【摘要】 基于无石灰性潮土长期定位试验,研究长期施肥对土壤磷素状况的影响的结果表明,在无石灰性潮土上长期单施有机肥、有机—无机肥配施、氮磷钾配施能提高土壤Ca-P,Fe-P,Al-P的含量,降低O-P的含量。单施氮肥能提高土壤O-P、降低Ca-P含量。单施有机肥及其配施无机化肥比单施无机化肥有机磷增加了15.60%~11.21%,无机磷减少了11.21%~15.60%。土壤有效磷与Fe-P无相关性,与土壤全磷、无机磷、有机磷呈极显著正相关,与Ca-P,Al-P呈显著正相关,与O-P呈极显著负相关。对有效磷贡献(直接通径系数)的相对重要性依次为:O-P(72.6940)>Ca-P(69.9052)>全磷(39.6186)>有机磷(-32.8527)>无机磷(-20.9515)>Fe-P(17.2542)>Al-P(6.4832)。由逐步回归得出土壤无机磷中的O-P,Ca-P以及有机磷是土壤有效磷主要磷源。更多还原

【Abstract】 This experiment was done in the located fertilization experiment of non-calcareous fluro-aquic soil,the effects of long-term located fertilization on the status of phosphorus in soil was studied.The results indicated that: It can improve the contents of soil Ca-P,Fe-P,Al-P,decrease the content of soil O-P that only application of organic fertilizer,combined application of organic fertilizer and inorganic fertilizer,combined application of nitrogen,phosphate and potassium fertilizer.It can increase the content of soil O-P,decrease the content of soil Ca-P,that only application of inorganic N-fertilizer,for long term in the non-calcareous soil.Soil organic phosphorous quality of the treatment of application of organic fertilizer and combined application of organic fertilizer and inorganic fertilizer were increased 15.60%～11.21%,and inorganic phosphorous quality was decreased 11.21%～15.60%.Soil available phosphorous was no related to Fe-P,but was positively related to soil total phosphorous,inorganic phosphorous,organic phosphorous,Ca-P and Al-P.It was negtively related to soil O-P.The order of contribution to available phosphorous(direct path coefficient) is:O-P(72.6940)>Ca-P(69.9052)>total phosphorous(39.6186)>organic phosphorous(-32.8527)>inorganic phosphorous(-20.9515)>Fe-P(17.2542)>Al-P(6.4832).The main source of soil available phosphorous i-P,Ca-P and organic phosphorous in the soil inorganic phosphorous from gradual regression.更多还原