三年生三七生长、光合特征及砷含量对土壤砷胁迫的响应

来源 :云南农业大学学报(自然科学) | 被引量 : 0次 | 上传用户:nihaosww
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为了了解三年生三七对土壤砷污染的响应特征和机理。通过大田种植和室内分析的方法研究三年生三七在不同质量分数砷处理下的生长状况(形态指标、生物量、光合特征、光合色素)以及三七各部分(茎叶、剪口、主根、须根)砷含量,探讨砷处理对三年生三七生长、光合特征及砷积累的影响。结果表明:(1)高质量分数的砷处理(砷质量分数≥140mg/kg)对三七形态指标、生物量有显著的抑制作用,但低质量分数的砷处理(≤80mg/kg)对三七生长无显著影响。(2)高质量分数砷处理显著降低了叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导
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