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本文介绍了研究天宝山垂直带土壤的PZC和PZNC值的大小、随海拔高度的变化及其与土壤物质组成的关系。结果表明:1)黄棕壤、暗黄棕壤、山地棕壤的PZC分别为2.2—3.2,3.8—4.0,3.70—4.0;它们的PZNC分别为<2.1,2.2—2.4,2.5—2.8。土壤PZC、PZNC值均随海拔升高而增大。2)供试土壤PZC与土壤无定形铝、无定形铁氧化物含量显著正相关,但与土壤游离氧化铁含量无显著相关。3)有机质可通过阻碍铝(铁)氧化物的老化,增大其活性表面来提高土壤PZC;但有机质含量过高时,土壤PZC降低。4)就供试山地垂直系列土壤表面电荷性质的特异性与Uehara和Gillman的理论模式相比较进行了讨论。
This paper presents the study of the PZC and PZNC values of soil in the vertical belt of Tianbao Mountain, with the change of altitude and its relationship with soil composition. The results showed that: 1) The PZC of yellow brown soil, dark yellow brown soil and mountain brown soil were 2.2-3.2,3.8-4.0,3.70-4.0, respectively; their PZNC were <2.1,2.2-2.4,2.5-2.8 respectively. Soil PZC and PZNC values increased with elevation. 2) There was a significant positive correlation between soil PZC and amorphous aluminum and amorphous iron oxides, but no significant correlation with soil free iron oxide content. 3) Organic matter can improve soil PZC by hindering the aging of aluminum (iron) oxide and increasing its active surface. However, when the content of organic matter is too high, PZC of soil decreases. 4) The specificity of the surface charge properties of the vertical series of soils for the test mountain is discussed in comparison with the theoretical model of Uehara and Gillman.