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作 者 ：赵海涛;封克;汪晓丽;盛海君

期 刊 ：植物营养与肥料学报 2007年 13卷 1期 页码：33-38

关键词：施磷；无机磷形态；土层分布；移动；水稻土；

Keywords:phosphorus fertilizer application, inorganic phosphorus fractions, soil layer distribution, move, paddy soil,

摘 要 ：通过3年田间肥料定位试验,采用顾益初、蒋柏藩的石灰性土壤无机磷分级方法,研究了太湖地区砂壤质渗育性水稻土不同无机磷形态在0—15.cm、15—30.cm和30—45.cm土层的分布及移动特征。结果表明,太湖地区砂壤质渗育性水稻土中的无机磷以Ca-P为主,其中Ca₁₀-P含量最高。无论施肥与否,各土层中不同形态无机磷的含量都是Ca₁₀-P>O-P、Fe-P>Al-P、Ca₂-P、Ca₈-P。3年定位施磷后,随施磷量增大表层(0—15.cm)土壤中总磷、Olsen磷、无机磷和无机磷各组分含量显著增加,而15—30.cm和30—45.cm土层中各无机磷组分的增加相对较小。土壤中总磷、无机磷和Olsen磷在土壤剖面中向下移动性随着土层的加深而减弱。其移动性呈Olsen磷>无机磷>总磷。植物有效无机磷源(Ca₂-P、Ca₈-P、Al-P)的下移比植物无效或缓效无机磷源(Ca₁₀-P、Fe-P、O-P)的下移更明显。Olsen磷与土壤各层中的Ca₂-P、Ca₈-P、Al-P的相关性要比Fe-P、O-P和Ca₁₀-P更大。

Abstract:A three-year field experiment was conducted to study the effects of phosphorus fertilization on the distribution of different inorganic P fractions of the percogenic paddy soil in Taihu region.The results indicated: Ca-P was the dominant soil inorganic P in Taihu region,among which the content of Ca₁₀-P was the highest.No matter P fertilizer was(applied) or not,the contents of inorganic P fractions showed same tendency in all three layers: Ca_{10/sub>P > O-P and Fe-P > Al-P and Ca2-P and Ca8-P.After three years P application at same site,contents of total-P,Olsen-P,inorganic P,and inorganic P fractions at surface soil layer(0—15 cm) were increased remarkably,but in the deeper layers(15—30 and 30—45 cm) no significant increase was observed.The movability of totalP,inorganic P and Olsen-P to deeper layer was descended with soil depths.The movability of Olsen-P,was the highest followed by inorganic P and total P. Plant available organic P(Ca2-P,Ca8-P,Al-P) had higher downward movability than plant no/slow available P(Ca10-P,Fe-P,O-P).The correlations between Olsen-P,and Ca2-P,Ca8-P, and Al-P at these three layers were more significant than that between O-P and Fe-P,O-P,and Ca10-P.}

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