黄土丘陵区林地干化土壤降雨入渗及水分迁移规律

发布时间：2018-04-11 21:05

本文选题：降雨 + 入渗　；参考：《水土保持学报》2017年03期

【摘要】：基于近年来黄土丘陵区林地形成大规模土壤干层的事实,为了探索降雨在黄土丘陵区枣林地干化土壤中的入渗、迁移规律,明确干化土壤的修复能力,在陕北米脂试验站建立野外10m大型土柱模拟枣林地干化土壤,采用CS650—CR1000土壤水分自动监测系统对其进行连续定位观测。观测数据分析表明:(1)独立降雨的入渗、迁移深度主要取决于降雨量,大、中、小雨的水分影响深度分别达90~140,70~80,40cm,降雨量一定时还与降雨强度、初始土壤含水量等因素有关,降雨强度越大、初始土壤含水量越高,水分的入渗深度及迁移深度也越大。(2)间歇降雨中几次降雨交互对水分的入渗、迁移产生促进作用。相同雨量下,其入渗深度较独立降雨可提高100%~160%,迁移深度可提高91%~197%。(3)黄土丘陵区并非所有降雨都对土壤水分有影响。观测期内降雨次数与降雨量的有效率分别为36.4%和72.7%。(4)土壤垂向剖面在多次降雨的累积作用下具有层次性,本试验期间降雨影响范围内的土壤剖面主要可以分为3层,0—90cm为降雨入渗敏感层,90—160cm为降雨入渗迟缓层,160—240cm为雨水迁移层。研究结果对于促进黄土丘陵区林地干化土壤的治理与修复,加强土壤水分的科学管理与改善具有重要的理论和实践意义。
[Abstract]:Based on the fact that large scale soil dry layer was formed in the forest land of loess hilly region in recent years, in order to explore the infiltration and migration law of rainfall in the dry soil of jujube forest in loess hilly area, and to clarify the repair ability of dry soil.The dry soil of jujube forest was simulated by 10m large soil column in the experiment station of Mizhi in northern Shaanxi. The soil moisture was observed continuously by CS650-CR1000 automatic monitoring system.The observation data analysis shows that the migration depth of the independent rainfall is mainly determined by the rainfall. The water influence depth of the moderate and moderate rain is 90 ~ 140 ~ 140 ~ 70 ~ 80 ~ 40 cm respectively. The rainfall is also related to the rainfall intensity and initial soil water content and so on, in a certain time, it is also related to the rainfall intensity, the initial soil water content and so on.The higher the rainfall intensity, the higher the initial soil moisture content, and the greater the infiltration depth and migration depth of water.Under the same rainfall, the infiltration depth can be increased by 100 ~ 160, and the migration depth can be increased by 91 ~ 1 ~ (197. 3) not all rainfall has an effect on soil moisture in the loess hilly area.During the observation period, the rainfall frequency and the effective rate of rainfall were 36.4% and 72.7%, respectively.) the vertical profile of the soil was stratified by the accumulation of multiple rainfall.During this experiment, the soil profile in the range of rainfall influence can be divided into three layers: 0-90 cm, sensitive layer of rainfall, 90-160 cm, slow layer of rainfall, 160-240 cm, Rain Water layer of migration, which is mainly divided into three layers: the sensitive layer of rainfall infiltration is 90-160 cm and the layer of slow infiltration of rainfall is 160-240 cm.The results of the study have important theoretical and practical significance for promoting the treatment and restoration of dry soil and strengthening the scientific management and improvement of soil moisture in the loess hilly region.
【作者单位】：西北农林科技大学水利与建筑工程学院;中国科学院水利部水土保持研究所;内蒙古自治区阿拉善左旗农牧局;
【基金】：陕西省科技统筹项目“红枣优质高效生产关键技术集成与示范”(2014KTCG01-03);陕西省科技统筹项目“陕北风沙区设施枣树节水提质增效技术研究”(2016KTZDNY-01-05) 国家科技支撑计划项目“陕北水蚀区植被功能调控技术与示范”(2015BAC01B03)
【分类号】：S152.7

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