毛竹竹根区土壤微生物数量与酶活性研究

采样分析了毛竹竹根区土壤微生物数量和酶活性。结果表明：毛竹竹根区土壤细菌数量明显多于林间土，其R／S值（土壤酶活性比值）平均为1．53；从不同年龄竹来看，Ⅰ、Ⅱ度竹竹根区细菌数量多于Ⅲ度竹。毛竹竹根区土壤真菌数量也明显多于林间土，R／S值平均为2．05；其中Ⅱ度竹竹根区真菌数量显著多于Ⅰ、Ⅲ度竹根区，差异达显著水平。放线菌数量无论是毛竹竹根区与林间土之间还是不同年龄毛竹竹根区土之间均无明显不同。毛竹竹根区土壤过氧化氢酶、脲酶和蔗糖酶的活性明显高于林间土，R／S值分别平均为1.28、1.48、和1．94，但在Ⅰ、Ⅱ、Ⅲ度竹竹根区之间这3类酶的活性无明显差异。毛竹竹根区土壤蛋白酶和磷酸酶的活性也明显高于林间土，其R／S值分别平均为2．00和1．82，并且蛋白酶活性Ⅱ度竹竹根区明显高于Ⅰ、Ⅲ度竹竹根区，磷酸酶活性Ⅱ度竹竹根区也显著高于Ⅲ度竹竹根区，差异均达显著水平。

Study on the Microbe Quantity and Enzymatic Activity in Rhizospheric and Non-rhizospheric Soil under Phyllostachyspubescens Forest

The sampling method was used to analyze the microbe quantity and enzymatic activity in rhizospheric soil of Phyllostachys pubescens. The results showed that the quantity of bacteria in rhizosphere was more than that in non rhizosphere, the R/S value was 1 53 in average. For the bamboo stand with different age, the quantity of microbe and enzymatic activity in rhizosphere under 1 and 3 year old stand was higher than that under 5 year old stand. The quantity of fungi followed the same pattern (R/S 2 05), but the quantity of fungi in rhizosphere under 3 year old stand was more than that under 1 year old stand. No distinct difference was found about the quantity of actinomyces between rhizosphere and non rhizosphere or among stands with different ages. The activities of hydrogen peroxidase, urease and sucrase were higher in rhizosphere than in non rhizosphere, and the R/S values were 1 28, 1 48 and 1 94 respectively. However, no significant difference was found among various ages of bamboo stand. The activities of protease and phosphatase were also higher in rhizosphere than in non rhizosphere, and the R/S values were 2 00 and 1 82 respectively. Protease activity of rhizosphere under 3 year old stand was higher than that under 1 and 5 year old stand. The difference of phosphatase activity in rhizosphere and non rhizosphere also existed for both 3 and 5 year old stands.