文章摘要
文利军, 史文娟, 庞琳娜.γ-聚谷氨酸对土壤水分入渗和水盐运移的影响[J].水土保持学报,2019,33(3):76~80,87
γ-聚谷氨酸对土壤水分入渗和水盐运移的影响
Effects of Poly-γ-glutamic Acid on Soil Water Infiltration and Water and Salt Transport
投稿时间:2018-12-28  
DOI:10.13870/j.cnki.stbcxb.2019.03.012
中文关键词: γ-聚谷氨酸  土壤水分  入渗  水盐运移
英文关键词: Poly-γ-glutamic acid  soil water  infiltration  soil water and salt transportation
基金项目:国家自然科学基金项目(51379173);陕西省自然科学基础研究计划项目(2018JM5051);陕西省教育厅重点实验室科研计划项目(16JS085)
作者单位E-mail
文利军, 史文娟, 庞琳娜 西安理工大学省部共建西北旱区生态水利国家重点实验室, 西安 710048 shiwj@xaut.edu.cn 
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中文摘要:
      γ-聚谷氨酸(Poly-γ-glutamicacid,γ-PGA)是一种优良的新型环保高分子材料,具有良好的吸水性、超强的吸附性和生物可降解性,节水潜力较大。通过室内土柱模拟试验,研究了不同γ-PGA施量(0,1%,3%,5%)对土壤水分入渗和水盐运移的影响。结果表明:随着γ-PGA施量的增加,土壤的入渗能力与湿润锋运移速度均减弱,稳定入渗率显著减小,与对照相比,添加1%,3%,5%γ-PGA的累积入渗量分别减小16.22%,40.34%,54.72%,湿润锋峰值分别减小了17.74%,52.32%,61.61%)随着γ-PGA施量的增加,Philip公式中的吸渗率(S)从1.669减小到0.854)Kostiakov公式中的经验系数(K)从0.855减小到0.792,经验指数(β)从0.356增加到0.480,且γ-PGA施量与SK之间呈线性负相关,其斜率分别为-16.583,-1.195)添加γ-PGA可改变土壤水盐的分布特征)随着γ-PGA施量的增加,表层土壤(0—10 cm土层)的含水率呈增加趋势,10 cm以下土壤的含水率呈减小趋势,但含盐量的土壤剖面变化趋势则与含水量呈相反的趋势,表明γ-PGA可减少土壤水分的下渗,显著增加土壤的滞水能力,然而聚谷氨酸对土壤盐分运移没有显著影响。该研究为γ-PGA作为节水控盐的土壤改良剂提供了理论依据。
英文摘要:
      Poly-gamma-glutamic acid (γ-PGA) is a new type of environmental friendly polymer material. It has good water absorption, super adsorption and biodegradability, and has great potential for water saving. In this paper, the effects of different γ-PGA application rates (0, 1%, 3%, 5%) on soil water infiltration and soil water and salt transport were studied through indoor soil column simulation experiments. The results showed that with the increase of γ-PGA application rates, both the infiltration capacity and the wetting front movement velocity of soil decreased, and the stable infiltration rate also decreased significantly. Compared with the control, the cumulative infiltrations with 1%, 3% and 5% γ-PGA applied decreased by 16.22%, 40.34% and 54.72% respectively. The advancing distances of wetting fronts decreased by 17.74%, 52.32% and 61.61% respectively. The simulation results of two kinds of infiltration model parameters showed that the absorption rate (S) in Philip formula decreased from 1.669 to 0.854 when the amount of γ-PGA was increased. The empirical coefficient (K) in the Kostiakov formula reduced from 0.855 to 0.792. The empirical index (β) increased from 0.356 to 0.480, and there was a linear negative correlation between the amount of γ-PGA application and the parameters of S and K. The slopes were -16.583 and -1.195 respectively. The application of γ-PGA changed the water and salt distribution in soil profile.With the increase of γ-PGA application, the water content of surface soil (0-10 cm soil layer) increased, while that of deep soil (below 10cm soil layer) decreased, but the change trend of the salinity in soil profile was opposite to that of soil water. This indicated that γ-PGA could reduce the infiltration of soil water and significantly increase the water holding capacity of soil. At the same time, γ-PGA could significantly improve the salt leaching in the soil surface. This study provides a theoretical basis for the use of γ-PGA in water saving and removal of soil salt as a soil amendment.
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