【摘要】：為揭示凍融循環(huán)對土壤物理性質(zhì)及抗沖性的影響,以內(nèi)蒙古坡耕地風(fēng)沙土為研究對象,控制凍融循環(huán)次數(shù)(0~10次)和土壤質(zhì)量含水量(6%,9%,12%)2個因素,在室內(nèi)模擬野外凍融循環(huán)和徑流沖刷過程,定量分析凍融循環(huán)對土壤含水量、容重、孔隙度及土壤抗沖性的影響規(guī)律。結(jié)果表明:(1)土壤含水量隨凍融循環(huán)次數(shù)增加呈緩慢增加的趨勢,增加幅度為0.51%~0.87%,且高含水量土壤增幅比低含水量土壤大;(2)隨凍融循環(huán)次數(shù)的增加,土壤容重和孔隙度分別呈緩慢減小和增大趨勢,且變化幅度逐漸降低,最后達(dá)到基本穩(wěn)定的狀態(tài),達(dá)穩(wěn)定狀態(tài)后的土壤容重比未凍融土壤小(0.05±0.01)g/cm~3;(3)當(dāng)凍融循環(huán)次數(shù)相同時,高含水量(12%)的土壤容重比低含水量(6%)小,而孔隙度和土壤抗沖性的降低幅度與之相反;(4)凍融循環(huán)次數(shù)對風(fēng)沙土抗沖系數(shù)具有顯著影響,試驗(yàn)土樣抗沖性隨凍融循環(huán)次數(shù)的增加呈顯著降低趨勢,但是第6次凍融循環(huán)后,試驗(yàn)土樣的含水量、容重、孔隙度及抗沖性的變化均逐漸趨于穩(wěn)定。研究結(jié)果可為季節(jié)性凍融區(qū)土壤侵蝕機(jī)理研究提供參考。
[Abstract]:In order to reveal the effects of freeze-thaw cycles on soil physical properties and anti-scouring properties, two factors, freeze-thaw cycles (0-10 cycles) and soil water content (6%, 9%, 12%) were controlled in the sandy soil of Sloping Farmland in Inner Mongolia. The freeze-thaw cycles and runoff scouring processes were simulated in the laboratory, and the effects of freeze-thaw cycles on soil water content, bulk density and pore volume were quantitatively analyzed. The results showed that: (1) with the increase of freeze-thaw cycles, the soil water content increased slowly, ranging from 0.51% to 0.87%, and the increase of high water content soil was larger than that of low water content soil; (2) with the increase of freeze-thaw cycles, the soil bulk density and porosity decreased and increased slowly, respectively. The soil bulk density was smaller than that of unfrozen-thawed soil (0.05.01) g/cm~3; (3) When the freeze-thaw cycles were the same, the soil bulk density with high moisture content (12%) was smaller than that with low moisture content (6%), and the decrease of porosity and soil Anti-scourability was opposite; (4) The freeze-thaw cycles were the same. The number of freeze-thaw cycles has a significant effect on the scour resistance coefficient of aeolian sandy soils. The scour resistance of the tested soils decreases significantly with the increase of the number of freeze-thaw cycles. However, after the sixth freeze-thaw cycles, the changes of water content, bulk density, porosity and scour resistance of the tested soils gradually become stable. For reference.
【作者單位】： 西北農(nóng)林科技大學(xué)水土保持研究所;中國科學(xué)院水利部水土保持研究所黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金重點(diǎn)項(xiàng)目(41330858) 西北農(nóng)林科技大學(xué)博士科研啟動基金項(xiàng)目(2452015345);西北農(nóng)林科技大學(xué)大學(xué)生創(chuàng)新訓(xùn)練項(xiàng)目(201610712035)
【分類號】：S157.1

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