长江中游不同潜育化土壤诊断指标探讨

ON A QUANTITATIVE INDEX OF IDENTIFYING SOILS OF VARIOUS GLEIZATION TYPES IN THE MIDDLE BASIN OF THE YANGTZE RIVER

田间原位测定、室内分析和模拟试验的结果表明，长江中游垸（圩）田土壤潜育化过程中发生一系列物质变化，其中以活性还原物质量、Ａｌ２（ＳＯ４）３溶液提取的亚铁量和氧化还原电位三者变化最为显著。活性还原物质量和亚铁量与潜育化作用强度正相关，而氧化还原电位则呈负相关。通过计算机对１３项测定结果作主组元分析并结合土壤形态特征提出了一个适用于该地区区分不同潜育化类型土壤的定量的指标。

Results obtained in the field and in the laboratory showed that a series of material changes occurred in the gleying in which the changes in the amount of active reducing substances and ferrous iron extracted with an Al 2(SO 4) 3 solution and oxidation reduction potential (Eh) are most remarkable. Relationship between active reducing substances, ferrous iron and soil gleization intensity is positive interrelation, while the relationship between the Eh and gleization intensity is negative interrelation. A quantitative index is developed through principal component analysis of thirteen determinations with computer in combination with soil morphological characters, to distinguish various gleization types and it may be used in the middle basin of the Yangtze River.