本文選題：膜孔灌　切入點(diǎn)：多向交匯　出處：《中國(guó)農(nóng)村水利水電》2017年05期 　論文類型：期刊論文

【摘要】：通過(guò)室內(nèi)試驗(yàn),研究了相同供水條件下不同取土?xí)r間的土壤NO_3~--N在濕潤(rùn)體剖面的分布及運(yùn)移特性。結(jié)果表明:在供水入滲階段,土壤NO_3~--N濃度的最大值出現(xiàn)在土壤表層;土壤NO_3~--N濃度鋒運(yùn)移距離和最大值隨時(shí)間的延長(zhǎng)而增大。供水停止時(shí),隨著與膜孔中心距離的增加,土壤NO_3~--N含量逐漸減少;膜孔中心兩側(cè)的濕潤(rùn)面在土體表層12 cm范圍內(nèi)NO_3~--N含量變化梯度較小,濕潤(rùn)鋒處的土壤NO_3~--N含量變化梯度較大;先交匯中心界面的NO_3~--N含量比后交匯中心界面的NO_3~--N含量稍大;土壤垂向含水率在土壤表層10 cm范圍內(nèi)相差較小,且分布均勻;在10 cm以下變化梯度較大,各中心垂向土壤含水率的變化梯度為:abDCAB;垂向土壤NO_3~--N含量在表層8 cm范圍內(nèi)相差較小,且分布均勻;810 cm范圍內(nèi),后交匯中心ab的土壤NO_3~--N含量比AB和DC中心的稍小;10 cm以下的土壤NO_3~--N含量變化梯度為:abDCAB。進(jìn)入再分布階段,土壤NO_3~--N濃度鋒運(yùn)移距離隨時(shí)間繼續(xù)延長(zhǎng),濕潤(rùn)土體內(nèi)NO_3~--N濃度的分布逐漸均勻;隨時(shí)間的延長(zhǎng),土壤剖面NO_3~--N濃度的最大值逐漸減小,且位置逐漸向下遷移。說(shuō)明對(duì)于灌水定額較小的膜孔肥液多向交匯入滲,NO_3~--N主要存在于土壤表層,對(duì)地下水造成污染的可能性較小。
[Abstract]:Through laboratory tests, the effects of soil NO_3~--N in different time under the condition of the same soil water distribution and transport characteristics of wetted section. The results showed that: in the water infiltration, soil NO_3~--N concentration reached the maximum at the surface soil; soil NO_3~--N concentration front transport distance and the maximum value increased with the time to stop water supply. When, with increasing distance from film hole center, soil NO_3~--N content decreased gradually; the wetted surface on both sides of the film hole center on the soil surface in the range of 12 cm NO_3~--N content change gradient is small and the wetting front change gradient of soil NO_3~--N content greatly; NO_3~--N content and NO_3~--N content of the intersection of the center interface than the intersection center interface slightly large; vertical soil moisture content in the soil surface in the range of 10 cm is small, and uniform distribution; larger under 10 cm gradient, the vertical soil moisture The change rate of the gradient is abDCAB; vertical soil NO_3~--N content in the surface within the range of 8 cm is small, and uniform distribution; in the range of 810 cm, after the intersection of the center of AB soil NO_3~--N content than AB and DC center slightly smaller; variation gradient of soil NO_3~--N content below 10 cm: abDCAB. into the distribution stage, the soil NO_3~--N concentration front transport distance with time to extend the distribution of NO_3~--N concentration in the wet soil body gradually uniform; with the extension of time, the maximum value of soil NO_3~--N concentration decreased gradually, and the position gradually downwards. That film hole fertilizer solution for irrigation quota small bilateral interference infiltration, NO_3~--N mainly exists in the soil the surface, the smaller the possibility of groundwater pollution caused by.

【作者單位】： 蘭州交通大學(xué)土木工程學(xué)院;甘肅省電力設(shè)計(jì)院;西安理工大學(xué)水資源研究所;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(50579064,51479161) 蘭州交通大學(xué)“青藍(lán)”人才工程基金項(xiàng)目(QL-08-20A)
【分類號(hào)】：S153

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本文編號(hào)：1645446