摘要
采用室内恒温培养法研究了秸秆配施氮、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比有关，但前期（１～２个月）都能提高土壤速效磷水平．
Indoor thermostatic culture was used to study the effects of different straws applied with N,P on available N and P contents of chao soils . The results indicated that the content of available N increased significantly after straws were applied to soils 2-3 months . With application of straws solely or together 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. Peanut straw, however, could significantly increase available N content through its mineralization .The different effects of three kinds of straw's mineralization on available P content were related to their C/P ratio. Nevertheless, all given straws could increase available P at early stage (1-2 months) .
基金
浙江省自然科学基金
关键词
秸秆
矿化
碱解氨
速效磷
潮土
氮肥
磷肥
straw
mineralization
available N
available P
chao soil
