摘要
研究了越冬期还田稻秸的腐解规律、养分释放规律及其对麦田土壤养分含量的影响。结果表明:越冬期还田水稻秸秆的腐解呈现出由慢到快又变慢的变化趋势,且与气温及降雨的变化相关;水稻秸秆中元素释放率表现为K>P>N,其中钾素主要在还田前期释放,且在小麦种植季结束时其释放率高达99%,而磷素与氮素主要在中后期释放,释放率在70%左右;秸秆还田会消耗土壤中的部分氮素,造成初期及后期土壤中碱解氮含量低于不还田处理的;秸秆还田具有培肥地力的作用,其可以提高土壤的有机质和钾素含量,同时可以调节土壤的pH值。
The decomposition law and nutrient release rule of rice straw which was returned to field at overwintering stage,as well as the effect of returning rice straw to filed on the soil nutrient content of wheat field were studied.The results showed that:the decomposition of rice straw returned to field at overwintering stage exhibited the change trend of slow-fast-slow,and it was related to air temperature and rainfall;the release rate of nutrient elements in rice straw had the following order:potassium(K)>phosphorus(P)>nitrogen(N);the K in rice straw was released mainly at the earlier stage of wheat growth and development,and its release rate at wheat harvest stage reached 99%;while the P and N in rice straw were released mainly at the middle and later stage of wheat growth and development,and their final release rate was about 70%;the treatment of returning rice straw to field could consume some nitrogen in soil,resulting in lower soil alkali-hydrolysable nitrogen content at the earlier and later stage of wheat growth and development than that in the treatment of not returning rice straw to filed;returning rice straw to field could improve soil fertility,soil organic matter and K content,and also could regulate soil pH-value.
作者
王静静
张鹏
毛筱晔
王素霞
李东升
杜洪艳
WANG Jing-jing;ZHANG Peng;MAO Xiao-ye;WANG Su-xia;LI Dong-sheng;DU Hong-yan(Lianyungang Land Reclamation and Agricultural Science Research Institute of Jiangsu Province,Lianyungang 222248,China)
出处
《江西农业学报》
CAS
2019年第2期42-45,共4页
Acta Agriculturae Jiangxi
基金
江苏农垦农业科技项目"秸秆全量机械还田麦稻高产栽培技术的研究"(2015-05)
关键词
小麦
稻秸还田
越冬期
腐解
土壤地力
Wheat
Returning rice straw to field
Overwintering stage
Straw decomposition
Soil fertility
