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,由于在高營養及低密度條件下典型沉水穗花狐尾藻(穗花狐尾藻,小二仙草科狐尾藻屬植物,沉水草本,為歐亞大陸廣布種)的相對生長速率要明顯高于低營養及高密度環境。這也就意味著,狐尾藻在高營養及低密度環境下可以迅速擴張,這對于沉水植物種群擴張的調控作用,及濕地植被生態恢復都有積極的促進作用。[3]狐尾藻真的能致富?...
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