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选取陇东黄土包气带为研究对象,综合运用数理统计与对比分析相结合的方法,研究黄土地区包气带土壤水分、水势变化特征和土水势构成结构,结果发现,在陇东黄土塬区,坡头荒地等较干旱、沙质土壤中,包气带水分变化呈对数分布特征,而耕作土壤其水分含量特征则不满足这种类型。在土水势构成方面,溶质势所占比例平均约为20%,其中坡头荒地约占15%,耕地中约占25%;基质势所占比例最大,在坡头荒地占近80%,耕地样本的平均比例超过60%。溶质势各分势构成方面,起主导作用的阴离子为HCO3-,起主导作用的阳离子为Ca2+。黄土塬区HCO3-和Ca2+所占溶质势的比重分别约为50%和25%;Na+和Cl-各约占10%。
In this paper, we select the loess aeolian belt in the east of Gansu as the research object. By combining the methods of mathematical statistics and comparative analysis, this paper studied the characteristics of soil moisture and water potential and the composition of soil-water potential in the aeration zone of the Loess Plateau. , And barren wasteland. In the sandy soil, the variation of moisture in the aeration zone showed a logarithmic distribution, while the characteristics of moisture content in the cultivated soil did not satisfy this type. In terms of soil water potential composition, the proportion of solute potential is about 20% on average, of which about 15% of the headland wasteland and about 25% of the cultivated land; the largest proportion of matrix potential, accounting for nearly 80% The average sample size is over 60%. For the formation of soliton potential, the anions that play a leading role are HCO3- and the dominant cation is Ca2 +. The proportion of HCO3- and Ca2 + in the loess plateau is about 50% and 25% respectively, while Na + and Cl- each account for about 10%.