白浆土种水稻对土壤磷素形态转化及其有效性的影响

THE EFFECT OF ALBIC SOIL AFTER PLANTING RICE ON SOIL PHOSPHORUS TRANSFORMATION AND AVAILABILITY

本文探讨了白浆土种水稻对土壤磷素形态转化及其有效性的影响。结果表明：草甸白浆土、潜育白浆土的表层以磷酸铁为主，占无机磷的３５５－４９．９％．土壤含水量与速效磷呈正相关．ｒ值为０．８９。淹水６０天，土壤速效磷比灌水前净增５２．５－６４．４ｍｇ／ｋｇ。土壤施入新鲜有机质；可以促使土壤磷素有效化。淹水白浆土速效磷主要来源于磷酸铁盐。

The results showed that the A horizon of Meadow and Gley Albic soils took Fe-Pas major,made up 35.5-49.9% of inorganic phosphorus.The moisture content and available phosphorus in soil present a positive correlation (r=0.89;n=5).In the soil after 60 days submerged,the available phosphorus increased by 52.5～64.4 mg/kg and these available phosphorus mainly come from Fe-P in soils. when applied the fresh organic matter Into the soils.the availability of phosphorus were impelled.