Pinus elliottii and Schima superba,mixed stand of Pinus elliottii and Castanopsis fissa).The results show as the follows: 1) Compared with low-benefit stands,reformed mixed stands show a significant increase in soil mineral elements contents and physical properties.2) The water status and soil percolation capacity have a significant increase in reformed mixed stands than that in low-benefit stands.3) Compared with Pinus massoniana stand(2166t/hm2) and Pinus elliottii stand(2075t/hm2),there are significant improvement in water conservation function in reformed mixed stands.The water storage amount of mixed stand of Pinus massoniana and Schima superba is 2543t/hm2,2506t/hm2 in the mixed stand of Pinus elliottii and Schima superba,and 2483t/hm2 in the mixed stand of Pinus elliottii and Castanopsis fissa.4) Magnitude of the increases of soil physical and chemical properties vary with soil depth,being larger in the 0-20cm layer than 20-40cm layer.Soil nutrition,physical properties and water conservation function are significantly improved in three reformed mixed stands.It is one of the effective measures to reconstruction for low-benefit stands that Schima superba or Castanopsis fissa is planted in low-benefit stands.
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Received: 28 September 2010
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