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以27年定位试验的黑土为对象,研究了长期不同施肥处理的黑土中无机磷组分的变化。结果表明,与不施肥相比,长期施用NP或NPK化肥显著增加黑土中Ca8-P、Ca10-P、O-P的含量,增加比率分别为435.9%和402.2%,38.3%和32.8%,28.6%和23.9%,而Ca2-P、Al-P、Fe-P无明显变化;秸秆或猪厩肥长期配施NPK化肥均可显著增加Ca2-P、Al-P和Fe-P的含量,增加比率分别为221.6%和221.8%,89.6%和40.9%,31.0%和15.6%,而猪厩肥配施NPK化肥使O-P降低不显著,仅为0.55%和0.88%,Ca8-P、Ca10-P无明显变化。秸秆或猪厩肥长期配施NPK化肥与单施NPK化肥相比,显著增加Ca2-P、Al-P、Fe-P的含量,增加比率分别为216.4%和216.6%,93.1%和43.5%,22.9%和8.44%;且Ca2-P的含量尤为突出。长期秸秆配施NPK化肥与长期猪粪配施NPK化肥相比,Al-P、Fe-P的增加含量更加突出。
The changes of inorganic phosphorus fractions in black soil treated with long-term fertilization were studied on 27-year-planted black soil. The results showed that the long-term application of NP or NPK fertilizer significantly increased the content of Ca8-P, Ca10-P and OP in black soil compared with no fertilization, with the increasing rates being 435.9% and 402.2%, 38.3% and 32.8%, 28.6% and 23.9%, while Ca2-P, Al-P and Fe-P showed no obvious changes. Straw or stable manure could significantly increase the content of Ca2-P, Al-P and Fe-P with NPK 221.6% and 221.8%, 89.6% and 40.9%, 31.0% and 15.6%, respectively. However, the pig manure supplemented with NPK fertilizer did not significantly reduce OP, only 0.55% and 0.88%, while Ca8-P and Ca10-P did not change significantly. Compared with NPK alone, NPK fertilizer significantly increased the contents of Ca2-P, Al-P and Fe-P by straw or pig manure in 216.4% and 216.6%, 93.1% and 43.5%, 22.9 % And 8.44%; and Ca2-P content is particularly prominent. Compared with long-term pig manure application of NPK fertilizer and long-term straw NPK fertilizer, Al-P, Fe-P increased more prominent.