本文關(guān)鍵詞： 土壤水分特征曲線 模型擬合 古爾班通古特沙漠 丘間地　出處：《水土保持學(xué)報》2017年01期 　論文類型：期刊論文

【摘要】：為研究干旱荒漠地區(qū)土壤水分特征的變化規(guī)律并探討土壤水分特征曲線擬合模型的適宜性,以古爾班通古特沙漠南緣丘間地為研究對象,應(yīng)用壓力膜儀測定了丘間地剖面各土層(0—150cm)的土壤水分特征曲線,結(jié)合土壤容重、顆粒分布及飽和含水率等性質(zhì),分析了丘間地不同土層水分特征和孔隙大小的分布狀況,明確了Gardner模型和van Genuchten模型擬合的適用性。結(jié)果表明:(1)丘間地剖面砂質(zhì)土壤釋水量伴隨吸力呈規(guī)律性變化,低吸力段(0~100kPa)各土層水分特征曲線走勢陡直,釋水性強(qiáng);中高吸力段(100~1 500kPa)曲線趨于平緩,持水性強(qiáng)。水分曲線特征與其物理性質(zhì)一致,各土層物理性質(zhì)差異較小,曲線的差異也較小。(2)丘間地剖面各土層大孔隙由上到下不斷增加且20—40cm土層的小孔隙最多,有助于春季積雪融化迅速入滲到土壤里貯存,對植物吸收利用水分有重大意義。(3)兩模型都能很好地擬合丘間地的土壤水分特征曲線,VG模型的擬合效果優(yōu)于G模型,但G模型形式簡單、參數(shù)少且易于求解,更便于實際應(yīng)用。
[Abstract]:In order to study the variation law of soil moisture characteristics in arid desert area and the suitability of fitting model of soil moisture characteristic curve, the study object is Goulbantong Gute desert south margin between hills. The soil moisture characteristic curves of each soil layer in the interdome profile were measured by pressure film instrument. The distribution of soil moisture characteristics and pore sizes in different soil layers were analyzed in combination with soil bulk density, particle distribution and saturated moisture content. The applicability of Gardner model and van Genuchten model was confirmed. The results showed that the water release of sandy soil in the cross-hill profile changed regularly, and the water release curve of each soil layer in the low suction section was steep and strong. In the middle and high suction section, the curve tends to be gentle and has a strong water holding capacity. The characteristics of the water curve are consistent with its physical properties, and the physical properties of each soil layer have little difference. The difference of curve is also small. (2) the porosity of each soil layer increases continuously from top to bottom and the small pore of 20-40 cm soil layer is the most, which is helpful for the snow melt and infiltration into the soil to store rapidly in spring. The two models can fit the soil water characteristic curve between hills very well. The fitting effect of VG model is better than that of G model, but the G model is simple in form, few in parameters and easy to solve, which is more convenient for practical application.
【作者單位】： 中國科學(xué)院新疆生態(tài)與地理研究所荒漠與綠洲生態(tài)國家重點實驗室;中國科學(xué)院大學(xué);北京師范大學(xué)全球變化與地球系統(tǒng)科學(xué)研究院;
【基金】：重大科學(xué)研究計劃項目“973”(2013CB429905) 國家自然科學(xué)基金項目(41601107,41671032,U1303181)
【分類號】：S152.7

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