连续秸秆还田对水稻土中钾素形态的影响  

Effect of Continuous Straw Incorporation on Forms of Potassium in the Paddy Soils

作　　者：殷志遥 黄丽[1] 薛斌[1] 黄雅楠[1] 李小坤[1] 鲁剑巍[1] 

机构地区：[1]华中农业大学农业部长江中下游耕地保育重点实验室,湖北武汉430070

出　　处：《土壤通报》2017年第2期351-358,共8页Chinese Journal of Soil Science

基　　金：公益性行业专项基金(No.201503123)资助

摘　　要：湖北省武穴市、荆州市和武汉市三个水旱轮作长期定位试验的基础上,研究了连续秸秆还田(三地秸秆还田时间分别为9、5和3年)对不同层次(0~20 cm和20~40 cm)土壤中各形态钾素(水溶性钾、特殊吸附钾、非特殊吸附钾、非交换性钾、矿物钾、全钾)的影响。结果表明:秸秆还田能显著增加0~20 cm土层中特殊吸附钾和非特殊吸附钾的含量,两者的增量分别为9.92%~138.35%和35.57%~143.79%,其中武穴试验点的增加效果相对最好。20~40 cm土层,各处理之间变化规律不明显。土壤全钾含量表现为武穴试验点最低(2.59~3.15 g kg^(-1)),与荆州和武汉试验点差异性较大(9.45~11.91 g kg^(-1))。武穴和荆州试验点供钾能力较低(速效钾含量<100 mg kg^(-1)),武汉试验点供钾能力为中等(速效钾含量在100~150 mg kg^(-1))。矿物钾和全钾呈极显著正相关(武穴、荆州和武汉试验点的相关系数分别为0.994**、0.999**、1.000**),速效钾中各组分与速效钾的相关性在三个试验点存在差异,其中还田时间越长相关性越好。Based on the long-term experiments in Wuxue, Jingzhou and Wuhan of Hubei Province, the present study investigated the long-term effect of continuous straw returning （9, 5 and 3 years respectively） under different crop rotation system on various forms of potassium （K, including water soluble K, specifically absorptive K, non-specifically absorptive K, non-exchangeable K, mineral K, total K） in the different soil layers （0 - 20 cm and 20 - 40 cm）. Results showed that straw returning increased the contents of soil specifically absorptive K and non-specifically absorptive K with the increment of 9.92% - 138.35% and 35.57% - 143.79%, respectively, in 0 - 20 cm layer. This increase effect was relatively most in Wuxue. No significant differences among treatments were observed in the 20 - 40 cm soil layer. Soil total K concentration was the lowest （2.59 - 3.15 g kg^-1） in Wuxue, and its differences between Jingzhou and Wuhan （9.45 - 11.91 g kg-1） was significant. The supply capacity of soil K was low in Wuxue and Jingzhou （available K content 〈 100 mg kg^-1） and was middle in Wuhan （available K content of 100 - 150 mg kg^-1）. Correlation between mineral K and total K was extremely significant and the correlation coefficient was, respectively, 0.994＊＊, 0.999＊＊, 1.000＊＊ in soils of Wuxue, Jingzhou and Wuhan. There were differences in the correlation between available K and available K among the three experimental sites. And the longer the term of straw returning was, the better the correlation was.

关 键 词：秸秆还田 土壤钾素 有机质 PH 

分 类 号：S147.2[农业科学—肥料学]