施肥对红三叶群落营养元素含量和积累量的影响

The effect of fertilizer application on content and accumulative amount of nutrient element in Trifolium pratense community.

本文研究了施肥对红三叶群落地上部和地下部 1 0种营养元素的影响 ,结果如下 :( 1 )从含量看 ,施氮肥后 ,地上部B明显降低 ,地下部B明显升高 ;施磷肥后 ,地上部N、B显著下降 ,地下部K、P、N上升幅度较大。 ( 2 )就积累量而言 ,施氮肥后 ,地上部大多数元素增高 ,地下部多数元素降低或无变化 ;施磷肥后 ,无论地上部还是地下部 。

The effects of fertilizer application on content and accumulative amount of 10 nutrient elements in the aboveground and underground portion of Trifolium pratense community were studied.The chief results obtained were as follows:(1)In relation to content,B content of aboveground portion reduced markedly and of underground portion increased obviously after applying N fertilizer.N and B contents of aboveground portion decreased markedly;the declined range of K,P and N of underground portion were great after applying P fertilizer.(2)As regards accumulative amount,the majority of the elements in underground portion descended or stabilized after applying N fertilizer.No matter what the aboveground and underground portion,most of the elements all raised after applying P fertilizer.