Comparative patterns of sodium accumulation in leaves of selected savanna species growing on sodic and nonsodic soils

C. Bailey, M. Scholes
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引用次数: 9

Abstract

Plants show differing mechanisms of tolerance to high sodium levels in soils. Physiological and biochemical mechanisms have been investigated for many crop species but little information is available for indigenous tree and grass species. Foliar concentrations of sodium, calcium, potassium, magnesium and nitrogen were measured in selected savanna species growing on and off sodic soils. Sodic soils are those defined as having a high exchangeable sodium percentage or a high sodium adsorption ratio. Sodium concentrations of up to 6% were measured in the leaf tissue of species found growing solely on sodic sites. Species that grow both on and off sodic sites did not show significantly different levels of foliar nutrients although the levels of exchangeable soil cations were quite different on the two sites. The data suggest that plants which grow specifically on sodic soils have inclusion mechanisms which allow for high levels of sodium in the leaf tissue which do not disrupt physiological functioning whereas...
在碱土和非碱土上生长的热带稀树草原物种叶片中钠积累的比较模式
植物对土壤中高钠含量表现出不同的耐受机制。许多作物物种的生理生化机制已被研究,但对本地树种和禾本科植物的生理生化机制知之甚少。测定了生长在盐碱地和非盐碱地上的热带稀树草原植物叶片中钠、钙、钾、镁和氮的浓度。钠质土壤被定义为具有高交换钠百分比或高钠吸附比的土壤。钠浓度高达6%的物种的叶片组织中发现仅生长在钠的位置。在盐碱地上和盐碱地外生长的树种,其叶面养分水平没有显著差异,但土壤阳离子交换性在盐碱地和盐碱地上差异较大。数据表明,在钠质土壤上生长的植物具有包涵机制,允许叶片组织中含有高水平的钠,而不破坏生理功能,而……
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