Zum Einfluß von Rückständen von Zink‐ und Bleiverbindungen im Wasser auf die Assimilation vonFontinalis antipyretica
作者:
G. Weise,
G. Burger,
S. Fuchs,
L. Schürmann,
期刊:
Acta hydrochimica et hydrobiologica
(WILEY Available online 1985)
卷期:
Volume 13,
issue 1
页码: 25-34
ISSN:0323-4320
年代: 1985
DOI:10.1002/aheh.19850130104
出版商: WILEY‐VCH Verlag GmbH
数据来源: WILEY
摘要:
AbstractThe carbon‐dioxide assimilation ofFontinalis antipyreticais inhibited by 100 mg/1Zn2+or Pb2+, without a lethal effect being caused. With increasing time of exposure from one to six days the threshold value of toxicity is lowered and at the same time the net assimilation is reduced within the range of concentration of 0.1 mg/1. In the ecological optimum of the environmental conditions the toxicity is weaker than under other unfavourable environmental conditions at the same time. Therefore, the photoecologically optimum illumination of 1200 lx is an effective bioprotector against phytotoxic lead ion concentrations, so that at 1200 lx also at a comparatively high load a positive photosynthesis balance can be maintained. In the dark, in the first hour after the application of the lead ions dissimilation is a function of concentration, subsequently the respiration differences decrease very much in the range between 0 and 100 mg/1 lead(II)‐ions. Stimulating effects could be demonstrated only by 0.01 mg/1 Pb2+and only for the carbondioxide assimilat
点击下载:
PDF
(564KB)
返 回