摘要
为阐明长期施用氮磷钾化肥(NPK)以及化肥有机肥配施(NPKM)对土壤无机磷组分的影响,采用蒋柏藩-顾益初无机磷分级体系,观测了我国6种典型农田土壤-红壤、紫色土、潮土、塿土、灰漠土和黑土15年长期施肥土壤无机磷形态和Olsen-P含量的变化。NPKM能比NPK更显著地增加土壤中全磷含量;能显著提高土壤Ca2-P的含量,在塿土中其提高量是NPK处理的4.07倍。施肥主要是增加了Ca8-P、Al-P和Fe-P含量,红壤Al-P、Fe-P增加量最大,分别达到237.7 mg kg-1和277.7 mg kg-1;NPKM对增加土壤Olsen-P含量的效果更加显著,在黑土和红壤中,其含量分别高达121.4 mg kg-1和98.4 mg kg-1;塿土和黑土Olsen-P含量比试验开始时分别增加了18.4和9.1倍。化肥有机肥配施对增加无机磷各组分和速效磷含量效果显著,主要增加Ca8-P、Al-P和Fe-P等活性较高的无机磷,黑土和红壤中Olsen-P含量达到较高水平,Ca8-P、Al-P或Fe-P为Olsen-P的主要磷源。
Changes of inorganic phosphorus under long-term combined application of chemical and organic fertilizer were studied.With a scheme developed by Jiang Baifan and Gu Yichu for fractionalizing inorganic-P in calcareous soil,changing mechanics of inorganic phosphorus with the situation of 15-year long-term fertilization in 6 typical arable soils（Red Soil,Purple Soil,Fluvo-aquic Soil,Loess Soil,Grey desert Soil and Black Soil） in China were studied.Combined application of chemical and organic fertilizer（MNPK） had increased total phosphorus more significantly than chemical fertilizer（NPK）.Ca2-P increased significantly in the MNPK treatments,and reached 4.07 times than NPK treatments in loess soil.Fertilization mainly increased the content of Ca8-P,Al-P and Fe-P.The largest increases were the contents of Al-P and Fe-P in red soil,which was reaching to 237.7 mg kg-1 and 277.7 mg kg-1.Olsen-P increased significantly in MNPK treatments in all kinds of soils,which was reaching to 121.4 mg kg-1 and 98.4 mg kg-1 in black soil and red soil.Olsen-P also increased 18.4 and 9.1 times than original soil in Loess soil and Black soil.With the combined application of chemical and organic fertilization,all forms of inorganic phosphorus and Olsen-P increased significantly in the six kinds of soils,especially Ca8-P,Al-P and Fe-P.The content of Olsen-P reached a higher lever in black soil and red soil.Ca8-P and Al-P or Fe-P was main sources for Olsen-P.
出处
《土壤通报》
CAS
CSCD
北大核心
2010年第6期1434-1439,共6页
Chinese Journal of Soil Science
基金
"973"项目:磷钾循环过程
有效性机制及其影响因素(2005CB121102)
自然基金:稻田土壤磷素的积累规律
预测模型与归宿研究(30971868)资助
关键词
长期施肥
有机肥
农田土壤
无机磷
Long-term fertilization
Organic fertilizer
Arable soils
Inorganic phosphorous
