【摘要】 通过小区实验,分析了稻草覆盖与间作三叶草后的丘陵茶园土壤过氧化氢酶、脲酶、蔗糖酶、磷酸酶活性变化,并采用相关分析、通径分析、主成分分析探讨了酶活性和土壤养分的关系。结果表明:稻草覆盖与间作三叶草能显著提高丘陵茶园土壤有机质、全N及速效P、速效K含量,间作三叶草明显增加土壤过氧化氢酶、转化酶含量,而稻草覆盖明显增加磷酸酶和脲酶活性。相关分析表明,土壤过氧化氢酶、脲酶、蔗糖酶、磷酸酶均与全氮、有机质、速效N呈极显著或显著正相关。通径分析表明,与4种酶关系最直接的是有机质或全N。主成分分析表明,土壤过氧化氢酶、脲酶、蔗糖酶、磷酸酶活性在第1主成分内的权重分别为0.842、0.937、0.873和0.847,可见,过氧化氢酶、脲酶、蔗糖酶、磷酸酶活性可用于评价丘陵茶园土壤C、N肥力。更多还原

【Abstract】 A field plot experiment was conducted to study the changes in the soil catalase,urease,invertase,and acid phosphatase activities as well as the relationships between these enzyme activities and soil nutrient contents in a tea plantation under straw mulching and white clover intercropping. Mulching and intercropping increased the contents of soil organic matter,total N,and available N and P significantly,and intercropping increased soil catalase and invertase activities while mulching increased soil phosphatase and urease activities obviously. Soil catalase,urease,invertase,and phosphatase activities all had significant positive correlations with the contents of soil organic matter,total N,and available N. Path component analysis indicated that the test enzyme activities were most directly related to soil organic matter or total N content,and principal component analysis showed that the weight of soil catalase,urease,invertase,and acid phosphatase activities in the first main component was 0.842,0.937,0.873,and 0.847,respectively. It was suggested that soil catalase,urease,invertase,and acid phosphatase activities could be used to evaluate the soil C and N fertility in hilly tea plantations.更多还原