杭嘉湖平原圩-田-塘镶嵌生态系统中土壤养分元素的分布特点

The Distribution of Eight Elements in Soils of the Mulberry Dyke-paddy Field-pond Catena on HangJia-Hu Plain

本研究表明,在杭嘉湖中部平原的圩-田-塘镶嵌生态系统中,圩(桑基)、田、塘表土的Fe,Mn,Cu,Zn和C,N,P,K的含量均比其它农田土壤含量高。其中Fe,Mn,Cu,Zn,P,K元素在圩、田、塘土壤中的各自含量都较接近。水田土壤的C,N含量明显高于桑基土壤。DTPA浸提的活性Fc,Mn,Cu,Zn含量普遍高于一般土壤的平均含量;而它们在圩、田、塘三种土壤间和土壤剖面的不同层次间,DTPA提取量却相差很大。这说明圩-田-塘镶嵌生态系统有利于土壤中养分元素的积累和活化,能较好地维持该系统中土壤养分的平衡。

The distribution of the eight elements C, N, P, K, Fe, Mn, Cu, Zn in soils of the mulberry dyke-paddy field-pond catena on the Hang- Jia-Hu plain was studied. It was shown that all of the eight elements under study were maintained in a higher level as a whole. The content of Fe, Mn, Cu, Zn and P, K is respectively nearly at the same grade in the soils of the mulberry dyke-paddy field-pond. It is obvious that the content of DTAP extractable Fe, Mn, Cu, Zn in this catena is comparatively high. The amounts of C and N in soil of the paddy field are more than those of the mulberry dyke. It may be explained that the ecological system of mulberry dyke-paddy field-pond is beneficial to the equilibrium of nutrient elements in soils.