蓄水坑灌不同灌水量土壤水分分布特征分析

发布时间：2018-08-04 14:09

【摘要】：蓄水坑灌是一种新型的果林节水灌溉方法,为合理确定灌水量,进行了田间不同灌水量条件下土壤水分运动试验。试验以灌水量为控制因子,设300、200、100 L/棵3种灌水量水平,研究不同灌水量条件下的果树土壤水分垂向、径向变化特征。结果表明:在不同灌水量条件下,土壤含水率增量在垂向上的变化趋势一致,随着土壤深度的增加呈现先增大后减小的趋势,在同一深度范围,灌水量越大,土壤含水率增量也越大;不同灌水量条件下的土壤含水率增量在径向上的分布无明显差异,均呈现以蓄水坑为中心向两侧递减、土壤含水率增量在蓄水坑附近最大的特征;同深度的土壤含水率和土体湿润范围随时间的推移逐渐减小,最大土壤含水率也随时间推移而减小。
[Abstract]:Water storage pit irrigation is a new water-saving irrigation method for fruit forest. In order to determine the irrigation amount reasonably, soil water movement experiments were carried out under different irrigation amount in the field. Taking irrigation amount as control factor, three irrigation levels of 300200100 L / tree were set up to study the vertical and radial variation of soil moisture in fruit trees under different irrigation rates. The results showed that the variation trend of soil moisture content increment in vertical direction was the same under different irrigation conditions. With the increase of soil depth, the soil moisture content increased first and then decreased, and in the same depth range, the irrigation amount increased. The larger the increment of soil moisture content is, the more the distribution of soil moisture content increment in radial direction is no significant difference under different irrigation amount, all of them show the characteristics that the water storage pit is the center and the increase of soil moisture content is the largest near the storage pit. The soil moisture content and soil wetting range of the same depth gradually decreased with the passage of time, and the maximum soil moisture content also decreased with the passage of time.
【作者单位】：太原理工大学水利科学与工程学院;
【基金】：国家自然科学基金资助项目(51109154,51249002) 教育部博士点基金资助项目(20111402120006,20121402110009) 山西省青年科技研究基金资助项目(2012021026-2) 山西省科技攻关项目(20110311018-1,20140311016-6) 山西省高等学校创新人才支持计划资助项目
【分类号】：S275;S152.7

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