【摘要】：以寧夏中部旱區(qū)砂田土壤為研究對象,通過對不同礫石覆蓋厚度條件下砂田土壤水分入滲過程進(jìn)行研究,采用一維垂直定水頭入滲法,選取礫石覆蓋厚度為影響因子,設(shè)置5個覆蓋厚度(0,6,9,12,15cm),觀測濕潤鋒運移和入滲量變化規(guī)律,比較各處理土壤入滲特征,利用模型擬合土壤入滲過程。結(jié)果表明,礫石覆蓋提高了土壤水分入滲能力,土壤濕潤鋒運移距離和入滲量明顯增加。與CK相比,礫石覆蓋厚度為6,9,12,15cm時的累積入滲量分別增加了4.3%,11.8%,12.8%和17.1%,平均入滲率增加了25.8%,38.7%,50.0%和62.9%;同時礫石覆蓋厚度改變了土壤水分入滲曲線,隨著礫石覆蓋厚度增加,土壤初始入滲率迅速增加,但穩(wěn)定入滲率增加較為緩慢。與CK相比,礫石覆蓋厚度為6,9,12,15cm時的初始入滲速率分別增加了40%,81%,91%和110%;穩(wěn)定入滲速率分別增加了15.3%,17.9%,20.5%和25.6%。利用3種入滲模型對砂田土壤水分入滲過程進(jìn)行擬合,結(jié)果表明Horton模型擬合效果最好,是分析和預(yù)測不同礫石覆蓋厚度土壤水分入滲過程的適宜模型。
[Abstract]:Taking sandy soil in arid area of central Ningxia as the research object, the process of soil water infiltration in sandy field under different gravel cover thickness was studied. One dimensional vertical water head infiltration method was adopted, and gravel cover thickness was selected as the influencing factor. Five mulch thickness (0 ~ 6 ~ 9 ~ 1 ~ 12 ~ 15 cm) were set up to observe the change law of moisture front migration and infiltration amount, to compare the infiltration characteristics of each treatment, and to fit the soil infiltration process by using the model. The results showed that gravel mulch increased soil moisture infiltration ability, and soil wetting front migration distance and infiltration amount increased obviously. Compared with CK, the cumulative infiltration amount of gravel cover was increased by 4. 3%, 11. 8% and 17. 1%, respectively, and the average infiltration rate increased by 25. 8% and 62. 9%, respectively, and the gravel cover thickness changed the infiltration curve of soil water, which increased with the increase of gravel cover thickness, and the average infiltration rate increased by 25. 8% and 62. 9% respectively, while the gravel cover thickness changed the infiltration curve of soil water, which increased with the increase of gravel cover thickness, and the average infiltration rate increased by 25. 8% and 62. 9% respectively. The initial infiltration rate of soil increased rapidly, but the steady infiltration rate increased slowly. Compared with CK, the initial infiltration rate increased by 400.81% and 110cm, respectively, and the steady infiltration rate increased 15.30.17.9% and 25.6cm, respectively. Three infiltration models were used to fit the soil water infiltration process in sandy fields. The results showed that Horton model was the best fitting model for analyzing and predicting soil water infiltration process with different gravel cover thickness.
【作者單位】： 寧夏大學(xué)資源環(huán)境學(xué)院;寧夏(中阿)旱區(qū)資源評價與環(huán)境調(diào)控重點實驗室;
【基金】：國家自然科學(xué)基金項目(41461104) 寧夏自然科學(xué)基金項目(NZ16026)
【分類號】：S152.7
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本文編號：2219847