本文選題：季節(jié)性凍融期 + 地表覆蓋��； 參考：《節(jié)水灌溉》2017年08期

【摘要】：為了揭示季節(jié)性凍融期地表覆蓋對土壤溫度時空變化的影響,分別設置了裸地(LD)、秸稈覆蓋(JG)和地膜覆蓋(DM)3種處理,運用數(shù)理統(tǒng)計學法和灰色關聯(lián)度法對凍融過程不同深度的土壤溫度隨時間的變化進行了統(tǒng)計分析。結果表明:地膜覆蓋對土層具有顯著的增溫效應;秸稈覆蓋對土壤溫度的影響在不同的凍融階段有所差異:凍結階段,秸稈覆蓋減少了土壤熱量的散失,對土層具有增溫作用;融化階段,秸稈覆蓋減弱了地氣間的熱交換,抑制了土層溫度的增加。地膜和秸稈覆蓋可以平抑土壤剖面地溫的變幅。在整個凍融期,兩種覆蓋處理均對地溫產生影響,0~20 cm對地溫的影響較大,20~90 cm地溫隨土壤深度的加深,土壤溫度的波動幅度逐漸減小。研究成果對于季節(jié)性凍土區(qū)地表覆蓋措施的選取提供依據(jù)。
[Abstract]:In order to reveal the effect of surface mulching on soil temperature in seasonal freezing and thawing period, three treatments were set up, I. e., LDD, JG and DMN, respectively. The variation of soil temperature with time in different depths of freeze-thaw process was analyzed by mathematical statistics and grey correlation method. The results showed that mulching with mulch had significant warming effect on soil layer, and the effect of straw mulching on soil temperature was different in different freezing and thawing stages: in freezing stage, straw mulching reduced the loss of soil heat and increased soil temperature. In the melting stage, straw mulch weakens the heat exchange between soil and atmosphere and inhibits the increase of soil temperature. Film mulching and straw mulching can stabilize the variation of soil temperature in soil profile. During the whole freezing and thawing period, the effect of the two mulching treatments on the soil temperature was greater than that of 20 ~ 20 cm. With the deepening of soil depth, the fluctuation range of soil temperature decreased gradually. The research results provide the basis for the selection of surface cover measures in seasonal frozen soil regions.
【作者單位】： 太原理工大學水利科學與工程學院;
【基金】：國家自然科學基金資助項目(41572239,41502243) 高等學校博士學科點專項科研基金資助項目(20131402110008) 山西省自然科學基金資助項目(2015021169)
【分類號】：S152.8

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本文編號：2034730