大巴山北坡土壤研究中几个有关问题的探讨

针对大巴山北坡土壤形成、分类和分布中存在的主要问题，在野外调查、室内化验的基础上，结合生物气候带的垂直变化，综合分析认为：黄棕壤、黄褐土之间差异明显，应该在土类以上的级别上区分开来；两类土壤分异的主要原因是母质差异，而非水热条件，故可在同一地带内出现，不存在９００～１０００ｍ的分界线；黄棕壤、黄褐土分布的上界为１２００ｍ．按照系统分类体系，大巴山北坡土壤垂直带谱为粘磐湿润淋溶土＋铁质湿润淋溶土－简育湿润淋溶土－暗沃＋简育冷凉淋溶土。

Discussion on the Relevant Problems Existing in the Study of the Soil on the North Slope of Daba Mountain

On the basis of the data from outdoor investigation and indoor analysis, and in the light of the vertical variation of bioclimatic belts, the results, aimed at the main problems of the formation, classification and distribution of the soils on the north slope of Daba Mountains, are obtained as follows: the differences between yellow brown soil and yellow cinnamon soil are significant, and they should be divided in groups; the main causes of the differences are the variety of the parent materials rather than soil moisture and temperature regimes, therefore, they may exist in the same zone, and there is no boundary line on the altitude from 900m to 1000 m; the distribution of yellow brown soil and yellow cinnamon soil is below the altitude of 1200m in the western section.According to the Chinese Soil Taxonomy System, the soil sequence going upwards from the mountain foot on the north slope of Daba Mountain is Arp-Udic Luvisols+Fer-Udic Luvisols-Hap-Udic Luvisols-Mol-Boric Luvisols+Hap-Boric Luvisols.