【摘要】：選取我國中南地區(qū)不同發(fā)育程度典型旱作土壤為研究對象,通過測定土壤基本理化性質(zhì)與滴水穿透時間(WDPT),探究了該區(qū)域土壤斥水性變化規(guī)律及其影響因素。結(jié)果表明,(1)自北向南,隨著水熱條件增加,土壤p H值逐漸降低,游離氧化物(Fed、Ald)逐漸增加,非晶質(zhì)氧化物(Feo、Alo)沒有明顯的地帶性變化;表層有機質(zhì)量高于下層,而林地表層高于耕地表層;(2)供試土壤均為親水性土壤,WDPT分布在0.47~4.00 s之間,自北向南土壤斥水性整體呈逐漸降低的趨勢;(3)WDPT與p H值、CEC、粉粒量顯著正相關(guān)(r0.54,p0.05),砂粒量、非晶質(zhì)氧化鐵(Feo)、游離氧化鐵、鋁(Fed、Ald)與WDPT呈負相關(guān)關(guān)系(r-0.56,p0.05)。逐步回歸分析表明,Fed和Feo對土壤斥水性的影響最顯著(R2=0.71,p0.01),可以用來評價和預(yù)測土壤斥水性。
[Abstract]:Typical dryland soils of different developmental degrees in the central and southern regions of China were selected as the research objects. The variation of soil water repellency and its influencing factors were studied by measuring the basic physical and chemical properties of soil and the time of water dripping through (WDPT),. The results showed that: (1) from north to south, with the increase of hydrothermal conditions, the pH value of soil gradually decreased, the free oxide (Fedo Ald) increased gradually, the amorphous oxide (FeoC Alo) had no obvious zonation change, and the surface organic mass was higher than that of the lower layer. However, the surface layer of woodland was higher than that of cultivated land, (2) the hydrophilic soil WDPT was distributed in the range of 0.47 ~ 4.00 s, and the water repellency decreased gradually from north to south. (3) WDPT and pH value were positively correlated with the amount of silt (r0.54p0.05). There was a negative correlation between (Feo), free iron oxide and aluminum (Fedo Ald) and WDPT (r-0. 56% p0. 05). Stepwise regression analysis showed that the effects of Fed and Feo on soil hydrophobicity were the most significant (R22.71p0.01), which could be used to evaluate and predict soil hydrophobicity.
【作者單位】： 華中農(nóng)業(yè)大學資源與環(huán)境學院;湖北省水利水電科學研究院;
【基金】：國家自然科學基金青年科學基金項目(41401317);國家自然科學基金項目(41401303) 華中農(nóng)業(yè)大學大學生科技創(chuàng)新基金項目(2015081)
【分類號】：S152.7

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