施用不同豆科绿肥对酸性土壤无机磷分级的动态影响

The Dynamic Effect of Different Leguminous Green Manures Application on the Acid Soil Inorganic Phosphorus Fractions

采用尼龙袋法,研究酸性土壤施用4种豆科绿肥(尖叶木蓝、铺地木蓝、扁豆与链荚豆)后,在1年内不同时间,土壤无机磷各组分含量的动态变化。结果表明:不同绿肥对于土壤无机磷影响的效果存在显著差异,但总体上施用豆科绿肥可显著降低酸性土壤无机磷的总量,对于土壤无机磷各组分,施用绿肥可显著增加土壤铁磷(Fe-P)以及铝磷(Al-P)的含量,但显著降低土壤中钙磷(Ca-P)以及闭蓄态磷(O-P)的含量;施用绿肥对于土壤无机磷的影响随施肥时间的变化而不同。

There are common problems such as phosphorus deficiency, aluminum toxicity, high acidity and so on in the tropical acid soils, and the application of green manure is an effective measure to solve these problems. The phosphorus in the soil will be changed after the application of green manure, while the soil inorganic phosphorus, as an important phosphorus pool in the soil, maybe changed after the application of green manure. The research on the changes can provide the research reference and evidence for the scientific application of green manure in the tropical acid soil. A nylon bag method was used to research the dynamic change of the acid soil inorganic fractions content during one year period after the application of the 4 tropical green manures [ Indigofera zollingeriana Miq., lndigofera spicata Forssk, Lablab purpureus （Linn.） Sweet, Alysicarpus vaginalis （L inn.） DC.]. The result indicated that the effect of the different green manures application on the acid soil inorganic phosphorus fractions was different, but as a whole, the application of the green manure could decrease significantly the content of the soil inorganic phosphorus; And the content of the Fe-P and AI-P increased significantly due to the application of the green manures, while the content of the Ca-P and O-P decreased significantly. In addition, the result also indicated that the effect of the green manures application on the acid soil inorganic was different significantly with the application time of the green manures.