旱作条件下盐分冲洗试验对盐碱土的改良洗盐效果

发布时间：2018-12-12 12:54

【摘要】：在旱作条件下设置排盐沟、施用脱硫石膏、深松耕等处理,开展农田快速淋盐试验。结果表明,灌水定额5 100 m~3/hm~2时,"排盐沟+脱硫石膏+深松耕"模式下,0~100 cm土层SO_4~(2-)、Cl~-、K~+含量显著下降,土壤pH值显著降低,0~60 cm土层土壤碱化度下降明显;同样灌水定额条件下,"排盐沟+深松耕"洗盐模式能显著降低0~40 cm土层CO_3~(2-)、Ca~(2+)、Mg~(2+)含量;施用脱硫石膏在降低0~40 cm土壤pH值起主导作用,深松对脱硫石膏降低土壤pH值效果有负作用。"灌水定额5 100 m~3/hm2+排盐沟+脱硫石膏+深松耕"模式下土壤pH值、碱化度显著降低,全盐淋洗效果最佳,为盐碱地改良以及进一步开发利用提供参考。
[Abstract]:The experiment of rapid salt leaching in farmland was carried out by setting up salt drainage ditch, applying desulphurization gypsum and deep soaking under dry condition. The results showed that the SO_4~ (2 -) and Cl~-,K~ content in 0 ~ 100 cm soil layer decreased significantly and the soil pH value decreased significantly under the model of "deep loosening ploughing gypsum in salt ditch desulfurization" with irrigation quota of 5 100mg / hm-2, and the content of Cl~-,K~ decreased significantly in the soil layer of 0 ~ (100) cm. The alkalinity of 0 ~ 60 cm soil layer decreased obviously; Under the same irrigation quota, the salt-washing model of "deep loosening in drain ditch" could significantly reduce the contents of CO_3~ (2-), Ca~ (2) and Mg~ (2) in 0 ~ 40 cm soil layer. The application of desulphurized gypsum played a leading role in reducing the pH value of 0 ~ 40 cm soil, and deep loosening had a negative effect on reducing the soil pH value of desulfurized gypsum. " Under the model of irrigation water quota of 5 100 m~3/hm2, the pH value of soil decreased significantly, and the effect of total salt leaching was the best, which provided a reference for the improvement of saline-alkali land and the further development and utilization of saline-alkali land.
【作者单位】：北方民族大学生物科学与工程学院;宁夏农林科学院农业资源与环境研究所;宁夏农产品质量标准与检测技术研究所;中电投宁夏青铜峡能源铝业集团有限公司青铜峡铝业分公司质检站;
【基金】：国家科技支撑计划(编号:2013BAC02B05) 国家自然科学基金(编号:31060180) 研究生创新项目(编号:YCX1648)
【分类号】：S156.4

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