为研究森林草原交错区不同坡向沟塘草甸土壤化学计量特征,以内蒙古阿尔山市的沟塘草甸为研究区域,通过野外调查与室内实验相结合的方法,对阴坡阳坡不同深度土层有效微量元素(Fe,Mn,Cu,Zn)含量及有机C,全N,全P含量进行比较分析,探究沟塘草甸土壤化学计量特征。结果表明:1)阴坡阳坡土壤有效Fe和有效Mn含量均随着土层深度增加呈现先增后减趋势,而有效Cu含量随着土层深度变化差异不显著;2)阴坡阳坡土壤有效微量元素含量均呈现Fe>Mn>Zn>Cu趋势;3)土壤有效微量元素含量与pH值无相关性,有效Fe含量与有效Mn、有效Cu、有效Zn含量相关性(P<0.01)极为显著;4)同一坡向不同深度土层C:N,N:P差异均不显著,而C:P差异显著;5)土壤pH在不同坡向不同深度土层均无显著差异。研究结果为沟塘草甸土壤微量元素分析提供数据支持。

In order to study the soil stoichiometric characteristics of swamp meadow in different slope directions and different depths in the forest-steppe ecotone,gully,pond and meadow in Arxan City,Inner Mongolia were taken as research areas,the contents of available trace elements(Fe,Mn,Cu,Zn) and organic C,total N,total P in different depth soil layers of shady slope and sunny slope were compared and analyzed through field investigation and indoor experiment.The results show that:1) The contents of available Fe and available Mn in shady slope and sunny slope soil first increased and then decreased with the increase of soil depth,and the difference of available Cu content was not significant with the change of soil depth.2) The contents of available trace elements in the soil showed the trend of Fe > Mn > Zn > Cu.3) There was no correlation between the contents of available trace elements and pH value,but the contents of available Fe,available Mn and available Cu.The correlation of available Zn content(P<0.01) was significant.4) There was no significant difference in C:N,N:P in different depth soil layers of the same slope aspect,but there was significant difference in C:P.5) There was no significant difference in soil pH in different depth soil layers of different slope aspect.The results of this study provide data support for the analysis of trace elements in the soil of ditches,ponds and meadows.