【摘要】：為了分析土壤結(jié)構(gòu)對土壤入滲規(guī)律的影響,通過研究云南紅壤土滴灌條件下水分運動特征,采用室內(nèi)外對比試驗,試驗共設(shè)計了3個滴頭流量,分別為2.68,3.74,4.68L/h,土壤容重為1.2g/cm~3,分別進(jìn)行了單、雙點源滴灌入滲試驗,著重分析了原狀土與擾動土在一定的滴頭流量下的濕潤鋒、濕潤體變化特征,揭示區(qū)域土壤水分運移規(guī)律,進(jìn)而為區(qū)域性作物灌水提供參考依據(jù)。結(jié)果表明:(1)原狀土濕潤鋒運移速率比較快,原狀土地表濕潤比隨交匯時間增加的速率快于擾動土,說明濕潤鋒的運移速率與土壤孔隙有關(guān);(2)相同觀測時間下,原狀土濕潤體變化比較快,原狀土濕潤體扁率α大于擾動土,原狀土α=16.53%,擾動土α=45%;(3)原狀土與擾動土含水率等值線變化有相同趨勢,但不重合,疏密程度有差異;(4)原狀土分形維數(shù)比擾動土的小,說明原狀土孔隙分布差異大,擾動土的質(zhì)地較均勻。研究結(jié)果揭示了該地區(qū)原狀土與擾動土水分運動特征,為進(jìn)一步的機理研究提供參考。
[Abstract]:In order to analyze the effect of soil structure on soil infiltration, the characteristics of water movement in Yunnan red loam under drip irrigation were studied. The soil bulk density is 1.2 g / cm ~ (-3) and 2.68 ~ 3.74 ~ 4.68 L / h, respectively. The infiltration tests of single and double point source drip irrigation were carried out respectively. The characteristics of wetting front and wetting body of undisturbed soil and disturbed soil under certain drip discharge were analyzed, and the regional soil moisture migration law was revealed. Then it provides reference for regional crop irrigation. The results are as follows: (1) the velocity of wet front migration in undisturbed soil is faster than that in disturbed soil, which indicates that the migration rate of wet front is related to soil porosity; (2) under the same observation time, the surface wettability of undisturbed soil is faster than that of disturbed soil. The change of wet body of undisturbed soil is faster, the flat ratio of wet body of undisturbed soil is larger than that of disturbed soil, the undisturbed soil 偽 = 16.53, the disturbed soil 偽 = 45. (3) the contour variation of moisture content of undisturbed soil and disturbed soil has the same trend, but does not coincide with that of disturbed soil. (4) the fractal dimension of undisturbed soil is smaller than that of disturbed soil, which indicates that the pore distribution of undisturbed soil is different and the texture of disturbed soil is more uniform. The results reveal the characteristics of water movement of undisturbed soil and disturbed soil in this area, and provide a reference for further study of mechanism.
【作者單位】： 昆明理工大學(xué)現(xiàn)代農(nóng)業(yè)工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51409136) 昆明理工大學(xué)自然科學(xué)研究基金項目(KKSY201423023)
【分類號】：S152.7;S275.6

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