杉木根际土壤特性的研究——(Ⅰ)杉木根际与非根际土壤化学性质的比较研究

本文比较分析了杉木根际土壤和非根际土壤的一些化学性质,并探讨了杉木连栽对这些性质和林木生长的影响。结果表明,杉木根际土壤的有机质、全氮、速效磷含量显著地高于非根际土壤,速效钾含量则相反。根际土壤的C/N较高,而pH则有降低的趋势。杉木连栽在不同程度上会降低根际和非根际土壤有机质、N,P,K含量和土壤pH,导致土壤养分状况和根际环境的恶化,从而使连栽杉木生长受阻。

Studies on Soil Characteristics in the Root Zone of Chinese Fir. I Comparative Study of Soil Chemical Properties Between the Rhizosphere and the Bulk Soil.

Some chemical properties of soil between the root zone of Chinese fir and bulk soil were analysed, and effects of Chinese fir succession on the properties and tree growth were studied. There existed a signifcant difference in content of organic matter, total N, soluble P and K between the rhizosphere and bulk soil. The content of organic matter, total N and soluble P in the rhizosphere soil were higher than those in the bulk soil, and soluble K content of the former was lower than that of the latter. The C/N of the rhizosphere soil was higher than that of the bulk soil, implying lower N content in organic matter of the former. The pH of the rhizosphere soil tended to be lower than that of the bulk soil. The successive planting of Chinese fir caused decreasing of the organic matter, N, P, K and pH in the rhizosphere and bulk soil to a certain degree, and worsening of the rhizosphere surrounding. This was one of the factors which reduced the growth rate of Chinese fir.