极端干旱事件后湿地落干土壤微生物和酶活性研究

发布时间：2018-12-16 19:54

【摘要】：以极端干旱事件后的白龟山库区湿地落干土壤为研究对象,通过野外采样和室内测试分析,研究土壤微生物数量、酶活性、土壤养分特征及空间差异性.结果表明:土壤细菌、真菌、放线菌数量分别为40.83×10~6~115.78×10~6,g~(-1)、1.62×10~6~27.14×10~6,g~(-1)、0.55×10~6~1.29×10~6,g~(-1),细菌数量较高,真菌和放线菌数量较低;砂质样地的土壤微生物数量普遍低于泥质样地;土壤过氧化氢酶、脲酶、磷酸酶活性在砂质样地亦较低;土壤微生物数量指标、酶活性指标与土壤有机质含量或土壤全氮含量均呈不显著的正相关(P0.05),可能由于土壤落干时间相对较短,土壤有机质的矿质化作用尚未进行到一定程度;全磷和全钾含量较高可能对土壤酶具有一定的抑制作用.白龟山库区湿地在极端干旱事件干扰后进行保护和管理需关注土壤性质的空间异质性以及干扰的持续时间等.
[Abstract]:The dry soil of the wetland in Baiguishan reservoir area after the extreme drought event was studied. Through field sampling and laboratory test and analysis, the amount of soil microorganism, enzyme activity, soil nutrient characteristics and spatial difference were studied. The results showed that the numbers of bacteria, fungi and actinomycetes in soil were 40.83 脳 105.78 脳 105.78 脳 105.78 脳 105g ~ (-1), 1.62 脳 10 ~ (6) 627.14 脳 10 ~ (6) g ~ (-1), 0.55 脳 10 ~ (6) C ~ (-1) and 1.29 脳 10 ~ (-6) g ~ (-1), respectively. The number of bacteria was higher, and the number of fungi and actinomycetes was lower. The quantity of soil microorganism in sandy land was lower than that in muddy land, and the activities of catalase, urease and phosphatase were also lower in sandy land. Soil microbial quantity index, enzyme activity index and soil organic matter content or soil total nitrogen content showed no significant positive correlation (P0.05), which may be due to the relatively short dry time of soil. The mineralization of soil organic matter has not been carried out to a certain extent. The high content of total phosphorus and potassium may inhibit the soil enzyme to some extent. The conservation and management of wetland in Baekushan reservoir area after extreme drought events should pay attention to the spatial heterogeneity of soil properties and the duration of disturbance.
【作者单位】：平顶山学院低山丘陵区生态修复重点实验室;四川农业大学生态林业研究所林业生态工程省级重点实验室;
【基金】：河南省科技攻关计划资助项目(142102310186) 河南省教育厅科学技术研究重点资助项目(13A180821)
【分类号】：S154

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