本文選題：微潤灌溉 + 壓力水頭��； 參考：《干旱地區(qū)農(nóng)業(yè)研究》2017年04期

【摘要】：為探究微潤灌溉條件下水分在不同壓力水頭、不同容重土壤中的入滲情況,通過室內(nèi)土箱模擬試驗(yàn),分別設(shè)置h=2.0、1.5、1.0 m的壓力水頭,土壤容重γ分別為1.20、1.30、1.40 g·cm~(-3),測定累計(jì)入滲量、濕潤鋒及土壤含水率3個(gè)指標(biāo)。結(jié)果發(fā)現(xiàn),水分累計(jì)入滲量與壓力水頭為正相關(guān)關(guān)系,與土壤容重為負(fù)相關(guān)關(guān)系;微潤管在空氣和地埋出流情況下的流量與壓力水頭均為線性增函數(shù)關(guān)系,相同壓力下,微潤管的空氣出流量明顯大于地埋流量,微潤灌溉系統(tǒng)更適宜采用地下埋管方式;濕潤鋒是以微潤管為中心的近似圓形,水平運(yùn)移距離與垂直向下運(yùn)移距離均大于垂直向上運(yùn)移距離,重力對(duì)微潤灌條件下水分運(yùn)移有一定的作用,但該作用隨著土壤容重的增加逐漸減小;濕潤鋒運(yùn)移距離與時(shí)間的關(guān)系近似為冪函數(shù)關(guān)系,入滲指數(shù)約為0.5;土壤容重越大,水分在土壤中的入滲速率越小,土壤對(duì)水分的蓄持能力越弱;經(jīng)計(jì)算,微潤灌溉的灌水均勻性符合要求。
[Abstract]:In order to investigate the infiltration of water in different pressure head and different bulk density soil under micro-moisturizing irrigation condition, through the laboratory soil tank simulation test, the pressure head of 1.51.0 m was set up, the soil bulk density 緯 was 1.20 ~ 1.301.40 g / cm ~ (-1) ~ (-1) ~ (-1) C ~ (-1), and the accumulative infiltration amount was determined. Moisture front and soil moisture content. The results showed that the cumulative infiltration of water was positively correlated with the pressure head, and negatively correlated with the soil bulk density, and the flow rate and pressure head of the micro-embellished pipe under the condition of air and buried discharge were all linear increasing function, and under the same pressure, the relationship between the flow rate and the pressure head was linear. The air discharge rate of the micro-wetting pipe is obviously larger than that of the buried pipe, so the micro-wetting irrigation system is more suitable for the underground buried pipe, and the wetting front is an approximate circle centered on the micro-embellish pipe. The horizontal migration distance and vertical downward migration distance are both larger than vertical upward migration distance. Gravity has a certain effect on water migration under the condition of micro-irrigation, but this effect decreases gradually with the increase of soil bulk density. The relation between moisture front migration distance and time is approximately a power function, and the infiltration index is about 0.5. The larger the bulk density of soil is, the smaller the infiltration rate of water in soil is, and the weaker the holding capacity of soil is. The irrigation uniformity of micro-moisturizing irrigation meets the requirements.
【作者單位】： 太原理工大學(xué)水利科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(31271645) 山西省農(nóng)業(yè)科技攻關(guān)項(xiàng)目(20140311007-4)
【分類號(hào)】：S152.7;S275
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本文編號(hào)：1992048