摘要
根据北京市蔬菜地的分布状况，分别在近郊和远郊选取有代表性的蔬菜保护地，取０～１００ｃｍ深不同土层土样，研究北京郊区蔬菜保护地土壤磷空间及形态分布特征。结果表明，种菜时间越长，土壤中的全磷和有机磷含量也越多。近郊蔬菜保护地６个采样点０～２０ｃｍ土层土壤有效磷（ＯｌｓｅｎＰ）含量平均值为２１１ｍｇ·ｋｇ－１，远郊７个采样点平均值为９５ｍｇ·ｋｇ－１。均远远高于土壤磷大量淋失时的土壤表层有效磷含量。蔬菜保护地土壤全磷、有机质和有效磷均呈表层含量较高，２０ｃｍ以下含量骤减，土层越深含量越低的规律。土壤有机磷则随土层加深缓慢降低。随土层深度增加，有效磷占全磷的比例逐渐下降而有机磷占全磷的比例则逐渐增加；土壤全磷、有机磷、有机质和有效磷四者之间均呈极显著正相关。
The fractions and percentages of inorganic P,organic P and OlsenP in vegetable soils under plastic greenhouse and solar greenhouse conditions were analysed in suburban district of Beijing. The results indicated that the enrichment of phosphorus in the vegetable soils was rapid under the level of fertilization in Beijing. The average of OlsenP in 0-20 cm soil layer was 95-211 mgkg-1,and most of the phosphorus was accumulated in the top soil. The concentration of soil total P,organic matter and OlsenP had a rapid decrease with the depth of the soil. The percentage of organic P increased with the depth of the soil. Organic P was easier to lose in the drainage water than inorganic P.
出处
《中国蔬菜》
北大核心
1999年第4期7-11,共5页
China Vegetables
基金
国家自然科学基金
