苏南丘陵主要森林类型土壤微量元素含量及其动态特性

以苏南丘陵主要森林类型土壤为对象,分析测定了土壤中微量元素Fe,Mn,Cu,Zn,Mo,B的全量和有效量.并对林木叶、枯落物和土壤微量元素的动态特性进行了分析.结果表明：该地区森林土壤全量B,Zn,Mn低于全国平均水平,属低B区;Fe,Mn,Cu全量较为丰富.有效态B,Mo,Cu含量很低,处于临界含量水平以下;有效2n含量稍高,有效Fe,Mn特别丰富.毛竹叶片对各微量元素有较为突出的富集作用;林木叶、枯落物和土壤微量元素的动态变化随林分类型和元素不同而异.与叶相比,土壤微量元素的变幅较大、枯落物是森林土壤微量元素的重要供应库.

Contents and Dynamics of Microelements in Soils under Main Forest Stands in the Hilly Regions of Southern Jiangsu Province

This paper deals with the microelement (including B, Mo, Cu, Zn, Fe and Mn)status in soils under different forest stands in the hilly regions of southern Jiansu Province. The available and total contents of microelements in forest soils and the total contents in leaves,needles and forest floor were analyzed,and the dynamics of those microelements was also studied. Results reveal that the lobal contents of B,Zn and Mn in these regions are all lower than the average contents in the country,and those of Mo,Fe,and Cu are relatively high. The contents of available B,Mo and Cu are very low,that of Zn is a little higher,and the elements and of Fe, Mn are rich in these regions. The dynamics of microelements in leaves, forest floor and soils changes with the forest stands and microelements themselves. Forest floor is the important source of microelements in forest soils.