贵州省栎类土壤发生层特征及对土壤有机碳密度的影响

摘要

The study uses field investigation and laboratory analysis methods to analyze oak woodland soil layer characteristics and the occurrence of soil organic carbon density characteristics and the occurrence of layer effects on organic carbon density.The following conclusions are:1 )With increasing altitude,oak woodland soil layer distribution occurs significantly,and the outside layer of soil genesis climate impact Zunyi and Tongren increases significantly;2 )With the increase of soil depth,organic carbon content in Zunyi and Tongren shows a downward trend,showing a rising trend in soil bulk density and organic carbon density fluctuation is violent in Zunyi ;southwestern Guizhou Qiannan organic carbon density changes and trends are complicated,soil bulk density changes are in the rise;3 )With sea level rise,organic carbon density is in the overall upward trend,which in southwest Guizhou plot altitude,soil organic carbon densi-ty was the lowest;Zunyi plots are at highest elevation,and soil organic carbon density maximum;4)Pear-son index and significant index research shows that oak woodland organic carbon density generating layer of soil showed some correlation,but the correlation was not significant.%采用野外实地调查和室内实验分析相结合的方法，以贵州栎类林地为对象，研究分析栎类林地土壤发生层特征和土壤有机碳密度特征以及发生层对有机碳密度的影响。结果表明：1）随着海拔不断上升，贵州省内栎类林地土壤发生层分布特征显著，且土壤发生层受外界气候影响显著性不断增加。2）随着土层深度增加，遵义和铜仁有机碳含量呈现下降趋势，土壤容重呈现不断上升趋势，且遵义有机碳密度变动幅度剧烈；黔南和黔西南有机碳密度变化趋势复杂，土壤容重变化呈现上升趋势。3）随着海拔上升，有机碳密度整体呈现上升趋势，其中黔西南样地海拔最低，土壤有机碳密度含量最低；遵义样地海拔最高，且土壤有机碳密度最高。4）Pearson指数和显著性指数研究表明，栎类林地有机碳密度与土壤发生层呈现一定相关性，但相关性不显著。