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Effect of eutrophication on allelopathic inhibition of algae bloom by Alternanthera philoxeroides based on the microcosm method

Effect of eutrophication on allelopathic inhibition of algae...

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中国第五届植物化感作用学术研讨会

作者： Zuo Sheng-peng ,Ye Liang-tao,Hui Mei,Mei Li College of Environmental Sciences and Engineering,Anhui Normal University,Wuhu 241003

Based on the theory of microcosm,the toxic effects of alligator weed (Alternanthera philoxeroides (Mart.) Griseb.) on Microcystis aeruginosa and Chlorella pyrenoidosa was conducted under artificial control of ***,we presumed that the inhibition of water bloom would possibly result from allelochemicals exuded or excreted by alligator *** displayed a decreased order of allelopathic inhibition to harmful algae as: co-culturing,water extracts of plants,and filtrate from culturing water,whose mean suppression rate was 0.86,0.72,and 0.45,*** both algae were cultured in water circumstances added by water extracts of alligator weed plants,their inhibition depended on nutritional *** in oligotrophic circumstance will be inhibited by *** more strongly than those in normal (mesotrophic status),and eutrophic ***,nutrient status will also affect allelopathic potential of filtrate of cultured medium of living plants of alligator *** inhibition of living plants exudates exhibited a trend as the nutrient state like oligo-trophication >eutro-phication>*** *** and harmful algae co-cultured in the aquarium,alligator weed will inhibit water bloom,which correlated with nutrient *** algae suppression showed a highest level in eutrophication,and middle in oligo-trophication,and the weakest in *** HPLC,2-hydroxy-1-methoxyl-anthraqui-none,stigmastane-22-ene-3,6-dione,stigmasterol-3-O-β-D-glucopyranoside was confirmed as the main allelochemicals in alligator *** content varied with habitat nutrient such as oligo-trophication >eutro-phication>*** equations and models were built up to study the relationship among allelochemicals,nutrient state,and inhibition rate of water bloom,which help to select the optimum condition of harmful *** the present research,it concluded that *** owned allelopathic pote

关键词： Microcosm Alternanthera philoxeroides (Mart.) Griseb. waterbloom algae nutrient press allelopathic potential

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