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| Effects of closing measures on community structure of soil and water conservation forest of Protruding Eucalyptus |
| Fang Daiyou, Zhu Dongwei, Yang Fuquan |
| Institute of Soil and Water Conservation of Maoming City in Guangdong Province, 525029, Maoming, Guangdong, China |
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Abstract In order to open out effects of closing measures on community structure of Protruding Eucalyptus forest, some factors of three plots of soil and water conservation forest community of Protruding Eucalyptus under different closing and protective term were investigated, contrasted and analyzed, which include vegetable species, biomass, soil fertility, edaphon and existing amount of withering matter, and those plots located in Xiaoliang soil and water conservation station of Maoming city, Guangdong province. The results showed that with closing measures, existing amount of withering matter under forest and soil fertility increased rapidly, condition of soil moisture and fertility were improved, and development of community structure was accelerated. Existing amount of withering matter of Protruding Eucalyptus forest closed 20 years was 1 103.4 g/m2, soil organic matter content was 1.871 25% , which was 4.69 times and 4.15 times higher than that of not being closed, and which was 1.04 times and 1.01 times higher than that of being closed 10 years. The Protruding Eucalyptus forest closed 20 years had obvious three vertical structures of timber forest, shrub and grass. Timber forest had sub-layer besides Protruding Eucalyptus . That closed 10 years had clear shrub and grass layer too. However, The Protruding Eucalyptus forest which was not being protected had only single timber layer. The biomass of Protruding Eucalyptus forest being closed 20 years was 347.841 kg/m2,which was 1.17 times higher than that of being closed 10 years, and 1.53 times higher than that of no being closed.
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Received: 13 December 2004
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