不同还田方式下香蕉茎秆的腐解及养分释放特征  

Characteristics of Decomposing and Nutrients Releasing of Banana Stalk under Different Ways Returned to Field

作　　者：邹雨坤[1] 李光义[2] 李勤奋[1] 李赟婷[1] 田路园 张红燕[1] 侯宪文[1] 

机构地区：[1]中国热带农业科学院环境与植物保护研究所,海南海口571101 [2]农业部儋州农业环境科学观测实验站,海南儋州571737

出　　处：《天津农业科学》2014年第10期60-64,共5页Tianjin Agricultural Sciences

基　　金：公益性行业(农业)科研专项(201203072-04);国家科技支撑计划子课题(2012BAC18B04);现代农业产业技术体系项目(nycytx-17)

摘　　要：应用网袋法研究不同还田方式下香蕉茎秆的腐解及养分释放特征。结果表明：不同还田方式下,香蕉茎秆在0-30 d腐解速度快,30 d时,覆土、覆土覆膜和仅覆膜处理下质量累积减少率分别为60.6%,71.9%,77.6%;在180 d时,香蕉茎秆的质量累积减少率分别为86.4%,95.6%,91.0%,表现为覆土覆膜〉覆膜〉覆土。腐解过程中,覆土覆膜和仅覆膜处理下香蕉茎秆养分的释放速率表现为K〉P〉N≈C。180d时,碳、氮、磷、钾的累积释放率均达到80%以上。考虑香蕉茎秆还田养分的释放情况,可以适量减少基肥中钾肥用量,如果采用短期还田,建议使用仅覆膜的方式,如果长期还田建议使用覆土覆膜的方式。Net bags were employed to research characteristics of decomposing and nutrients releasing of banana stalk under different ways returned to field. The results showed that banana stalk had fast decomposing speed during 0 to 30 days under different ways returned to field. Under covered with soil, covered with soil and plastic film and covered with plastic film only, the accumulated decay rate was 60.6%,71.9%,77.6% respectively at the 30 th day, the accumulated decay rate was 86.4%,95.6%,91.0% respectively at the 180 th day, and was ranked as： covered with soil and plastic film〉 covered with soil 〉covered with plastic film only. Releasing speed of nutrients of banana stalk ranked as： potassium 〉phosphorus 〉nitrogen≈carbon under covered with soil and plastic film and covered with plastic film only. The accumulated releasing rate of carbon, nitrogen, phosphorus and potassium was above 80%. The content of potassic fertilizer in base manure consideration of nutrients releasing could be reduced. And it is suggested that using the way of covered with plastic film only in a short term and the way of covered with soil and plastic film in a long term when banana stalk to field were returned.

关 键 词：香蕉茎秆 还田方式 腐解特征 养分释放特征 

分 类 号：S668.1[农业科学—果树学]