高铝低磷胁迫对胡枝子生长及矿质元素吸收的影响

限制酸性土壤作物生长的最重要、最普遍的因子是Al3+ 的毒害和 P 的缺乏.本文用溶液培养试验研究两种不同生态型的二色胡枝子在高Al低P胁迫下的矿质营养元素积累情况.试验表明,江西胡枝子比河北胡枝子更耐低 P 低 pH 的生长环境,但两者间耐Al性无显著差异;100 μm/L Al 处理显著地抑制了两种胡枝子对 Ca 的吸收,降低了根系 Mg 的积累量,对植株的 K、P、Fe、Zn、Cu 含量没有显著影响;低 P 处理没有显著降低两种胡枝子对 Ca、K、Fe、Zn、Cu 和江西胡枝子对 Mg 的吸收,但是低 P 处理显著降低了河北胡枝子对 Mg 的吸收和转运.二色胡枝子植株吸收的 Al 主要积累在根部,地上部分Al含量仅是根系的1% 左右.

Mineral nutrition and growth of Lespedeza bicolor under high Al and low phosphorus stress

Aluminum toxicity and phosphorus deficiency are the most important limit factors for crop growth in acid soils in many regions of the world, the problem is particularly severe when pH is below 5.0. Lespedeza bicolor is a forage legume, well adapted to acid infertile soils. This paper investigated mineral nutrition of Lespedeza bicolor under high Al and low phosphorus stress. The results showed that Al stress significantly reduced Ca content in the shoots and roots and Mg accumulation in the roots; but had no effect on the contents of K, P, Fe, Zn and Cu of two Lespedeza cultivars. Low phosphorus treatment significantly reduced the absorption and transport of Mg in the roots of Hebei Lespedeza cultivars, but had no effect on the contents of K, P, Fe, Zn and Cu of two Lespedeza cultivars. Al accumulated mainly in the roots of Lespedeza bicolor, which indicated Al tolerance of Lespedeza bicolor was achieved by restricting Al absorption from the soils and Al upward transportation of in the plants.