Abstract:

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.

Key words: forest-steppe, gully, pond and meadow, soil, trace element