喀斯特山区石灰性水稻土部分发生特征研究

A Preliminary Study on the Segment Characteristic of Calcareous Paddy Soil in Karst Mountain of Guizhou Province

通过对贵州喀斯特山区不同生态环境下的石灰性水稻土及其起源土壤中碳酸钙、有机质和各形态铁氧化物等含量的测定,探讨了土壤剖面上碳酸钙、有机质及各种形态铁的分异特征,表明石灰性水稻土发育过程中,土壤剖面上碳酸钙、有机质、各形态铁含量的分异状况主要受水耕熟化过程的影响,碳酸钙含量还受母质遗传作用的影响,可以用有机质、各形态铁的A/C或C/A值来反映水稻土剖面的分异程度,这对进一步探讨喀斯特山区石灰性水稻土的分类具有重要意义。

With the quantification of the contents of organic matter, iron oxide or calcium carbonate, the paddy soil character formed at different ecology environments in Karst mountain of Guizhou Province was investigated in the present work. The results revealed that the contents of calcium carbonate, soil organic matter or iron oxide in soil profile were mainly influenced by the tillage of paddy soil, and the content of calcium carbonate was also affected by the character of parent soil material. A/C or C/A of soil organic matter and all kinds of iron oxide could reflect the differentiation degree of paddy soil profile. The results are of high importance for the further classification of calcareous paddy soil in Karst Mountain.