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(P<0.05).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.
Carbon dioxide emission from paddy soil could be changed by different straw recycles through soil enzyme activities. In this research we tried to determine the soil enzyme activities and soil respiration in different straw recycles including wheat and rape straw returning（W1, R1）, mulching（W2, R2） and control（CK）. The results showed two peaks of soil respiration in June and September respectively under all straw returning treatments. Straw returning increased soil respiration in all treatments except rape straw returning in mulch. We also found that soil urease and invertase had different responses to the pattern of straw returning. Soil urease enzyme activity had no obviously difference under different straw returning patterns, suggesting that nitrogen and enzyme activity related to nitrogen transformation was not sensitive to straw returning. However, invertase activity was sensitive to straw returning and there was a significant positive correlation between invertase and soil respiration. Therefore, invertase could reflex the changes of soil respiration and could be an indicator of the latter.
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2017年第1期28-32,共5页
Chinese Journal of Applied and Environmental Biology
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~~
关键词
土壤呼吸
脲酶
蔗糖酶
秸秆还田
翻埋
soil respiration
urease
invertase
straw returning
mulch
作者简介
E-mail：haijiangbo@126．com
