在美国东南部越冬豆科作物作为覆盖作物日益普遍。覆盖作物对水土保持是必需的,同时,越冬豆科作物能产生有效氮供给夏收作物。由于减少了对氮肥的需要,越冬豆科作物作为覆盖作物对农业生态系统中能量储备、经济效益以及土壤保持都产生影响。虽然越冬豆科作物的氮动力学研究已非常彻底,但越冬豆科作物在其它养分循环方而的作用几乎没有研究。众所周知,氮肥的形态对植物获得阳离子和磷的影响,但很少 Winter legume crops in the southeastern United States are increasingly common as cover crops. Covering crops for soil and water conservation is necessary, while overwintering leguminous crops can produce effective nitrogen supply summer harvest crops. As a result of the reduced need for nitrogen fertilizer, overwintering leguminous crops as cover crops have an impact on energy reserves, economic benefits and soil conservation in agro-ecosystems. Although nitrogen dynamics in overwintered leguminous crops have been thoroughly studied, there is little research into the role of overwintering leguminous crops in other nutrient cycling. It is well known that the form of nitrogen fertilizers has little, if any, positive effects on plants and phosphorus