砂质潮土上不同大豆品种低磷敏感性的差异

采用砂质潮土进行盆栽试验,设置磷充足和缺磷二个水平,研究了33个河南省地方性的大豆品种苗期植株(39d后收获)对低磷敏感性的差异。结果表明:供试大豆品种间在植株相对干物重(RW)、相对磷素积累量(RA)及相对磷利用效率(RE)三项指标上均表现出显著的差异,但相对株高(RH)变异较小,差异未达显著水平。植株相对磷素积累量与植株相对干物重的简单相正系数(r=0.7832**)与偏相关系数(r=0.8641**)均达显著水平,但相对磷素利用效率与植株相对干重的简单相关关系不显著(r=-0.2769),仅偏相关系数达显著水平(r=0.6458**)。利用相对干物重和相对磷素积累量进行的品种聚类分析表明,供试33个品种可分为3种类型:其中RW与RA均高的品种有4个;RW与RA均低的品种15个;中间型品种14个。

Study on the Variation of Sensitivity of Soybean Varieties to Low-P Stress on Sandy Damp-soil

Pot experiment with sandy damp soil under two P levels (high-P and low-P)was conducted to test the variance of sensitivity to low-P stress among 33 soybean varieties. it was indicated that the tested soybean varieties showed significant variation in the index of either relative dry weight (RW), relative P accumulation(RA) or relative P utilization efficiency, but not in the one of relative plant height(PH). Both the simple correlation(r=0.7832**) and the partial correlation(r=0.8641**)of relative P accumulation to relative dry weight and the simple correlation(r=-0.2769) of relative P utilization efficiency to relative dry weight each reached significant level, but for the partial correlation(r=0.6458**) of relative P utilization efficiency to relative dry weight. Dendrogram of soybean varieties by RW and RA showed that 33 varieties could be classified to three classes with the one of both high in RW and RA, the one of both low in RW and in RA and the one of either RW or RA not high involved in 4,15 and 14 varieties respectively.