【摘要】：為分析紅壤地區(qū)土壤容重對水分入滲的影響并將其應(yīng)用于指導(dǎo)灌溉生產(chǎn),以江西紅壤土為研究對象,采用垂直一維入滲方式模擬土壤容重對紅壤中水分垂直運動規(guī)律影響.結(jié)果表明:在同一時刻濕潤鋒、累積入滲量、入滲率均隨土壤容重的增大而減小,時間對濕潤鋒運移及累積入滲量影響程度相比于土壤容重較高,濕潤鋒與累積入滲量呈線性關(guān)系;入滲初期土壤容重對入滲率影響程度較高,隨著入滲的進(jìn)行其影響程度逐漸減小;飽和導(dǎo)水率與土壤容重呈負(fù)冪函數(shù)關(guān)系,Green-Ampt模型與Philip模型中飽和導(dǎo)水率模擬值在土壤容重大于1.30 g/cm3時相對誤差小于9.62%,計算精度較高;再分布過程中,土壤容重越大,同一土層高度上土壤含水量越小,0~50 cm土層中土壤含水量隨再分布時間增大而明顯減小,土壤容重對含水量影響具有統(tǒng)計學(xué)意義(P0.05),50~70 cm土層中土壤容重對其變化影響不具有統(tǒng)計學(xué)意義.該研究成果可為紅壤地區(qū)農(nóng)作物的灌溉提供理論支撐.
[Abstract]:In order to analyze the effect of soil bulk density on water infiltration in red soil area and apply it to guide irrigation production, the vertical one-dimensional infiltration method was used to simulate the effect of soil bulk density on the vertical movement of water in red soil. The results showed that the cumulative infiltration and infiltration rate decreased with the increase of soil bulk density at the same time, and the influence of time on the migration and cumulative infiltration was higher than that on soil bulk density. The effect of soil bulk density on infiltration rate was higher at the beginning of infiltration, and gradually decreased with infiltration. There is a negative power function relationship between saturated water conductivity and soil bulk density. In Green-Ampt model and Philip model, the relative error of saturated water conductivity is less than 9.62 when the soil bulk density is greater than 1.30 g/cm3, and the accuracy of calculation is higher. The smaller the soil moisture content in the same soil layer height is, the smaller the soil moisture content in the soil layer of 50 cm decreases with the increase of the redistribution time. The effect of soil bulk density on water content was statistically significant (P0.05) soil bulk density in 50 ~ 70 cm soil layer had no statistical significance. The research results can provide theoretical support for crop irrigation in red soil area.
【作者單位】： 西安理工大學(xué)水資源研究所;南昌工程學(xué)院江西省水工程安全與資源高效利用工程研究中心;
【基金】：國家重點研發(fā)計劃項目(2016YFC0400204) 國家自然科學(xué)基金資助項目(51279157,51479161) 國家農(nóng)業(yè)公益項目(201203003-1)
【分類號】：S152

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