【摘要】：為探究秸稈排水體對(duì)鹽漬土水鹽運(yùn)移的影響及其排水排鹽效果,通過(guò)室內(nèi)土柱試驗(yàn),研究在淡水(CK)和微咸水灌水情況下秸稈排水體埋深為40和60 cm時(shí)供試土壤的水鹽分布狀況。結(jié)果表明,入滲階段,濕潤(rùn)鋒與入滲時(shí)間呈冪函數(shù)關(guān)系,累積入滲量與入滲時(shí)間則可采用Kostiakov模型進(jìn)行擬合;蒸發(fā)階段,秸稈排水體對(duì)埋設(shè)深度以下的土體具有明顯的保水作用,40 cm埋深的處理在40~70 cm土層范圍以及60 cm埋深的處理在50~70 cm土層范圍土壤水分變化的相對(duì)變化量均0;秸稈排水體有利于保持灌水后土壤的脫鹽狀態(tài),40 cm埋深處理和60 cm埋深處理比無(wú)埋設(shè)的對(duì)照處理分別減少了19.61%和15.68%的鹽分變化量;秸稈體的排水排鹽效果與灌水礦化度和秸稈排水體埋深密切相關(guān),灌溉水礦化度適當(dāng)?shù)脑黾雍徒斩掦w的埋設(shè)加深將有利于排水效果的提升,低灌溉水礦化度結(jié)合秸稈體深埋具有更好的排鹽效果。該研究為微咸水灌溉及鹽漬土的開(kāi)發(fā)利用提供依據(jù)和參考。
[Abstract]:In order to explore the effect of the straw drainage body on the water and salt migration of saline soil and the effect of drainage and salt drainage, the distribution of water and salt in the tested soil under the condition of fresh water (CK) and brackish water irrigation under the conditions of fresh water (CK) and brackish water irrigation was studied. The results showed that the wetting front and the infiltration time had a power function relationship with the infiltration time, and the accumulation was accumulated. The infiltration amount and infiltration time can be fitted with the Kostiakov model. In the evaporation stage, the straw drainage body has obvious water conservation effect on the soil below the buried depth, and the relative change of soil moisture change in the range of 40~70 cm soil layer and 60 cm buried depth in the 40~70 cm soil layer is 0, and the straw drainage body is found. It is beneficial to maintain the desalination state of soil after irrigation. The 40 cm buried depth treatment and 60 cm buried depth treatment reduce the salinity of 19.61% and 15.68%, respectively, and the effect of drainage and salt drainage of straw body is closely related to the salinity of water and the buried depth of the straw drainage body, the increase of the salinity of the irrigation water and the burial of the straw body. Deepening will be beneficial to the improvement of drainage effect. Low irrigation water salinity and deep burial of straw have better effect on salt drainage. This study provides a basis and reference for the development and utilization of saline water irrigation and saline soil.
【作者單位】： 南方地區(qū)高效灌排與農(nóng)業(yè)水土環(huán)境教育部重點(diǎn)實(shí)驗(yàn)室;河海大學(xué)水利水電學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51579069) 高等學(xué)校學(xué)科創(chuàng)新引智計(jì)劃項(xiàng)目(B12032) 中央高�；究蒲袠I(yè)務(wù)費(fèi)(2015B42314)
【分類(lèi)號(hào)】：S156.4
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本文編號(hào)：2134264