关键词: 氨基酸, 氨基酸, 根系活力, 土壤酶, 微生物生物量

Abstract: In order to study phosphorus forms and availability of Hunan tobacco-planting soil and illustrate the relationship among soil phosphorus forms, transportation and effectiveness, 16 representative soil samples of 4 main parent materials from Hunan tobacco-growing area were analyzed. The results showed that inorganic P was the main form of different parent materials planting tobacco soil phosphorus, which accounted for 63.82%-77.77% of total P, organic P only accounted for 22.23%-36.18%. The content of total P was relatively high in plate shale and purple slate of 834.63-991.86 mg/kg, but the available P content was low of 29.53-30.02 mg/kg; the contents of total P and inorganic P were low, but the content of available P and its proportion in total P in quaternary red clay and limestone were high. The order of the content of inorganic P, organic P and available P in different parent materials was: quaternary red clay＞limestone＞plate shale and purple slate. Soil available P had no direct correlation with total P, organic P and inorganic P in different parent material tobacco-planting soils.