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淋洗水质和水量对宁夏龟裂碱土水盐运移的影响 预览 被引量:5

Effects of the Quality and Quantity of Leaching Water on Soil Water and Salt Movement of Takyric Solonetzs in Ningxia
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摘要 为了探明龟裂碱土土壤剖面盐分分布与淋洗水质和水量的定量化关系,为宁夏引黄灌区龟裂碱土改良提供科学依据,通过室内土柱淋洗试验,开展了脱硫石膏施用下水质和水量对宁夏龟裂碱土水盐运移影响的研究。结果表明:脱硫石膏施用下龟裂碱土随着入渗时间的增加,累积入渗水量和湿润锋深度呈先急剧增加再缓慢增加的趋势,同一淋洗水量下入渗历时表现为黄河水〈沟水〈农田排水,淋洗水中的Na~+对龟裂碱土土壤入渗能力的影响较大;与土壤初始值相比,各处理0—20cm土层土壤pH值均有不同程度的降低,土壤脱盐率在79.53%~90.83%之间,阳离子溶脱率均表现为Mg~(2+)〉Na~+;利用农田排水淋洗龟裂碱土在降低0—40cm土层土壤全盐和主要盐分离子Na~+、Cl~-、Mg~(2+)、HCO_3~-含量方面效果较黄河水更为明显,淋洗水质对0—40cm土层Mg~(2+)和HCO_3~-溶脱率的影响表现为黄河水〈沟水〈农田排水。由于所用农田排水矿化度较低,农田排水淋洗处理土壤下层盐分聚积现象并没有比黄河水处理更明显。 In order to investigate the quantitative relationship of salt distribution in the soil profile of takyric solonetzs with the quality and quantity of leaching water, and provide scientific basis for the improvement of takyric solonetzs in the Yellow River irrigation district of Ningxia, soil column leaching experiments were carried out in laboratory and the effects of the quality and quantity of leaching water on soil water and salt movement of takyric solonetzs under the application of desulfurization gypsum were studied. The results indicated that under the application of desulfurization gypsum, the cumulative infiltration amount and the depth of wetting front of soil increased rapidly at first and then decreased slowly with increasing infiltration time for takyric solonetzs. With the same leaching water quantity, infiltration duration in different leaching water treatment listed in the following order: the Yellow River water〈ditch water〈farmland drainage water, and Na+ in the leaching water had a great effect on the infiltration capacity of takyric solonetzs. Compared with the initial value of soil, soil pH values in 0-20 cm soil layer of all treatments decreased in different degree, and soil desalinization ratios were among 79.53% to 90.83%. The desalinization ratio of cation showed Mg2+〉 Na+. Compared with the Yellow River water, farmland drainage water led to more obvious reductions in total salt content and the contents of major salt ions such as Na+ , C1- , Mg2+ and HCO3- in the 0-40 cm soil layer. The effect of different leaching water on the desalinization ratios of Mg2+ and HCO3- listed in the following order: the Yellow River water〈ditch water〈farmland drainage water. Since the salinity of farmland drainage water in this study was quite low, salt accumulation phenomenon of subsoil in farmland drainage water treatment was not more obvious than that in the Yellow River water treatment.
作者 樊丽琴 杨建国 尚红莺 张永宏 FAN Liqin;YANG Jianguo;SHANG Hongying;ZHANG Yonghong(Institute of Agricultural Resources and Environment,Ningxia Academy of Agriculture and Forestry Sciences; Yinchuan 750002)
出处 《水土保持学报》 CSCD 北大核心 2015年第6期258-262,共5页 Journal of Soil and Water Conservation
基金 宁夏自然科学基金项目(NZ13121) 国家科技支撑计划项目(2013BAC02B05) 宁夏农林科学院科技创新先导项目(NKYG-14-26)
关键词 龟裂碱土 土柱淋洗试验 脱硫石膏 淋洗水质和水量 水盐运移 takyric solonetzs soil column leaching experiments desulfurized gypsum quality and quantity of leaching water water and salt movement
作者简介 樊丽琴(1979-),女,河南漯河人,副研究员,硕士,主要从事土壤改良研究。E-mail:fanlqnx@126.com
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