A Study on Soil Enzyme Characteristics of Rehabilitated Forest in Seriously Eroded Quarternary Red Clay Region

This paper takes seriously eroded red soil region located in Taihe County of Jiangxi Province as the object of the study . In 2001, according to the studies on the activity of 5 soil enzymes(proteinase, urease, sucrase, catalase and acid phosphatase) of the forest rehabilitated in different models in 1991, (1) the soil enzyme activity of the rehabilitated forests in 8 models can be divided into 3 groups by PCA; (2)all of the 5 enzymes' activity decline step by step with the increase of soil depth, but the degrees have obvious difference among different enzymes and among different rehabilitated forests; the greatest variance of sucrase enzyme activity among the soils at different depths is the soil of the broadleaved forest, the variance of urease activity of the broadleaved forest soil and mixed forest soil is greater than that of the conifers forest, and the variance of catalase activity of all kinds of forests is more accordant than that of other enzymes; (3)in seasonal variance of soil enzyme activity, urease activity has the greatest variance with an average of 62.32%, and proteinase activity has the smallest variance with an average of 13.04%; (4)the relationship between soil enzyme activity and microbial characteristics is obvious, espeacially the relationship between soil respiratory intensity and the activity of the 5 enzymes, which is extreme.