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在长期小麦和玉米轮作的基础上,通过单施化肥以及化肥与其它有机肥料的配合使用,研究不同施肥对河西灌漠土无机磷组分的影响。采用蒋柏藩、顾益初的分级体系[1],对22年有机肥与化肥定位试验中的耕层土壤无机磷组成进行分级。结果表明:供试土壤中Ca-P占无机磷绝大多数,在耕层占71.0%。无机磷各形态含量排列顺序为:Ca10-P>O-P>Fe-P>Ca8-P>Ca2-P>Al-P。与不施肥处理比较,除N处理外各处理均可增加耕层各形态无机磷含量;同时显示厩肥处理对土壤无机磷库的贡献大,可显著增加总无机磷含量。N处理的耕层土壤中,作为土壤有效磷源的Ca2-P、Ca8-P、Al-P含量比对照CK还低。比较2003年与2006年耕层数据,Ca10-P在试验各处理均略有下降,且下降幅度相近。Ca8-P、Ca2-P、Al-P含量除在CK、N处理下降外,在其余处理时均有增加;O-P除在CK处理下降外,在其余处理时也均有增加;Fe-P除在CK、N处理中下降外在M、MN处理时也有小幅度下降,在加磷的处理中均增加。
Based on the long-term rotation of wheat and corn, the effect of different fertilizers on the inorganic phosphorus fractions in Hexi Irrigation Desertified Soil was studied through the application of chemical fertilizers and chemical fertilizers together with other organic fertilizers. Using the classification system of Jiang Baofan and Gu Yichu [1], the composition of inorganic phosphorus in topsoil of 22-year organic fertilizer and chemical fertilization experiment was graded. The results showed that Ca-P accounted for the vast majority of inorganic phosphorus in the soil tested, accounting for 71.0% of the topsoil. The order of inorganic phosphorus content is: Ca10-P> O-P> Fe-P> Ca8-P> Ca2-P> Al-P. Compared with the non-fertilization treatments, all the treatments except N increased the content of inorganic phosphorus in the topsoil. At the same time, it showed that the contribution of manure treatment to the soil inorganic P reservoir was large, and the total inorganic phosphorus content could be significantly increased. N, the content of Ca2-P, Ca8-P and Al-P in soil topsoil was lower than CK. Comparing the 2003 and 2006 topsoil data, the Ca10-P decreased slightly in all treatments, and the decreasing range was similar. The content of Ca8-P, Ca2-P and Al-P increased except for CK and N treatment, but increased in the other treatments except OP and CK. In the CK, N treatment decreased external M, MN treatment also had a slight decrease in the treatment of phosphorus were increased.