蜈蚣草中砷与磷-钾-钙等营养元素的交互作用-

蜈蚣草中砷与磷\\钾\\钙等营养元素的交互作用

摘要砷污染对植物、动物和人体均产生毒害作用。研究砷元素与磷、钾、钙等元素的交互作用,结果表明:在蜈蚣草体内磷的浓度会随着培养液中砷浓度的增加而增加,两者并不存在拮抗关系;蜈蚣草羽叶表皮细胞中砷和钾浓度呈显著正相关;蜈蚣草中砷的累积量会同时受介质中砷水平和钙水平的限制。在提高介质中的砷浓度时,蜈蚣草根部的镁浓度逐渐降低,但对叶柄和羽叶中的镁浓度无显著影响。

关键词砷;营养元素;交互作用;蜈蚣草

InteractionBetweenArsenicandPhosphorus,Potassium,CalciumandOtherNutrientElementsinPterisvittataL.

WU FengXIONG Jun-fen *

(College of Resources and Environment,Yunnan Agricultural University,Kunming Yunnan 650201)

AbstractArsenic pollution has poisoning effect on plant,animal and human being.The interaction between arsenic and phosphorus、potassium,calcium and other elements was studied.The results showed that:in Pteris vittata L.,phosphate concentration increased with the increasing of arsenic concentration of culture medium;there was no antagonism relationship between them,but there was significant positive correlation between the phosphate concentration of potassium concentralion in leaf epidermal cells;besides the phosphate accumulation was limited by the level of phosphate and calcium. The magnesium concentration of root decreased with the increaseing of phosphate concentration,but it had no infulence on the magnesium concentration of petiole and leaves.

Key wordsarsenic;nutrient element;interaction;Pteris vittata L.

随着生活水平的提高,人们对环境、健康的要求逐步提高。但是,由于工农业的超载发展、“三废”的违规排放等,使得空气、水体、土壤等环境要素纷纷受到污染。砷(Arsenic,As)是自然界中普遍存在的一种有毒元素,是农药、医药和日用化工等的重要原料。由于人类活动和地质条件的影响,砷中毒事件时有报道,特别是在孟加拉和印度,有将近1亿人生活在砷污染区域[1],大面积的农田土壤因高砷水灌溉遭到污染,粮食作物中砷超标问题严重。我国某些地区的土壤砷污染问题也相当突出,严重影响了人民的生活质量[2],目前,砷污染环境问题已引起国内外