外源腐殖酸对棕壤有机磷组分的影响

Influence of composition of organic phosphorus on fertilizing outside source of humic acid in brown soil

采用Bowman和Cole提出的有机磷分组方法,对施入外源腐殖酸条件下,不同时期棕壤有机磷的组成变化进行测定。结果表明,施入外源腐殖酸,在培养的各个时期,有机磷各组分所占比例的基本格局没有改变,依然是中等活性有机磷>中等稳定性有机磷>高稳性有机磷>活性有机磷。施入外源腐殖酸后,在培养的30 d,活性有机磷均下降;在培养的60 d和90 d,施入高量腐殖酸的土壤,活性有机磷升高。施入外源腐殖酸,在培养的各个时期均可明显增加中等活性有机磷的含量,特别是在施入高量腐殖酸时增加的最多;同时还可降低中等稳定性有机磷的含量,在施入高量腐殖酸时降低的最多。

Variation of brown soil organic phosphorus fractions in humic acid were studied with Bowman-Cole method. The results the structure of organic phosphorus fraction had not changed, still different periods after indicated that ： （1） application of outside source of In every period of cultivation, was： moderately liable organic phosphorus 〉 moderately stable organic phosphorus 〉 highly stable organic phosphorus 〉 liable organic phosphorus. （2） The liable organic phosphorus all decreased after application of outside source of humic acid in 30 days cultivation. The liable organic phosphorus increased after application of highest humic acid in 60 and 90 days cultivation. （3） The moderately liable stable organic phosphorus obviously increased in all periods of cultivation after application of outsides source of humic acid, especially fertilizer in highest humic acid increased at most. （4） The moderately stable organic phosphorus decreased after application of outside source of humic acid, especially fertilizer in highest humic acid decreased at most.