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以亚热带红泥砂田为研究对象,在15℃和25℃条件下,利用淹水培养法模拟水田土壤紫云英翻压还田,研究其对土壤可溶性有机氮(SON)、酶活性及微生物量碳、氮的影响。结果表明:15℃和25℃条件下翻压紫云英后土壤SON含量总体呈先上升后下降并趋于平稳的变化规律,分别于培养15 d和10 d达到峰值,比未翻压紫云英处理提高138.11%和84.20%。两种温度条件下翻压紫云英均显著提高土壤SON含量、脲酶、蛋白酶和谷氨酰胺酶活性以及微生物量碳和氮。土壤SON含量与脲酶、蛋白酶、谷氨酰胺酶、微生物量碳和氮呈显著或极显著正相关。翻压紫云英后水田土壤SON的迁移及其环境风险应引起充分关注。
Taking the subtropical red muddy sand as the research object, under the conditions of 15 ℃ and 25 ℃, flooding culture was used to simulate the action of soil urease to turn over the soil and to study on its effects on soil dissolved organic nitrogen (SON), enzyme activity and microbial biomass Carbon, nitrogen effects. The results showed that SON content of soil was firstly increased, then decreased and then became steady, and reached its peak at 15 d and 10 d, respectively, The UK handled 138.11% and 84.20% higher. Transpiration of Chinese milk vetch under both temperature conditions significantly increased soil SON content, urease, protease and glutaminase activities as well as microbial biomass carbon and nitrogen. Soil SON content was significantly or very significantly positively correlated with urease, protease, glutaminase, microbial biomass carbon and nitrogen. After translating Ziyunying soil paddy soils SON migration and environmental risks should be fully concerned.