摘要
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;100μm/LAl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。
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.
出处
《土壤》
CAS
CSCD
北大核心
2009年第4期562-565,共4页
Soils
基金
国家自然科学基金项目(30571114)资助
关键词
二色胡枝子
铝胁迫
低磷胁迫
矿质元素吸收
Lespedeza bicolor, Al stress, Low phosphorus stress, Mineral nutrition
