草木樨与脱硫石膏对内蒙古盐渍化土壤的改良培肥作用与效果

发布时间：2018-07-07 10:25

本文选题：草木樨 + 脱硫石膏　；参考：《干旱地区农业研究》2016年01期

【摘要】：在内蒙古河套地区硫酸钠盐渍化土壤布置田间试验,研究种植草木樨和施用脱硫石膏(30 t·hm~(-2))对盐渍化土壤的改良作用与效果。结果表明:春季灌溉洗盐大幅度降低土体土壤p H值、盐渍化程度,尤其是表层土壤,p H值和EC值分别降低1.54~2.07和7%~69%,主要盐分离子Na+和SO42-分别降低了80%和39%。施用脱硫石膏对灌溉洗盐没有显著的影响,但显著降低土壤有机质、有效磷、有效钾含量,分别降低了20%、15%和50%;施用脱硫石膏提高草木樨生物量34%,但植株磷含量降低了42%。种植草木樨大幅度降低土壤EC值和盐分离子含量,表层土壤主要盐分离子Na~+和SO_4~(2-)含量分别从670 mg·kg~(-1)和2 500 mg·kg~(-1)降低至3.38 mg·kg~(-1)和140.80 mg·kg~(-1),降低了200倍和16倍;土壤有机质和碱解氮含量分别提高了6%和40%,而有效磷、有效钾却降低了49%和26%,同时施用脱硫石膏,尽管对土壤p H值、EC值和盐分离子浓度没有太大的影响,但显著提高了土壤有机质和碱解氮含量,有效磷和有效钾含量也相对有所增加。说明草木樨具有很好改良培肥盐渍化土壤作用,与脱硫石膏也有一定的交互作用,可加快盐渍化土壤改良培肥,但需要增加磷钾肥的施用。
[Abstract]:The effects of planting sweet clover and applying desulphurized gypsum (30t hm ~ (-2) on salinized soil were studied in the field experiment of sodium sulfate salinization in Hetao area of Inner Mongolia. The results showed that the soil pH value and soil salinization degree, especially the soil pH value and EC value of surface soil, decreased by 1.54 ~ 2.07 and 70.69, respectively, and the main salt ions Na and so _ 42- decreased by 80% and 39%, respectively. The application of desulphurized gypsum had no significant effect on irrigation salt washing, but significantly decreased soil organic matter, available phosphorus and available potassium content by 20% and 50%, respectively. The application of desulphurized gypsum increased the biomass of sweet clover by 34%, but the phosphorus content of plant decreased by 42%. The EC value and salt ion content of soil were significantly decreased by planting sweet clover, and the main salt ions Na ~ (-) and so ~ (4 ~ (2-) in topsoil decreased from 670 mg kg ~ (-1) and 2 500 mg kg ~ (-1) to 3.38 mg kg ~ (-1) and 140.80 mg kg ~ (-1), respectively, which decreased by 200 times and 16 times, respectively. Soil organic matter and alkali-hydrolyzed nitrogen content increased by 6% and 40%, respectively, while available phosphorus and available potassium decreased by 49% and 26% respectively, and desulfurized gypsum was applied simultaneously, although there was no significant effect on soil pH value, EC value and salt ion concentration. However, the contents of organic matter and alkali-hydrolyzed nitrogen in soil were significantly increased, and the contents of available phosphorus and available potassium were also increased. The results showed that sweet clover had a good effect on improving salinized soil and had some interaction with desulphurized gypsum, which could accelerate the improvement of salinized soil, but it needed to increase the application of phosphate and potassium fertilizer.
【作者单位】：中国农业大学资源与环境学院;
【基金】：国家“十二五”科技支撑计划项目(2013BAC02B06)
【分类号】：S156.4

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