湖北林业科技

Abstracts:In order to provide the theoretical basis for the successive Cunninghamia lanceolata plantation management and sustainable development,rhizosphere and nonrhizosphere soil properties between the first and the second generation Cunninghamia lanceolata plantation in Guangxi were studied though the pair method.Results showed that the pH value,the contents of soil organic matter, total nitrogen,total phosphorus, alkali solution nitrogen, available phosphorus,available potassium, exchange of calcium ion, available Fe and available Mn of the second generation Cunninghamia lanceolata plantation was higher than the frist one, thoes nutrient content of rhizosphere soil(R) was higher than nonrhizosphere soil(S),but the content of soil total K has an opposite trend. Continuously planting has a certain influence on soil enzyme activity, soil nutrient content and microbial.The second generation in the soil enzyme activity was higher than the first one, rhizosphere soil enzyme activities values were higher than the nonrhizosphere soil.Whether the rhizosphere soil or nonrhizosphere soil,the dominant species of soil microbes was bacteria.The proportion of microbes,the proportion of bacteria,the proportion of actinomycetes and the proportion of fungi showed that the first generation of forest soil>the second generation of forest soil; The proportion of bacteria decreased with continuousplanting rotation decreasing,but the proportion of actinomycetes showed a increasing tend.