摘要
调查分析了江苏省连云港、铜山、泗洪、南京、宜兴等5个丘陵地区类黄土发育的土壤。结果表明,以土壤剖面表下层的粉/粘比及其非粘粒部分的TiO_2和Fe_2O_3含量等三项指标检验,省境內各地区类黄土母质的性质是逐渐变异的,很难截然划出下蜀组和戚咀组的界限。母质在性质上的这种变异特点,是类黄土所发育土壤呈现多样性的原因之一。参照《中国土壤系统分类(首次方案)》的标准,省境内丘陵区类黄土所发育的土壤可归入2土纲6土类(硅铝土纲的褐土、棕壤、酸性棕壤和铁硅铝土纲的黄褐土、黄棕壤、棕红壤);以主分量分析为基础的数值分类也得出类似结果,只是少了1个土类(棕壤)。各土壤剖面点在二维平面上的排序图显示,按地理区域围起来的土壤剖面点包括不同的土类,因而土壤带的范围与土类实际分布范围并非重合,而是部分交叠。目前习用的、从南到北区划的黄红壤、黄棕壤、黄褐土、棕壤褐土等3个地带,不能精确表达这一复杂现象。省境內类黄土发育的土壤从南到北虽也表现出一定的地带分异趋势,但各土类实际上是呈犬牙交错式分布,表现出交叠地带性规律。
Soils derived from the loess-like sediments in 5 hill areas of Jiangsu Province were studied.The examination results of the contents of TiO_2 and Fe_2O_3 in non-clay fraction and the silt/clayratio of subsoil samples showed that the properties of loess-like parent materials within Jiangsu Province varied gradually with location, and the boundary between Xiashu group and Qizui group of loess-like sediments was hard to ascertain. Such variation was one of the reasons that diversified soils from the loess-like sediments.In the hill areas of Jiangsu Province, referring to Chinese Soil Taxonomic Classification (1st scheme), soils derived from loess-like sediments could be allocated into 6 soil great groups under 2 soil orders, i.e., cinnamon soil, brown earth, acidic brown earth of Siallisols and yellowcinnatnan soil, yellow-brown soil and brown-red soil of Ferosiallisols. Soil numerical classification based on the principal component analysis reached a similar conclusion except that brown earth was absent. The ordination of various soils on the coordinate plane of component 1 against component 2 showed that soil plots within the circle of a geographical area included various soil great groups. Therefore, the actual distribution range of a soil great group did not coincide with the limits of the corresponding soil zone but partly overlapped each other. The commonly used zonal spectrum including 3 soil zones, i.e., from south to north there were yellow-red soil zone, yellow-brown soil and yellow-cinnamon soil zone, and brown earth and cinnamon soil zone respectively, could not express this complex situation exactly. Within the boundaries of this province from south to north though a differentiating tendency of various soils derived from loess-like sediments emerged, the distribution of various soil great groups was actually in a jagged, interlocking pattern which showed an overlapping rule of soil zonzlity.
出处
《土壤学报》
CAS
CSCD
北大核心
1993年第2期191-198,共8页
Acta Pedologica Sinica
基金
南京立业大学
江苏省土壤普查办公室
中国科学院南京土壤研究所地理室
关键词
黄土
土壤类型
Soll classification
Soil distribution
Loess-like sediments
Jiangsu Province
