雷竹林地土壤酶活性研究

为了了解目前雷竹林地土壤酶活性状况, 作者在1999 年春季采样分析了浙江省临安市郊4 个乡镇23 个雷竹户的竹林土壤。结果表明:雷竹地土壤酶活性变异较大, 23 块竹林土壤过氧化氢酶、蔗糖酶、磷酸酶、脲酶和蛋白酶活性的变异系数分别达到了33.37 %,71.00 %, 49.60 %, 39.90 %和28.08 %。蛋白酶活性与土壤有机质、水解氮、有效磷、速效钾、蔗糖酶和脲酶的相关系数分别为0.801 , 0.962 , 0.783 , 0.490 , 0.441 和0.845 , 说明蛋白酶是较理想的肥力指标。土壤磷酸酶活性与土壤有效磷的相关系数为-0.875 , 说明雷竹地磷肥用量过多。除磷酸酶外, 土壤各类酶活性和雷竹开花率和煤污病感病指数均呈负相关, 过氧化氢酶和蔗糖酶与竹子开花率负相关性达极显著水平。土壤生物学性质特别是过氧化氢酶和蔗糖酶活性可作为竹林退化指标。表6 参7

Study on enzyme activities of soil under Phyllostachys praecox f .prevelnalis forest

The study was conduced by sampling and analyzing 23 soils under Phyllostachys praecox f .prevelnalis forests which located across 4 villages and towns in Lin'an City in spring 1999 .The results show that the variation coefficients of enzyme activities are 33.37 %, 71.00 %, 49.60 %, 39.90 % and 28.08 % of hydrogen peroxidase , sucrase , phosphatase , urease and protease respectively .Protease activity has a good relation to soil organic matter , hydrolytic nitrogen , avaiable phosphorous , rapid potassium , sucrase and urease , and the correlation coefficients are 0.801 , 0.962 , 0.783 , 0.049 , 0.441 and 0.845 respectively .Protease activity could be a good index of soil fertility .Correlation coefficient between phosphatase and soil avaiable phosphorous is - 0.875 , indicating an excess of soil phosphorous .All enzyme activities except phosphatase has a negative relation to blossoming percentage of bamboo and sooty mould susceptibility index , among them peroxidase and sucrase are significant negative-related to blossoming percentage .Therefore , enzyme activities , especially peroxidase and sucrase activities , could be regard as an index of bamboo forest deterioration .