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作 者 ：黄庆海1;赖涛1;吴强2;李茶苟1;吴建华1;赵美珍1

期 刊 ：植物营养与肥料学报 2003年 9卷 1期 页码：63-66

关键词：红壤性水稻土；长期施肥；有机磷组分；

Keywords:paddy soil of red earth, long-term fertilization, forms of organic phosphorus,

摘 要 ：以19年肥料长期定位试验为背景,应用Bowman和Cole的有机磷分组方法,对红壤性水稻土有机磷组分及其变化进行了研究。结果表明:红壤性水稻土耕层有机磷含量较高,为225.93～322.47mg·kg^-1,占土壤全磷的28.59%～42.34%。土壤有机磷各组分中以中度活性有机磷含量最高,平均为134.80mg·kg^-1,占有机磷总量的51 58%;中度稳定性有机磷(92.46mg·kg^-1)占35.38%;高度稳定性有机磷(20.35mg·kg^-1)占7.79%;活性有机磷含量最低(13.67mg·kg^-1),占5.23%;长期施肥对土壤各组分有机磷量产生影响,耗磷处理,主要是中度活性有机磷和活性有机磷下降,降低量以CK>NK处理。施磷主要促进中度稳定性有机磷和高度稳定性有机磷的增加,增加幅度以NPK+OM>P>NPK处理。不同施肥措施对土壤有机磷和无机磷库的耗竭或积累速度是不同的,耗磷条件,土壤有机磷/无机磷的比值上升,施磷使有机磷/无机磷比值下降.土壤供磷强度与有机磷/无机磷的比值呈显著负相关(r=-0.9497^* ,r_0.05=0.878)。

Abstract:Based on the longterm fertilization experiment (19 years) in paddy soil derived from red earth, the method of Bowman and Cole (1978) was applied to study the effect of longterm fertilization on the forms and change of organic phosphorus in paddy soil The results showed that the organic phosphorus contents were 225.93 to 322.47 mg·kg^-1 in surface soil, accounting for 28.59% to 42.34% of the total P. In the various forms of organic P in paddy soil, MLOP was highest (13480 mgkg^-1), accounting for 51.58% of total organic P, followed by MROP (92.46 mg·kg^-1, 35.38%), HROP (20.35 mgkg^-1, 7.79%), and LOP (13.67 mg·kg^-1, 5.23%) In the treatment of no P application, it mainly caused the contents of MLOP and MROP to decrease, and the decreased amount was CK>NK. MROP and HROP contributed most to the increase of organic P with continual P application, and the order of the increase was NPK+OM>P>NPK The change rate of organic P was different from that of inorganic P under different fertilization treatments The ratio of organic P to inorganic P rose in the no P application, but declined in the continual P application The P supplying capacity was negatively correlated with the organic P/inorganic P ratio (r=-0.9497^* ,r_0.05=0.878)

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