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以鄱阳湖湿地灰化薹草(Carex cinerascens)洲滩表层土壤为研究材料,采用室内水分控制实验方法,设置不做任何处理的自然裸露、含水量保持在30%、放置在水面下10 cm和100 cm处4种不同水分梯度处理,土样经过42 d处理后,研究土壤微生物的生物量和土壤酶活性特征。研究结果表明,放置在水面下的土样的含水量、p H和总有机质含量都显著高于其它处理;含水量保持在30%的土样的微生物的生物量碳、氮含量分别最高,自然裸露处理下的最低;放置在水面下的土样的基础呼吸强度、乙酰氨基葡萄糖苷酶活性、磷酸酶活性、β-木糖苷酶活性、酚氧化酶活性和过氧化物酶活性都显著大于其它处理,且淹水深度对微生物的生物活性无显著影响。相关分析结果显示,影响灰化薹草洲滩表层土壤性质及其微生物和酶特性的主要因素是土壤含水量和有机质含量。
The surface soils of Carex cinerascens beach in Poyang Lake wetland were used as experimental materials. The indoor water control experiment was used to set the natural exposed without any treatment. The water content was kept at 30% 100 cm, four kinds of different water gradient treatments. Soil samples were treated for 42 days to study the characteristics of soil microbial biomass and soil enzyme activities. The results showed that the water content, p H and total organic matter content of soil samples placed under water were significantly higher than those of other treatments. The microbial biomass carbon and nitrogen content of soil samples with water content of 30% The lowest under bare treatment; the soil respiration intensity, acetaminoglucosidase activity, phosphatase activity, β-xylosidase activity, phenoloxidase activity and peroxidase activity of soil samples placed under water were significantly greater than other Treatment, and the depth of flooding had no significant effect on the biological activity of microorganisms. Correlation analysis showed that the main factors influencing soil properties and microbial and enzyme characteristics of soil erosion were soil moisture content and organic matter content.