5.1 Protection of aquatic areas is currently being emphasized by several agencies including the U.S. Environmental Protection Agency and Environment Canada. For pesticide registration, these agencies are beginning to require data regarding the toxicity of test chemicals to aquatic rooted vascular plants (25-28).
5.2 Toxicological research with terrestrial and aquatic vascular plants has been initiated (29) including the development of a protocol for testing with emergent macrophytes (Guide E1841) (30). However, protocols for phytotoxicity testing with freshwater submersed plants still require development. Toxicological research has been conducted using submersed macrophytes (1-8, 31-35) but standardization of the methods is required.
5.3 This guide is designed to assess the phytotoxic effects of chemicals upon a selected freshwater species of submersed aquatic macrophyte, Myriophyllum sibiricum Komarov. This species is an ecologically important submersed aquatic dicotyledon with a north temperate distribution. It is readily cultured in test tubes in the laboratory (36). Lower temperatures in autumn initiate the formation of turions on lateral branches that develop into new plants when environmental conditions become favorable (19-23). Toxicological testing with this species has demonstrated that it is an ideal species for labor......
此外,由于在高营养及低密度条件下典型沉水穗花狐尾藻(穗花狐尾藻,小二仙草科狐尾藻属植物,沉水草本,为欧亚大陆广布种)的相对生长速率要明显高于低营养及高密度环境。这也就意味着,狐尾藻在高营养及低密度环境下可以迅速扩张,这对于沉水植物种群扩张的调控作用,及湿地植被生态恢复都有积极的促进作用。[3]狐尾藻真的能致富?...
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