發(fā)布時間：2018-02-10 04:17

  本文關鍵詞： 秸稈 表層覆蓋 深層覆蓋 雙層覆蓋 蒸發(fā)量 鹽分　出處：《土壤學報》2017年06期 　論文類型：期刊論文

【摘要】：采用室內土柱模擬的方式,研究了秸稈雙層覆蓋對鹽堿土的改良效應及機制,以期對鹽堿地的改良提供理論依據。結果表明:1)與對照相比,不同的秸稈覆蓋模式均能降低土壤水分的累積蒸發(fā)量,T4處理(土表與土表下35~40 cm處覆蓋秸稈量之比為2∶1)在45 d內土壤水分累積蒸發(fā)量較CK(無秸稈覆蓋的對照)低36.73 mm,抑蒸率為65.89%,抑蒸率最大,對土壤水分蒸發(fā)的抑制效果最好。2)秸稈處理均在不同程度上抑制了土壤返鹽,其中T4處理返鹽率最小,遠低于對照處理。3)土壤水分累積蒸發(fā)量與土壤累積含鹽量存在高度正相關關系。4)秸稈雙層覆蓋對土壤水分蒸發(fā)和土壤返鹽的抑制效果大于秸稈表層覆蓋和秸稈深層覆蓋,并且,在不同的秸稈雙層覆蓋的處理中,T4處理的控鹽保水效果最好,是一種較好的改良鹽堿土的方法。
[Abstract]:In this paper, the improvement effect and mechanism of straw double layer mulching on saline-alkali soil were studied by means of indoor soil column simulation, in order to provide theoretical basis for saline-alkali soil improvement. The results showed that the effect of straw double layer mulching on saline-alkali soil was compared with that of control. Different straw mulching models could reduce the cumulative evaporation of soil water (the ratio of mulching straw to soil surface was 2: 1 at 35 ~ 40 cm below the soil surface) and the cumulative evaporation of soil water in 45 days was lower than that of CK (control without straw mulching). 36.73 mm, and the inhibition rate was 65.89 mm. The inhibition of soil moisture evaporation was the best. 2) Straw treatment inhibited soil salt return to different extent, among which T4 treatment had the lowest salt return rate, and T4 treatment had the best inhibition effect on soil moisture evaporation. The effect of straw double layer mulching on soil moisture evaporation and soil salt recovery was much higher than that of straw surface mulch and straw deep mulch, and the effect of straw double layer mulching on soil moisture evaporation and soil salt return was much higher than that of straw surface mulch and straw deep mulch, and there was a significant positive correlation between soil moisture accumulation and soil salt content. Among the treatments with double mulch of straw, T4 treatment has the best effect of controlling salt and keeping water, and it is a better method to improve saline-alkali soil.
【作者單位】： 山東農業(yè)大學資源與環(huán)境學院;
【基金】：山東省重點產業(yè)關鍵技術項目(2016CYJS05A02) 國家自然科學基金項目(31570522)共同資助~~
【分類號】：S156.4

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1 董智君,趙英;黑土有機質含量與土壤水分蒸發(fā)關系的研究[J];農業(yè)系統科學與綜合研究;2000年02期

2 李新舉,張志國;秸稈覆蓋對土壤水分蒸發(fā)及土壤鹽分的影響[J];土壤通報;1999年06期

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本文編號：1499635