本文選題：水氮量組合　切入點(diǎn)：凍融階段　出處：《節(jié)水灌溉》2017年03期 　論文類型：期刊論文

【摘要】：以季節(jié)性凍融期系列田間試驗(yàn)資料為基礎(chǔ),探求不同水肥耦合下非飽和凍融土壤介質(zhì)中含水率的時(shí)空變化特征。結(jié)果表明:封凍前N_0W_0含水率較灌水地塊低�？焖賰鼋Y(jié)階段水分運(yùn)移主要受凍結(jié)作用形成的附加基質(zhì)勢(shì)驅(qū)動(dòng),土壤聚墑區(qū)為20~50 cm,N_(500)W_(750)和N_(300)W_(375)處理峰值聚墑量高于其他處理。穩(wěn)定凍結(jié)期土壤聚墑區(qū)范圍延伸至60 cm處,含水率峰值下移至50 cm,由大到小為:N_(300)W_(750)、N_(300)W_(375)、N_(500)W_(750)、N_0W_0、N_(500)W_(375)、N_(100)W_(750)、N_(100)W_(375)。解凍后N_(300)和N_(500)地塊0~60 cm土層略高于自然儲(chǔ)水量;封凍前后表土層(0~20 cm)灌溉效應(yīng)衰減隨深度增加而延遲。N_(500)W_(750)和N_(300)W_(375)地塊10~20 cm凍結(jié)含水峰值呈現(xiàn)時(shí)間比N_0W_0提前7 d。灌水后30~40 cm含水率峰值高于N_0W_0,凍結(jié)聚墑峰值出現(xiàn)時(shí)間隨肥量的增加而縮短,消融期N_(500)W_(750)和N_(300)W_(375)處理對(duì)水分的吸持作用更強(qiáng)。N_(300)W_(750)和N_(300)W_(375)處理50~60 cm的含水率峰值較高,消融期增幅最為明顯,分別為2.00%和0.9%。凍融期各處理土壤含水率與N_0W_0絕對(duì)關(guān)聯(lián)度整體隨深度增加而減小,說明水氮量組合對(duì)凍融期0~60 cm含水率時(shí)程動(dòng)態(tài)的影響隨深度增加而遞減。
[Abstract]:Based on the data of seasonal freezing and thawing season field experiments, The temporal and spatial variation characteristics of moisture content in unsaturated frozen and thawed soil media under different coupling of water and fertilizer were studied. The results showed that the moisture content of N0W _ 0 was lower than that of irrigated land before freezing, and the water migration in rapid freezing stage was mainly driven by the additional matrix potential formed by freezing action. The soil moisture accumulation in the soil moisture accumulation area was 20 ~ (50 cm) and the peak value of soil moisture accumulation was higher than that in other treatments. The range of soil moisture accumulation was extended to 60 cm during the stable freezing period, and the peak value of soil moisture accumulation was increased to 60 cm during the freezing period, and the peak value of soil moisture accumulation was higher than that of other treatments. The peak of water content moved down to 50 cm, and the maximum water content was moved down to 50 cm, and from 1: Ns to 300 S / W / S / W / S / C / C / C / C / C / C / C / C / C / C / C / C / N / C / C / C / N / C / C / C / C / C / C / N / S / C / N / S / C / N / S / C / C / C / N / S / C / N / S / C / N / S / C / N / S / T / N / S / C / C / N / S / S / C / N / S / C / N / S / C / C / N / S / S / N / S / C / N / S / S / C / N / S / C. Before and after freezing, the attenuation of irrigation effect was delayed with the increase of depth, and the attenuation of irrigation effect was delayed with the increase of depth. The peak time of 1020 cm freezing water content in the 1020 cm structure of the stack was 7 days earlier than that of N0W0. The peak water content of 3040 cm after irrigation was higher than that of N0W0, and the time of the peak value of freezing accumulated moisture appeared with the time of the peak value of freezing water accumulation. The amount of fertilizer increased and shortened, The water absorption effect of the treatment is stronger. The absolute correlation degree between soil moisture content and NSCW _ 0 in freezing and thawing period decreased with the increase of depth, which indicated that the effect of combination of water and nitrogen on the time history of water content in 0 ~ 60 cm during freezing and thawing period decreased with the increase of depth.
【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(guó)家自然科學(xué)基金資助項(xiàng)目(41572239) 教育部博士點(diǎn)基金資助項(xiàng)目(20131402110008) 山西省自然科學(xué)基金資助項(xiàng)目(2015021169)
【分類號(hào)】：S152.7

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