辽西北半干旱区垄膜沟种处理对土壤钾吸附/解吸特性的影响  

Effect of ridge with film mulching and furrowed seeding systems on soil K sorption-desorption characteristics in semiarid region of northwest Liaoning province

作　　者：冯晨[1] 孙占祥[1] 冯良山[1] 王鹏飞[1] 于秀捷 郑家明[1] 

机构地区：[1]辽宁省农业科学院耕作栽培研究所,辽宁沈阳110161 [2]辽宁省气象信息中心,辽宁沈阳110016

出　　处：《中国土壤与肥料》2016年第2期45-49,共5页Soil and Fertilizer Sciences in China

基　　金：国家科技支撑计划项目(2012BAD09B02);辽宁省科技攻关项目(2014213004);农业部公益性行业科研专项资金项目(201203031-07-02);辽宁"百千万人才工程"培养经费资助项目(2013921058)

摘　　要：为探明不同垄膜沟种处理（垄覆膜沟不覆盖T1和垄覆膜沟覆膜T2）对土壤钾吸附/解吸特性的影响,以农业部阜新农业环境与耕地保育科学观测实验站为平台,通过定位7年的田间试验（2007~2013年）,以传统种植（T0）为对照,结合实验室内批量平衡法,对长期垄膜沟种条件下根际土壤对重要养分钾的吸附/解吸能力进行研究和分析。结果表明：垄膜沟种处理有助于降低土壤对钾素养分的吸附,通过拟合Langmuir方程和Freundlich方程所求得的最大缓冲容量（MBC）和Kf值等相关参数可知,垄覆膜沟不覆盖种植处理下土壤对钾的吸附容量和吸附强度最小,最有利于削弱土壤对钾的吸附作用,减少钾的固定,各处理MBC值表现为T1（6.62）T1（47.48）〉T0（42.51）,平均滞后系数表现为T0（0.57）〉T1（0.53）〉T2（0.51）。其中垄覆膜沟覆膜处理的解吸率和滞后系数总体表现为最大和最小,说明该处理土壤所吸附的钾最容易被释放。To clarify soil K adsorption-desorption characteristics in different treatments of ridge with film mulching and furrowed seeding system in semiarid area in Liaoning, a field study was conducted from 2007 to 2013 at Fuxin Science Observation Re- search Stations of Agricultural Environment and Cultivated Land Conservation, including the treatments of ridge with film mulc- hing and furrow seeding （furrow was uncovered, T1 ）, both ridge and furrow with film mulching （ T2）, and the traditional planting （T0）. Laboratory experiment was combined to analyze the effects of ridge with film mulching and furrowed seeding system on soil K adsorption-desorption. The results indicated that T1 and T2 restrained the soil K adsorption according to the Langmuir and Freundlich equation parameters such as MBC and Kf, compared with that of TO. The buffer capacity and intensi- ty of K sorption in T1 treatment was the minimum among all the treatments. And the MBC value were ： T1 （6. 62） 〈 T2 （8. 53） 〈 T0 （16. 31 ）. The ridge with film mulching and furrowed seeding system also had a stronger ability of desorption than conventional planting, the desorption ability of different treatments was T2 （49. 34） 〉 T1 （47.48） 〉 T0 （42. 51 ）, hysteresis coefficient was T0 （0. 57） 〉T1 （0. 53） 〉T2 （0. 51）. Soil K in T2 was most easily to be released.

关 键 词：垄膜沟种 钾 吸附特征 解吸特征 

分 类 号：S153[农业科学—土壤学]