大兴安岭兴安落叶松林土壤酶活性研究

ACTIVITIES OF SOIL ENZYME IN Larix gmelinii FOREST OF DAXINGAN MOUNTAINS

研究了内蒙古大兴安岭杜香-兴安落叶松林(LLV)、草类-兴安落叶松林(HLV)、柴桦-兴安落叶松林(BLV)土壤过氧化氢酶、蔗糖酶、脲酶、蛋白酶、酸性磷酸酶活性季节动态和垂直变化规律。3种林型下土壤酶活性具有明显的季节变化特点,其动态趋势是酶活性先增加后降低,以7月达最大值,即7月酶活性>5月、9月酶活性。土壤蔗糖酶活性5月在LLV、BLV与HLV样地间差异性显著,7月LLV与HLV样地间差异性显著(P<0.05)。5种土壤酶活性垂直变化规律是随着土层深度的增加,酶活性逐渐降低,表现为0cm-10cm层>10cm-20cm层>20cm-30cm层。

Seasonal dynamics and vertical changes of soil enzyme activities（including catalase,invertase,urease,protease and acid phosphatase） are studied in Ledum palustre-Larix gmelinii virgin forest,Herbage-L.gmelinii virgin forest,Betula-L.gmelinii virgin forest of Inner Mongolia Great Xingan Mountains.Under three vegetations soil enzyme activities have obvious seasonal variation,at first soil enzyme activities are increasing and then decreasing,reach the highest peak in July,follow orders： JulyMay and September.The activities of invertase have obvious differences both LLV,BLV and HLV in May,invertase activity of LLV and HLV have obvious differences in July.The activities of soil enzymes are gradual lower with the increasing in vertical depth,follow orders： 0-10cm layer10-20cm layer20-30cm layer.