贵州喀斯特山区植物土壤C、N、S的分布特征

该文研究了贵州喀斯特山区植物和土壤C、N、S含量特征、垂直变化特征以及植物与土壤C、N、S之间、植物-土壤间C、N、S 的相互关系。结果表明:该区植物C、N、S平均含量分别为45.13%、2.02%、0.61%，C、N含量在正常范围内，但S含量明显高于我国其他地区；不同植物种C、N、S含量存在显著差异，不同土壤上植物C、N、S含量差异不显著；石灰土C、N、S含量均高于黄壤C、N、S含量，但两者的C、N、S含量差异未达到显著程度；植物C、N、S随海拔的变化不明显，而土壤C、N、S均明显地随着海拔增加而增加。相关分析表明:植物C、N、S之间、垂直变化上植物与土壤之间C、N、S的相关关系基本不显著，而土壤C、N、S之间存在较显著的相关关系。 

Distribution characteristics of carbon, nitrogen and sulphur of plants and soils in Guizhou karst mountain area, southwestern China

This paper studies the characteristics of the content and vertical changes of carbon, nitrogen and sulphur of plants and soils, and the correlations between carbon and nitrogen, carbon and sulphur, nitrogen and sulphur of plants, soils and plant-soil system in Guizhou karst mountain area, southwestern China. Results showed that the average content of carbon, nitrogen and sulphur was 45.13%, 2.02% and 0.61%, respectively. The content of carbon and nitrogen of plants was normal, but the content of sulphur was higher than that of other areas in China. The content of carbon, nitrogen and sulphur differed significantly in different species; while the differences of the content of carbon, nitrogen and sulphur of the same species growing in varied types of soils were not significant. The content of carbon, nitrogen and sulphur of limestone soils was mildly higher than that of yellow soils, but the differences between limestone soils and yellow soils were not significant. The changes of content of carbon, nitrogen and sulphur of plants with altitude were not significant for all cases, but those of soils were significant. Correlations between carbon and nitrogen, carbon and sulphur, nitrogen and sulphur in plants and plant-soil system were not significant on the whole, while those in soils were significant.