This experiment was carried out to elucidate the effect of residue C/nutrient ratio on P pools and N availability in wheat rhizosphere. The microcosms included an upper and a lower PVC core with one end of both cores covered by nylon mesh. Wheat was planted in the upper core. To the lower core, crop residues were added as a thin uniform layer on the top mesh. Treatments were control without residue or wheat growth, wheat growth without crop residue, barley straw without or with wheat growth, and barley faba bean residue without or with wheat growth. Sampling was carried out after 14 and 28 days in wheat rhizosphere alone, detritusphere of faba bean residue and barley straw, and in the rhizosphere/detritusphere interface. Mass loss of low C/P faba bean residue was greater than of high C/P barley straw; and mass loss was greater in the detritusphere alone than in the rhizosphere/detritusphere interface. Plant P concentration and P uptake were higher with faba bean residue than with straw and unamended wheat plants. With faba bean, most P pools and N availability, but not microbial biomass N and P, were lower in the rhizosphere/detritusphere interface than detritusphere alone. P pools were higher in detritusphere of faba bean residue than wheat rhizosphere alone. With straw, P pools and MBN were low and not affected by wheat roots. P pools and N availability in the wheat rhizosphere/detritusphere interface were influenced by residue type, and plant nutrient uptake reduced P pools and available N only with low carbon/nutrient faba bean residue.

进行该实验以阐明残留碳/养分比对小麦根际磷库和氮素有效性的影响。缩影包括一个上下PVC芯，两个芯的一端被尼龙网覆盖。小麦种植在上部核心。将农作物残留物作为均匀的薄层添加到下部核心，并置于顶部网格上。处理的控制为无残渣或无小麦生长，无农残的小麦生长，无或有小麦生长的大麦秸秆，无或有小麦生长的大麦蚕豆残余物。在第14天和第28天后分别在小麦根际，蚕豆渣和大麦秸秆的碎屑层以及在根际/碎屑层的界面中进行采样。低C / P蚕豆残渣的质量损失大于高C / P大麦秸秆的质量损失；单独的碎屑层比根际/碎屑层界面的质量损失更大。蚕豆残渣的植物磷含量和磷吸收量高于秸秆和未改良的小麦植物。使用蚕豆时，根际/碎屑层界面中的大多数磷库和氮素利用率较低，但微生物生物量氮和磷却不如单独的碎屑层低。蚕豆残渣中的P库高于单独的小麦根际。使用稻草时，磷库和MBN较低，不受小麦根系的影响。小麦根际/碎屑层界面的磷库和氮有效性受残渣类型的影响，而植物养分的吸收减少了磷库和仅低碳/养分的蚕豆残渣时可获得的氮。蚕豆残渣的植物磷含量和磷吸收量高于秸秆和未改良的小麦植物。使用蚕豆时，根际/碎屑层界面中的大多数磷库和氮素利用率较低，但微生物生物量氮和磷不低于单独的碎屑层。蚕豆残渣中的P库高于单独的小麦根际。使用稻草时，磷库和MBN较低，不受小麦根系的影响。小麦根际/碎屑层界面的磷库和氮有效性受残渣类型的影响，而植物养分的吸收减少了磷库和仅低碳/养分的蚕豆残渣时可获得的氮。蚕豆残渣的植物磷含量和磷吸收量高于秸秆和未改良的小麦植物。使用蚕豆时，根际/碎屑层界面中的大多数磷库和氮素利用率较低，但微生物生物量氮和磷不低于单独的碎屑层。蚕豆残渣中的P库高于单独的小麦根际。使用稻草时，磷库和MBN较低，不受小麦根系的影响。小麦根际/碎屑层界面的磷库和氮有效性受残渣类型的影响，而植物养分的吸收减少了磷库和仅低碳/养分的蚕豆残渣时可获得的氮。在根际/碎屑层界面的含量低于单独的碎屑层。蚕豆残渣中的P库高于单独的小麦根际。使用稻草时，P池和MBN较低，不受小麦根系的影响。小麦根际/碎屑层界面的磷库和氮有效性受残渣类型的影响，而植物养分的吸收减少了磷库和仅低碳/养分的蚕豆残渣时可获得的氮。在根际/碎屑层界面的含量低于单独的碎屑层。蚕豆残渣中的P库高于单独的小麦根际。使用稻草时，磷库和MBN较低，不受小麦根系的影响。小麦根际/碎屑层界面的磷库和氮有效性受残渣类型的影响，而植物养分的吸收减少了磷库和仅低碳/养分的蚕豆残渣时可获得的氮。