岳麓山坡面林下土壤有机质分布特征研究

Reseach on Distribution Characteristics of Soil Organic Matter on Woodland Slope of Yuelu Mountain

运用统计学分析方法对岳麓山坡面土壤有机质、pH的空间特征及相互关系进行分析研究。结果表明:(1)有机质含量在8.05g/kg到13.8g/kg之间。0-20cm土层有机质含量为坡下﹤坡中﹤坡上,受人类活动、地表植被、枯枝落叶等覆盖物影响;20-40cm土壤层有机质含量从坡下往坡上呈先略微减小后增大趋势;40-60cm土层有机质含量从坡下往坡上呈递减趋势。(2)有机质质量分数在1.85%-3.17%之间,pH值在2.78-4.01之间。除0-20cm土层pH、20-40cm土层有机质为弱变异性外,其它层次均表现中等程度变异性。土壤pH为坡上<坡下<坡中,跟土壤母质、地表植被盖度和人类活动相关。除坡下土壤pH存在弱变异性外,其余不同坡位有机质、pH为中等程度变异性,两者的相关性达到显著性水平(P<0.05)。

The spatial characteristics and correlations of soil organic matter and pH in Yuelu Mountain were analyzed with the statistical analysis method. The results show that：（ 1） the organic matter content is between8. 05 g/kg and 13. 8 g/kg.In 0-20 cm soil layer,the content of organic matter on the lower slope is lower than that of the middle slope which is lower than that of the upper slope,and soil organic matter is affected by human activities,surface vegetation,litter and so on. The content of organic matter shows a slight decreasing and then increasing trend from the lower slope to upper slope in 20-40 cm soil layer and a decreasing trend from the lower slope to upper slope in 40-60 cm soil layer.（ 2） the organic matter mass fraction is between 1. 85% and 3. 17%,and the pH is between 2. 78 and 4. 01.In addition to 0-20 cm soil pH,20-40 cm soil mass fraction showing weak variability,the other levels show moderate degree of variability,and the soil pH on the upper slope is lower than that of the lower slope,which is lower than that of the middle slope,which is related to the soil parent,surface vegetation coverage and human activities. In addition to the weak variability of soil pH under the slope,the organic matter mass fraction at different slope positions and the pH are moderately variable,and analysis of variance shows that the difference doesn’t reach the level of significance（ P〈0. 05）.