长期定位施肥对棕壤无机磷形态及剖面分布的影响

Effects of Long-term Fertilization on Inorganic Phosphorus Forms and Profile Distribution in Brown soil

对棕壤26年长期定位试验的无机磷分级表明:长期施入有机肥或化学磷肥,除了Ca10-P含量在耕层减少外,其它各形态无机磷含量都有所增加;仅施N肥或不施肥,Al-P,Fe-P,O-P,Ca10-P含量均减少,Fe-P,Al-P,Ca8-P,Ca2-P占无机磷总量的比例增加,而O-P,Ca10-P则下降了。各形态无机磷的剖面分布相似,均为先下降而后略微上升。相关分析和逐步回归分析表明,Ca2-P,Ca8-P,Al-P,Fe-P,O-P与速效磷之间达到1%的极显著水平,Ca10-P与速效磷之间达到5%的显著水平。Ca2-P,Ca8-P对速效磷的贡献最大。

The result of long-term fertilizer experiment on forms of inorganic phosphorus in brown soil showed that long-term application of chemical phosphorus or organic phosphorus fertilizer,the contents of the inorganic components were increased exclude Ca10-P.Long-term application of nitrogen and check treatment,the contents of Al-P,Fe-P,O-P,Ca10-P are decreased.The rations of Fe-P,Al-P,Ca8-P,Ca2-P to soil total P were increased,but O-P and Ca10-P were decreased.The distributions of all forms of inorganic phosphorus were similar,and showed decreased firstly and then increased.Correlation analysis showed: Ca2-P,Ca8-P,Al-P,Fe-P,O-P were significantly correlated with Olsen-P at P≤0.01 level.Ca10-P was correlated with Olsen-P at P≤0.05 level.