枯草芽孢杆菌对盐碱土水分运动和水稳性团聚体的影响

发布时间：2018-03-17 03:18

  本文选题：枯草芽孢杆菌　切入点：γ-聚谷氨酸　出处：《水土保持学报》2017年04期 　论文类型：期刊论文

【摘要】：为探明微生物在盐碱地改良方面的应用,通过在盐碱土中加入枯草芽孢杆菌,研究不同浓度微咸水(0,1,2,3,4g/L)条件下,盐碱土中的水分运动和土壤水稳性团聚体的变化规律。结果表明:(1)枯草芽孢杆菌可以显著减少土壤的入渗能力,同时可减缓水分的迁移能力,添加枯草芽孢杆菌的土壤与相对应的对照组相比,累积入渗量和湿润锋推进距离均显著减少,其中在微咸水浓度为2g/L时,土壤累积入渗量减少幅度最大,为40.97%,其他处理减少程度依次为3,0,1,4g/L,湿润锋的推进距离也有类似的结果。(2)利用Philip和Kostiakov入渗模型拟合试验数据,发现Philip公式中的吸渗率S均小于相相应对照组,Kostiakov公式中的经验系数K均小于相应对照组,而经验指数β均大于相应对照组。(3)枯草芽孢杆菌可以增加土壤的保水能力,在微咸水浓度为2g/L时,对土壤水吸力的影响较大。与对照组相比,van Genuchten公式中土壤滞留含水率θr、饱和含水率θs及与进气值相关系数α均有所增大,形状系数n逐渐减小。(4)含有枯草芽孢杆菌的土壤,在微咸水入渗后其土壤团粒结构均有较大的改善。
[Abstract]:In order to find out the application of microorganism in the improvement of saline-alkali soil, by adding Bacillus subtilis to saline-alkali soil, we studied the conditions of different concentrations of brackish water (01g / L) and 3g / L (3g / L). The changes of water movement and soil water stable aggregates in saline-alkali soils were studied. The results showed that Bacillus subtilis could significantly reduce the infiltration ability of the soil and slow down the water migration. Compared with the control group, the cumulative infiltration and the advance distance of wetting front decreased significantly in the soil with Bacillus subtilis, and the soil cumulative infiltration decreased the most when the concentration of brackish water was 2 g / L, and the soil infiltration decreased significantly when the concentration of brackish water was 2 g / L. For 40.97, the reduction degree of other treatments is 3 0 / 1 / L, and the propulsive distance of the wetting front has similar results. (2) using Philip and Kostiakov infiltration models to fit the test data, It was found that the osmotic rate S in the Philip formula was lower than that in the corresponding control group. The empirical coefficient K in the Philip formula was lower than that in the corresponding control group, and the empirical index 尾 was higher than that in the corresponding control group. 3) Bacillus subtilis could increase the water retention capacity of soil. When the concentration of brackish water was 2 g / L, the soil water suction was greatly affected. Compared with the control group, the residual water content 胃 r, saturated water content 胃 s and the correlation coefficient 伪 with the inlet air value increased in the van Genuchten formula. The shape coefficient n decreased gradually. 4) the soil containing Bacillus subtilis improved greatly after the infiltration of brackish water.
【作者单位】： 西安理工大学西北旱区生态水利工程国家重点实验室培育基地;中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家实验室;
【基金】：国家自然科学基金项目(51239009,41371239) 陕西省科技支撑项目(2013KJXX-38) 陕西省自然科学基金项目(2015JQ5161) 西安理工大学特色研究计划项目(2016TS013)
【分类号】：S156.4
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本文编号：1622927