磷高效基因型小麦对缺磷胁迫的根际适应性反应

采用奶箱分隔栽培试验法，进行了磷高效与磷低效小麦基因型根际土壤ＰＨ与有效磷变化的研究，结果表明：小麦根际土壤ＰＨ和有效磷含量皆明显低于外围土壤，表现出明显的根际效应特征；磷高效基因型小麦的根际ＰＨ和有效磷含量明显低于磷低效基因型，ＰＨ变异范围和磷素亏缺区也表现明显较大。为了进一步验证磷高效小麦基因型这的这一根际特征，同时进行了施用水溶性，枸溶性磷肥的试验研究，结果表明，以水溶性磷肥对根际ＰＨ和有效

Adapted responses in the rhizosphere of P efficient wheat genotype to stress of phosphorus deficiency

With a newly developed rhizobox system,studies on changes of pH and available phosphorus (P) in the rhizophere of P efficient wheat genotype were carried out.The results indicated that pH value and available P in the rhizosphere were much lower than that in the bulk soil.pH values and contents of available P for efficient genotype were much lower than that for inefficient one.The similar results appeared as above when P fertilizers supplied but water soluble phosphate had more impact on pH values and available P in the rhizosphere than citvate soluble phosphate.This has been proved that P efficient genotype of wheat possess some special mechanism to utilize soil unavailable P or citrate soluble phosphate in calcareous soil efficiently through some changes of rhizosphere effect.Simultaneously,it has been demonstrated that pH reduction in the rhizosphere is one of the root induced mechanisms of P efficient wheat genotype for the stress of P deficiency,which results in mobilization and efficiently uptake of P from calcareous soil.