本文選題：降雨 + 入滲��； 參考：《水土保持學(xué)報》2017年03期

【摘要】：基于近年來黃土丘陵區(qū)林地形成大規(guī)模土壤干層的事實,為了探索降雨在黃土丘陵區(qū)棗林地干化土壤中的入滲、遷移規(guī)律,明確干化土壤的修復(fù)能力,在陜北米脂試驗站建立野外10m大型土柱模擬棗林地干化土壤,采用CS650—CR1000土壤水分自動監(jiān)測系統(tǒng)對其進行連續(xù)定位觀測。觀測數(shù)據(jù)分析表明:(1)獨立降雨的入滲、遷移深度主要取決于降雨量,大、中、小雨的水分影響深度分別達90~140,70~80,40cm,降雨量一定時還與降雨強度、初始土壤含水量等因素有關(guān),降雨強度越大、初始土壤含水量越高,水分的入滲深度及遷移深度也越大。(2)間歇降雨中幾次降雨交互對水分的入滲、遷移產(chǎn)生促進作用。相同雨量下,其入滲深度較獨立降雨可提高100%~160%,遷移深度可提高91%~197%。(3)黃土丘陵區(qū)并非所有降雨都對土壤水分有影響。觀測期內(nèi)降雨次數(shù)與降雨量的有效率分別為36.4%和72.7%。(4)土壤垂向剖面在多次降雨的累積作用下具有層次性,本試驗期間降雨影響范圍內(nèi)的土壤剖面主要可以分為3層,0—90cm為降雨入滲敏感層,90—160cm為降雨入滲遲緩層,160—240cm為雨水遷移層。研究結(jié)果對于促進黃土丘陵區(qū)林地干化土壤的治理與修復(fù),加強土壤水分的科學(xué)管理與改善具有重要的理論和實踐意義。
[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.
【作者單位】： 西北農(nóng)林科技大學(xué)水利與建筑工程學(xué)院;中國科學(xué)院水利部水土保持研究所;內(nèi)蒙古自治區(qū)阿拉善左旗農(nóng)牧局;
【基金】：陜西省科技統(tǒng)籌項目“紅棗優(yōu)質(zhì)高效生產(chǎn)關(guān)鍵技術(shù)集成與示范”(2014KTCG01-03);陜西省科技統(tǒng)籌項目“陜北風(fēng)沙區(qū)設(shè)施棗樹節(jié)水提質(zhì)增效技術(shù)研究”(2016KTZDNY-01-05) 國家科技支撐計劃項目“陜北水蝕區(qū)植被功能調(diào)控技術(shù)與示范”(2015BAC01B03)
【分類號】：S152.7

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