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The Ecological Adaptation and Interference of Four Submerged Plants Influence of Spirogyra Communis and Cladophora Oligoclona

Author: MaQing
Tutor: MaJianMin
School: Henan Normal
Course: Ecology
Keywords: filamentousalgae Spirogyra communis Cladophora oligoclona submerged plant interference allelopathy
CLC: X524
Type: Master's thesis
Year: 2011
Downloads: 14
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Abstract


Lakes and water eutrophication have begin to emerge in China, causing great influence to the development of our country’s economy. Recent decades, people have used many methods to solve this problem, research shows that reconstruction and restoring the submerged plant mainly water ecological system and maintaining its benign cycle is governance eutrophication optimization approach.In the implementation of the "eleventh five-year plan" major technology special relevant restore the west region of hangzhou xihu lake of the process of aquatic vegetation, found that the lake district of extremely easily include filamentousalgae,e.g. Spirogyra communis, Hydrodictyon reticulatum,Cladophora oligoclona, the existence of including filamentous algae breeding in physical winding,nutrition competition, shading and aspects of allelopathy influence the growth of higher plants.Therefore,we studied the ecological adaptability of filamentousalgae,Spirogyra communis and Cladophora oligoclona and these two filamentousalgae on higher interference of submerged plant Potamogeton crispu,Elodea nuttallii, Myriophyllum verticillatum,and Ceratophyllum demersum, providing theory basis for the west lake aquatic vegetation restoration and management.Experiment from three environmental factor,temperature,light intensity and nitrogen phosphorus concentration perspective research on the ecological adaptability of Spirogyra communis and Cladophora oligoclona and found spirogyra optimal growth for 20℃,the temperature around the optimal light strong 3000Lux, spirogyra in nitrogen and phosphorus concentration in large scope for growth, in nitrogen 3mg/L, phosphorus concentration of 0.3 mg/L condition grew more good. Cladophora oligoclona Kuetzing the optimum temperature for about 25℃,the optimal light intensity, around 5000Lux high concentrations of nitrogen to bristle algae phosphorus has the strong tolerability,even in heavy eutrophication conditions still maintain a certain amount of growth. Compared with spirogyra,bristles algae has stronger ecological adaptability.Through the contact of cultivating and not contact of cultivating two systematic study of the Spirogyra communis and Cladophora oligoclona Kuetzing for four interference submerged plant influence. The results found that Spirogyra communis and Cladophora oligoclona Kuetzing will influence by submerged plant chlorophyll content,antioxidant enzymes activity,relative growth, etc. When the mass ratio filamentousalgae and submerged plant of 3:1, filamentousalgae can put almost completely submerged plant roots, with the amount of filamentousalgae increase the influence of the submerged plant is bigger also. Spirogyra communis with water algae submerged plant biooxyrate plants suffer from Spirogyra communis and Cladophora oligoclona. The effects of integrated circumstance sorting are. Myriophyllum verticillatum > Ceratophyllum demersum > Potamogeton crispu > Elodea nuttallii; Four submerged plant Spirogyra communis and Cladophora oligoclona by water of allelopathy effects of integrated circumstance sort are respectively: Ceratophyllum demersum > Myriophyllum verticillatum > Elodea nuttallii > Potamogeton crispu, Myriophyllum verticillatum > Ceratophyllum demersum > Potamogeton crispu > Elodea nuttallii.Taken together,exotic species Elodea nuttallii and Potamogeton crispu have strong competitiveness on filamentousalgae,can include filamentous algae more in the waters of the eutrophication of ecological restoration vanguard,but we should consider the harm ecosystem invasion of Elodea nuttallii. Ceratophyllum demersum and Myriophyllum verticillatum have bigger influence by spirogyra algae of allelopathy, can be aquatic vegetation restoration whether Spirogyra communis, Cladophora oligoclona mere existence or does not.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control > Lakes and reservoirs
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