菜茶果园红壤微生物量磷与土壤磷以及磷植物有效性之间的关系研究

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。%8 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.