本文選題：土壤水吸力 + 吸濕曲線　； 參考：《新疆農(nóng)業(yè)大學(xué)學(xué)報(bào)》2017年02期

【摘要】：為探究滴灌棉田粉砂壤土土層深度對(duì)土壤水分特征曲線的影響,采用張力計(jì)法對(duì)0~20cm,20~40cm,40~60cm深度土層土壤水分特征曲線測(cè)定并分析,選用van Genuchten模型進(jìn)行擬合。結(jié)果表明,隨著土層深度的增加,土壤體積含水率隨土壤水吸力的變幅降低,變化最快的土層為0~20cm,20~40cm;在同一吸力下,土壤容重越大的土層,相應(yīng)含水率越大,各土層含水率大小表現(xiàn)為:0~20cm20~40cm40~60cm;不同土層吸濕曲線與脫濕曲線不相同,有滯后現(xiàn)象存在。試驗(yàn)區(qū)各土層吸濕與脫濕土壤水分特征曲線均與van Genuchten模型擬合較好,其中40~60cm土層擬合最優(yōu),擬合相關(guān)系數(shù)0.8600~0.9949,實(shí)測(cè)值與模擬值均方根誤差均小于0.01。
[Abstract]:In order to investigate the effect of soil depth on soil moisture characteristic curve in drip irrigation cotton field, the soil moisture characteristic curve of 0 ~ 20 cm ~ (20) ~ (20) ~ (40) ~ (40) cm ~ (-1) ~ (40) ~ (60) cm depth was measured and analyzed by using tensometer method, and the van Genuchten model was used to fit the curve. The results showed that with the increase of soil depth, the volume moisture content of soil decreased with the variation of soil water suction, the fastest change was 0 ~ 20 cm ~ (-1) ~ (20) cm ~ (20) ~ (20) ~ (40) cm, and under the same suction, the higher the bulk density of soil was, the greater the corresponding moisture content was. The moisture content of each soil layer is 20 cm ~ 20 cm ~ (20) ~ 40 cm ~ 40 ~ (60 cm), and the hygroscopic curve and dehumidification curve of different soil layers are different, and the phenomenon of lag exists. The characteristic curves of moisture absorption and dehumidification of each soil layer in the test area were fitted well with van Genuchten model, among which 40~60cm soil layer fitting was the best, the correlation coefficient was 0.8600 ~ 0.9949, and the root mean square error between the measured value and the simulated value was less than 0.01.
【作者單位】： 新疆農(nóng)業(yè)大學(xué)水利與土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51469033) 河海大學(xué)水文水資源與水利工程科學(xué)國家重點(diǎn)實(shí)驗(yàn)室開放研究基金(2016490511)
【分類號(hào)】：S152.7

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1 葛菁萍,霍云鵬,蔡柏巖;大棚土壤水吸力研究[J];廈門大學(xué)學(xué)報(bào)(自然科學(xué)版);1999年02期

2 孔凡哲,王曉贊;利用土壤水吸力計(jì)算潛水蒸發(fā)初探[J];水文;1997年03期

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本文編號(hào)：1862994