【摘要】 对有机质水平差异较大的7种菜茶果园红壤和1种红壤性水稻土进行了微生物量P与土壤P以及P植物有效性之间的相关性研究。结果表明，红壤微生物量P与土壤全P、土壤有机P以及土壤速效P之间存在明显正相关，相关系数分别为0.840， 0.897和0.944。红壤微生物量P尤以与土壤速效P关系最为密切，红壤微生物量P有可能作为红壤供P能力的一个活指标；盆栽试验表明，微生物量C与黑麦草产量呈显著正相关，与黑麦草吸P量以及单位黑麦草吸P量相关性不明显；而微生物量P与黑麦草产量、黑麦草吸P量以及单位黑麦草吸P量之间均呈显著正相关，相关性依次增强；红壤微生物量P在指示土壤植物有效P上的作用不仅体现在植物的产量和植物吸P量上， 更体现在植物的品质～单位重量植物的吸P量上。更多还原

【Abstract】 red soils differing in fertility levels were tested to study the relationships between soil microbial biomass P and soil P or P plant-availability. The results showed that red soil microbial biomass P was closely related with soil total P, soil organic P and soil rapidly available P. Relative coefficients were 0.840, 0.897 and 0.944, respectively. Especially, the significant relation of red soil microbial biomass P to soil rapidly available P suggested that red soil microbial biomass P may act as an indicator of P-supply ability. Greenhouse incubation expriments showed that red soil microbial biomass P was also closely related with ryegrass dry matter yield, ryegrass P uptake and P uptake per unit weight of ryegrass. Relative coefficients were 0.789, 0.895 and 0.910, respectively, which indicated that P plant-availability of red soil microbial biomass P was not only reflected on ryegrass dry matter and plant P uptake,but also more obviously reflected on P uptake per unit weight of plant.更多还原