长期施肥条件下栗褐土碱性磷酸酶活性及其与磷形态的关系

利用长期定位试验研究了长期不同施肥对土壤碱性磷酸酶活性的影响及碱性磷酸酶与土壤磷素形态间的相关关系.结果表明:与不施肥的对照处理相比,长期施肥特别是有机肥与化肥配施可以显著提高土壤碱性磷酸酶活性;碱性磷酸酶活性与土壤速效磷、有机磷总量、中活性有机磷、中稳性有机磷、Ca2-P和Ca8-P含量相关性均达到极显著水平(P＜0.01),与A1-P、Fe-P和O-P相关性达显著水平(P＜0.05);各形态磷对碱性磷酸酶活性直接影响的大小顺序为Ca8-P(-5.706 9)＞Fe-P(4.180 5)＞Ca2-P(2.760 4)＞Ca10-P(0.980 0)＞中稳性有机磷(0.892 4)＞Al-P(-0.567 5)＞O-P(-0.294 4)＞活性有机磷(0.268 1)＞中活性有机磷(0.210 3)＞高稳性有机磷(-0.165 2).

Effects of Long-term Fertilization on Relationship Among Phosphorus Forms in Loess Hilly-gully Region

Effects of long-term fertilization on the relationship of alkaline phosphatase activity (APA) with phosphorus forms in loess hilly-gully region were studied by long-term fertilization experiment from 1988 to 2011. The results showed that compared with CK, the long-term fertilization of organic manure and chemical fertilizer could significantly increase APA. The correlations of APA were extremely significant with the content of Olsen-P, total organic phosphorus (T-OP), moderately labile organic phosphorus (ML-OP), moderately resistant organic phosphorus (MR-OP), Ca2-P and Ca8-P. The order of direct-effect of different phosphorous forms on APA was Ca8-P (-5.706 9) >Fe-P (4.180 5) >Ca2-P (2.760 4) >Ca10-P (0.980 0) >MR-OP (0.892 4) > Al-P (-0.567 5) >O-P (-0.294 4) >L-OP (labile organic phosphorus) (0.268 1) >ML-OP (0.210 3) >HR-OP (high resistant organic phosphorus) (-0.165 2).