低磷条件下不同基因型小麦幼苗对磷的吸收和利用效率及水分的影响

 选用在土壤磷水平为5～7mgP·kg-1土的条件下筛选出来的不同磷效率的4个冬小麦品种，采用盆栽试验研究了有效磷为3．2mgP·kg-1土时的磷效率、磷吸收效率、磷利用效率及土壤水分对这些指标的影响。结果表明：在有效磷很低的土壤上，“磷高效”品种小偃54和81(85)5—3—3—3在幼苗期并未表现出较高的磷效率。尽管这两个品种的磷吸收效率显著地高于NC37和京411，但由于它们的磷利用效率相对低于京411，从而使磷效率并未显著地提高。土壤水分对4个品种的磷吸收效率和利用效率均有显著影响。

Phosphorus Uptake and Utilization Efficiency in Seedlings of Different Wheat Genotypes as Influenced by Water Supply at Low Soil Phosphorus Availability

A 3 factorial pot experiment, with 2 phosphorus levels, 3 soil water contents and 4 winter wheat cultivars was designed to compare the P efficiency, P uptake efficiency and P use efficiency of different cultivars at Olsen-P 3.2 mg ·kg-1 of soil, and as influenced by soil water content. The results indicated that two cultivars, Xiaoyan54 and 81 (85), had high P-efficiency in Olsen-P 5～7 mg·kg-1 soil and did not show higher P efficiency (relative biomass of -P/+P condition) in lower available P soil at the seedling stage. Although P uptake efficiency in these two wheat cultivars were significantly higher than those in cultivars NC37 and Jing411, there was relatively lower P use efficiency in the Xiaoyan54 and 81(85) than that in Jing411. Therefore, no significant difference was observed among the four wheat cultivars. Soil water content had a substantial impact on P uptake and P use efficiency in all 4 cultivars.