Ding Long-jun, Xiao He-ai, Wu Jin-shui, Ge Ti-da
Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changcha 410125, China.
Ying Yong Sheng Tai Xue Bao. 2010 Jul;21(7):1759-65.
In order to further understand the mechanisms of microbial immobilization of phosphorous (P) in highly weathered red soil with organic amendment, an incubation test was conducted to investigate the roles of microbial functional groups in the transformation of P in 0.2-2 mm soil aggregates. Throughout the 90-day incubation period, amendment with rice straw induced a substantial increase in the amounts of microbial biomass C and P, Olsen-P, and organic P in the aggregates. Comparing with rice straw amendment alone, the amendment with rice straw plus fungal inhibitor actidione decreased the amount of microbial biomass C in the aggregates by 10.5%-31.8% in the first 30 days. Such a decrement was significantly larger than that (6.8%-11.6%) in the treatment amended with rice straw plus bacterial inhibitors tetracycline and streptomycin sulphate (P<0.01). After the first 30 days, the microbial biomass C remained constant. In the first 20 days, the amount of microbial biomass P in the aggregates was 10.0%-28.8% higher in the treatment amended with bacterial inhibitors than in the treatment amended with fungal inhibitor (P<0.01). All the results suggested that that both the fungal and the bacterial groups were involved in the microbial immobilization of P in the soil aggregates, and the fungal group played a relatively larger role.
为了进一步了解有机物料改良对高度风化红壤中微生物固定磷（P）机制的影响，进行了一项培养试验，以研究微生物功能群在0.2 - 2毫米土壤团聚体中磷转化过程中的作用。在整个90天的培养期内，添加稻草显著增加了团聚体中微生物生物量碳和磷、 Olsen - P以及有机磷的含量。与单独添加稻草相比，添加稻草和真菌抑制剂放线菌酮在前30天使团聚体中微生物生物量碳的含量降低了10.5% - 31.8%。这种降低幅度显著大于添加稻草和细菌抑制剂四环素及硫酸链霉素处理中的降低幅度（6.8% - 11.6%）（P < 0.01）。30天后，微生物生物量碳保持稳定。在前20天，添加细菌抑制剂处理的团聚体中微生物生物量磷的含量比添加真菌抑制剂处理的高10.0% - 28.8%（P < 0.01）。所有结果表明，真菌和细菌群体都参与了土壤团聚体中磷的微生物固定过程，且真菌群体发挥的作用相对更大。
