稻田土壤呼吸及酶活性对不同秸秆还田方式的响应

发布时间：2018-05-13 08:26

本文选题：土壤呼吸 + 脲酶　；参考：《应用与环境生物学报》2017年01期

【摘要】：为了解秸秆还田通过改变土壤酶活性影响稻田土壤二氧化碳排放的过程,通过大田试验分析小麦和油菜秸秆翻埋还田(W1,R1)、覆盖还田(W2,R2)以及不还田(CK)处理下土壤呼吸和酶活性的变化及其对不同秸秆还田方式的响应.结果表明:(1)不同秸秆还田方式下土壤呼吸均表现为双峰值,峰值分别出现在6月(208.3±6.1 mL/kg)和9月(106.2±13.5 mL/kg).除油菜秸秆翻埋还田外,其他秸秆还田方式均增加了土壤呼吸作用.(2)土壤脲酶和蔗糖酶对不同秸秆还田方式响应各异.不同秸秆还田方式下土壤脲酶活性变化较小,没有表现出显著差异性.由此表明,不同秸秆还田对氮相关酶活性及氮素转化影响较小.而蔗糖酶在不同秸秆还田方式下差异较大.(3)蔗糖酶与土壤呼吸存在显著正相关关系(P0.05).上述结果表明蔗糖酶对秸秆还田较为敏感,可较好地表征秸秆还田过程中土壤呼吸变化状况,可为稻田营养循环利用提供有效依据.
[Abstract]:In order to understand the effect of straw returning on soil carbon dioxide emissions through changing soil enzyme activity, The changes of soil respiration and enzyme activity under the treatments of wheat and rape straw were analyzed under the treatments of wheat and rape straw mulching and non-returning CK) and their responses to different straw returning methods were analyzed. The results showed that soil respiration showed double peak values in June (208.3 卤6.1 mL / kg) and September (106.2 卤13.5 mL / kg), respectively. With the exception of rape straw burying, the other straw returning methods all increased soil respiration. 2) soil urease and sucrase had different responses to different straw returning methods. There was no significant difference in soil urease activity under different straw returning methods. The results showed that different straw returning had little effect on the activity of nitrogen-related enzymes and nitrogen transformation. There was a significant positive correlation between sucrase and soil respiration. The results indicated that sucrase was more sensitive to straw returning to the field and could better characterize the soil respiration during the process of straw returning and could provide an effective basis for the nutrient recycling of rice field.
【作者单位】：西北农林科技大学农学院;西南科技大学生命科学与工程学院;中国科学院山地生态恢复与生物资源利用重点实验室生态恢复与生物多样性保育四川省重点实验室中国科学院成都生物研究所;固体废物处理与资源化教育部重点实验室;核废物与环境安全国防重点学科实验室;
【基金】：国家自然科学基金项目(31601269) 中国科学院成都生物研究所重点实验室开放基金(KXYS201501) 中国博士后科学基金(2016M600751)资助~~
【分类号】：S154;S141.4

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