关键词: 巨桉人工林生态系统, 根系土壤, 土壤养分, 酶活性, 根际效应

Abstract: The experiment studied the rhizosphere and non-rhizosphere soil enzyme activity in Eucaly ptusgrandis plantation ecosystem of Hongya county. The results are as follows:Eucalyptus grandis plantation had a large rhizosphere effect, R/S is between 1 and 2;three enzymes activities had an obviously seasonal change that is, sucrase and urease activity were the highest in summer and the lowest in spring, while catalase activity was the highest in autumn and the lowest in spring;three enzymes activities had a coherently vertical distribution, the deeper the soil, the lower the enzyme activity;there was no decrease of fertility in Eucalyptus grandis plantation of Hongya county, many factors were better than Quercus acutissima;there were some relations between rhizosphere soil enzyme and rhizosphere soil fertility, except the urease and catalase were negatively correlated to available K, the other biological factors were positively correlated to nutrients factors, most of which were extremely significantly correlated to biological factors.

Key words: Eucalyptus grandis plantation ecosystem, rhizosphere soil, soil nutrient, enzyme activity, rhizosphere effect