不同林木凋落物分解对土壤性质的影响

杉木、马尾松和檫树３种林木凋落物室内混土培养的结果表明：杉木、马尾松凋落物分解造成土壤ＰＨ值下降；杉木凋落物的分解还使土壤水解氮和有效磷缺乏，耐檫树和马松处理则能提供比对照更多的有效养分。３类凋落物分解均能显著增加过氧化氢酶、脲酶、纤维麦和多酚氧化酶的活性，其中檫树处理的过氧化氢酶和脲酶活性最强，杉木凋落物并未使土壤多酚氧化酶活性高于其他处理，但它能很好激活纤维素酶的活性。

Effects of Litter Decomposition of Different Stands on Soil Properties.

This experiment was done by culturing the mixture of soil with litter of Cunninghamia lanceolata, Pinus massioiana and Sassafras tzumu in incubator bespectively. The results showed that the pH values of soil decreased due to the littter ofS. tzumu and P. massoniana. Deficiency of hydrolyzable nitrogen and available phosphate occurred under the treatment ofC. lanceolata. On the contrary, the litter of S. tzumu and P. massoniana provided more available untrients for soil than control. Three kinds of litter could greatly activate hydrogen peroxidase,urease,cellulase and polyphenol oxidase.The hydrogen peroxidase and urease were activated most by S. tzumu litter. The of C. lanceolata did not activate polyphenol oxidase compared with the other treatment,however,it acted well on cellulase.