三江平原不同类型湿地土壤酶活性及其与营养环境的关系

对三江平原3种典型湿地(毛苔草湿地、小叶章湿地、岛状林湿地)的土壤酶活性、土壤养分进行了研究,探讨了不同湿地土壤酶与土壤养分及酶活性间的相关性。结果表明:不同湿地土壤酶活性和土壤养分含量有较大差异。土壤蔗糖酶、脲酶、过氧化氢酶、淀粉酶活性与土壤有机质、全氮、碱解氮含量变化趋势一致,表现为毛苔草湿地>小叶章湿地>岛状林湿地。酸性磷酸酶活性表现为岛状林湿地>毛苔草湿地>小叶章湿地;纤维素酶活性则表现为毛苔草湿地>岛状林湿地>小叶章湿地。经分析,土壤酶活性和养分密切相关,且酶活性间存在一定的相关关系,其中脲酶、过氧化氢酶、淀粉酶活性与土壤养分相关性最好,呈显著或极显著正相关。并且这3种酶活性之间也呈显著或极显著正相关,因此脲酶、过氧化氢酶、淀粉酶活性可以作为该地区较为理想的湿地营养状况的表征指标。

Soil Enzyme Activity and Its Relationship with the Soil Nutrient Environment of Different Types Wetland in Sanjiang Plain

The soil enzyme activities and nutrients of three types of wetland(Carex lasiocarpa,Calamagrostis angustifolia and island forest wetlands) in Sanjiang Plain were investigated.And the relationship between soil enzyme activity and nutrients and the relationship among enzyme activities were discussed.The results indicated that soil enzyme activity and nutrients differed obviously among different wetlands in Sanjiang Plain.The content of soil organic matter,total nitrogen and available nitrogen were in the order of Carex lasiocarpa wetland>Calamagrostis angustifolia wetland >island forest wetland.And the activities of invertase,urease,amylase,catalase were in the same order.The acid phosphatase activity was in the order of island forest wetland>Carex lasiocarpa wetland>Calamagrostis angustifolia wetland.However,the activity of cellulase was in the order of Carex lasiocarpa wetland>island forest wetland>Carex lasiocarpa wetland.Through Pearson correlative analysis,the activities of urease,amylase,catalase were significant related to soil nutrients.And there were significant correlation among the three enzymes.Therefore,the activities of urease,amylase and catalase were possible to predict the soil nutrients.