连续秸秆还田对水稻土中钾素形态的影响

发布时间：2018-03-01 22:15

本文关键词： 秸秆还田土壤钾素有机质 pH　出处：《土壤通报》2017年02期 　论文类型：期刊论文

【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。
[Abstract]:On the basis of the long-term positioning tests of three rotation crops in Wuhan, Hubei Province, Jingzhou City and Wuhan City, In this paper, we studied the effects of continuous straw returning (the time of returning straw to soil were 9 ~ 5 cm and 3 years) to different layers (20 ~ 20 cm and 20 ~ 40 cm) of potassium (water-soluble potassium, special adsorbed potassium, non-special adsorbed potassium, non-exchangeable potassium, mineral potassium). The results showed that the content of special adsorption potassium and non-special adsorbed potassium in 0 ~ 20 cm soil layer could be significantly increased by straw returning, and the increment of them were 9.92% 138.35% and 35.5757 ~ 143.79%, respectively. The increase effect of Wuxiao test site was the best in the soil layer of .2040 cm. The soil total potassium content was the lowest 2.59 ~ 3.15 g kg / kg ~ (-1) in Wu-Cave test site, which was different from Jingzhou and Wuhan test sites in 9.45 ~ 11.91 g 路kg ~ (-1) ~ (-1) 路kg ~ (-1) 路kg ~ (-1) 路L ~ (-1). The potassium supply capacity of Wuxian and Jingzhou test sites was relatively low (available potassium content was 100). The potassium supply capacity of Wuhan experimental site was moderate (available potassium content was 100 ~ 150 mg / kg). There was a very significant positive correlation between mineral potassium and total potassium. The correlation coefficients of Jingzhou and Wuhan test sites were 0.994 and 0.999, respectively. The correlation between the components of available potassium and available potassium was different in the three experimental sites, and the longer the returning time was, the better the correlation was.
【作者单位】：华中农业大学农业部长江中下游耕地保育重点实验室;
【基金】：公益性行业专项基金(No.201503123)资助
【分类号】：S141.4

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