利用根箱法解析大豆苗期氮磷吸收及其在根际分布的特征

应用根箱法对2种不同大豆基因型苗期的氮、磷吸收及其在根际分布进行比较研究.结果表明,高产品种北丰11单位根长及根表面积吸收的氮、磷量及植株体内的氮、磷含量均高于低产品系海9731,北丰11表现出较强的吸收养分能力.土壤有效氮、磷在根际的分布趋势不同,根际有效氮含量高于非根际,而有效磷含量则低于非根际,但全氮和全磷的含量无明显变化.不同基因型间,活化根际养分能力差异较大,北丰11在0-8 mm内的根际土壤有效氮、磷含量均高于海9731,这种差异的原因与2基因型根际pH值的差异有一定关系,北丰11根际pH较低.

INSPECTION OF N AND P UPTAKE, AND ITS DISTRIBUTION ACROSS RHIZOSPHERE AT SEEDLING STAGE OF SOYBEAN BY RHIZOBOX METHOD

Using rhizobox method, the N and P uptake and its distribution across rhizosphere at seedling stage in two soybean cultivar or line were investigated. The results showed that the high yielding soybean cultivar, i.e. Beifeng 11 had higher N and P uptake per root length and per root surface area than that ofthe low yielding soybean line, i.e. Hai 9731, and the N and P content in plant had the same trend, which indicated that Beifeng 11 had a relatively high capability of nutrient absorption. The distribution of N and P across rhizosphere was different. The soluble N in rhizosphere was higher than non-rhizosphere, but a negative trend was found for the soluble P. Total N and P in rhizosphere were same as non-rhizosphere. The capability of nutrient mobilization in rhizosphere of the two genotypes was different. The soluble N and P in 0-8mm of rhizosphere for Beifeng 11 were higher than Hai 9731, which might be related to the difference of pH in rhizosphere. Beifeng 11 had higher pH in rhizosphere.