秸秆单施或配施氮、磷化肥对潮土供应氮磷特性的影响

Effects of Straws Applied with N,P Fertilizer on Available N and P Contents in Chao Soil

采用室内恒温培养法研究了秸秆单施或配施氮、磷肥对潮土供氮磷特性的影响。结果表明：秸秆施入土壤２～３个月后，土壤碱解氮有明显提高。秸秆单施或与磷肥配施，矿化过程表现为前期净固持，后期净矿化。配施氮肥，麦秸和玉米秸前期矿化氮释放量很少，而花生秸矿化可明显提高土壤碱解氮水平。不同秸秆矿化对土壤速效磷影响不同，这与其Ｃ／Ｐ有关，但前期（１～２个月）都能提高土壤速效磷水平。

The method of indoor thermostatic culture was used to study the effects of different straws applied with N,P fertilizer on available N and P contents in chao soil. The results are as follows:the content of available N was increased significantly after straws were applied to soils 2～3 months. Only applying straws or applied with P fertilizer,the straws' mineralization was net fixation at early stage and net mineralization at later stage. When applied with N fertilizer,wheat straw and maize straw were hardly mineralized to available N. However,peanut straw could significantly increase available N content through its mineralization.The effects were different of three kinds of straw's mineralization on available P content,which was related to their C/P. But all the given straws could increase available P at early stage(1～2 months).