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中文摘要：
对黑土（简育湿润均腐土）长期定位施肥15年后土壤磷素形态进行分析研究。结果表明：土壤中积累的Al-P、Ca2-P量与施磷量成正相关；只施NK能促进植物对Ca8-P的吸收；闭蓄态磷（Oc-P）含量均较低。施磷肥能增加黑土Fe-P含量，却未能增加Ca10-P含量。黑土各形态无机磷的含量大小顺序为：Fe-P〉Ca10-P〉Al-P〉Cas-P〉Ca2-P〉Oc-P。施磷能增加土壤中有机磷（O-P）的含量，但不能增加土壤有机质含量。土壤有机质含量均有不同程度的下降。本试验黑土中施入N112．5kg hm^-2a^-1和P20kg hm^-2a^-1能保持土壤中无机磷（I-P）平衡。
英文摘要：
Change in forms of phosphorus in a typical Hapli-Udic Isohumosols （black soil） under a 15-year long-term fertilization experiment was studied. Results show that accumulation of soil Al-P and Ca2-P was positively related to P application rate; application of NK stimulated the plant to absorb Cas-P; and the concentration of Occluded-P（Oc-P） was decreased. P application did increase the content of Fe-P in the black soil, but did not the content of Ca10-P. In terms of content in the black soil, the various forms of in-organic P were in the order of Fe-P〉 Ca10-P〉 Al-P〉 Cas-P〉 Ca2-P〉 O-P. P fertilizer application increased organic P in the soil, but it did not increase the content of organic matter. Instead, the content of organic matter dropped to a varying degree in different treatments. Application of N 112.5 kg hm^-2 a^-1 and P 20 kg hm^-2 a^-1 could keep I-P in balance in the soil.
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