摘要
在江苏省宁镇、宜溧和江西省东北部三个低山区,以20个代表性土壤剖面作典范变量分析,结果表明,在典范变量1、2构成的直角坐标平面上,按这三个低山区划分的4类土壤(基性岩发育的黄棕壤、普通黄棕壤、红黄壤、红壤),置信区间交叠,土壤个体之间的性质为连续变化、逐渐过渡。从中可见,各区内土壤个体都包括不同发育阶段的产物。参照中国土壤系统分类方案(1987),可把这三个低山区的土壤划归4纲7类中的8个亚类,土壤类型在总体上仍表现出从北向南逐渐由硅铝土过渡到铁铝土,以及每一地区由初育土逐渐过渡到成熟土的总趋势,但各亚类界线与三个地区的地理分界线并不完全重合。根据南京附近低山丘陵地区70个土壤剖面的数据,以及相应标准地上的林木生长状况,将上述各亚类再划分为共计10个土壤生态型。
In three low mountain areas. including those in Nanjing-Zhenjiang and Yixing-Liyang districts of Jiangsu Province and the northeast district of Jiangxi Province, 20 representativesoil profiles with perfect data were collected for canonical variate analysis. The computing results show that on the coordinate plane of canonical variate 1 against canonical variate 2, 90 per cent confidence circles of 4 soil great groups classified in accordance with their zonal distribution in three low mountain areas respectively, i.e. basic yellow brown soils and othic yellow brown soils in Nanjing-Zhenjiang district, red yellow soils in Yixing-Liyang district and red earths in the northeast district of Jiangxi Province, are overlapped each other, and the points representing the individual profiles in character space illustrate that soil individuals evolve and transit each other gradually. In the three areas, all soil individuals embody the products of different developing stages. Refering to Chinese Soil Taxonomic Classification (2nd draft, 1987), soil individuals in those three low nountain areas can be allocated into 8 subgroups of 7 soil great groups under 4 soil orders. The tendencies of soil distribution including both the horizontal transition from Siallisols in the north to Ferallisols in the south and the evolution from Primarosols to mature soils in each areas can be seen in broad outline, but the distributing pattern of subgroups does not fully coincide with the location of geographical zones. The above-mentioned subgroups were divided into 10 soil ecotypes according to soil date and relevant tree growth.
出处
《土壤学报》
CAS
CSCD
北大核心
1990年第1期63-72,共10页
Acta Pedologica Sinica
