杉木幼林地土壤酶活性与土壤肥力

Soil Enzyme Activity and Soil Fertility in Cunninghamia lanceolata Plantation

杉木[Cunninghamia lanceolata(Lamb.)Hook.]是我国南力主要的用材树种之一,杉木人工林面积占全国人工林面积24％。研究杉木人工林土壤肥力特性有重要意义。土壤酶参与土壤中各种生物化学过程和物质循环,其活性可以反映土壤生物化学过程的强度与力向,还可以客观地反映土壤肥力状况。本文以阔叶杂木林为对照,探讨了杉木幼林地土壤酶活性与土壤肥力的关系以及在土壤营养物质转化过程中的作用,为杉木人工林土壤改良、低产林分的改造提供理论依据。

The relationship of enzyme activities and chemical properties in Cunninghamia lanceolata plantation in comparison with the broad-leaves forest were studied. The results indicated that: (1) there is a close correlation between enzyme activities and chemical properties of the soil of the plantation, a negative significant correlation between polyphenol oxidase activity and organic matter, total N, organic P, and a positive significant correlation between acid, neutral phosphatase,urease,invertase, catalase activities and various chemical properties of the soils. Soil enzyme activity might be used as indexes to characterize the status of soil fertility; (2) there is a significant correlation among the soil enzymes; (3) the transformation of some soil organic substances were only concerned with specific enzyme activities. (4) there is a significant difference of soil enzyme activities under different forests. Successive cropping of Cunninghamia lanceolata increased catalase, peroxidase activities and reduced polyphenol oxidase activity.