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大型濕地植物對水產養殖廢水中礦質元素和重金屬富集特征分析

時間:2019-06-30 08:04來源:畢業論文
在不同季節采集該基地潛流濕地大型濕地植物美人蕉(Canna indica)、鳶尾(Iris tectorum)、蘆葦(Phragmites australis)和再力花(Thalia dealbata)的地上部分析其生長、礦質營養、重金屬元素

摘要:從濕地中采收不同的水生植物,并進行植物元素分析,分析其富集礦質營養和重金屬的動態過程,探索和鑒定利用水生植物混生種植進行生物修復的可行性。[方法]以淡水養殖試驗基地為試驗地點,在不同季節采集該基地潛流濕地大型濕地植物美人蕉(Canna indica)、鳶尾(Iris tectorum)、蘆葦(Phragmites australis)和再力花(Thalia dealbata)的地上部分析其生長、礦質營養、重金屬元素積累。[結果]寒冬過去后,蘆葦的生長恢復最快,冬去春來其生物量明顯高于其他三種植物,而美人蕉恢復最慢。隨著夏季和秋季的來臨,四種植物均明顯生長,尤其是美人蕉,其次是再力花。四種植物對氮素的富集能力都很強,此外,美人蕉對磷、鉀、鎂、鋅、銅、鈉等的富集能力特別強,而鳶尾對磷、鈣、鎂等富集能力比較強,蘆葦對硫、鐵、鋁、鉻、鎘、鉛等富集能力很強,再力花對硫、錳的富集能力較強。[結論]美人蕉對水產養殖廢水中諸多元素的總積累要明顯強于鳶尾、蘆葦和再力花,其次是蘆葦。在淡水養殖基地,混生的美人蕉、鳶尾、蘆葦和再力花對不同元素富集具有明顯的互補性,混合種植從而進行修復污水是可行的。36751
畢業論文關鍵詞:水產養殖廢水;潛流濕地;濕地植物;礦質元素;重金屬元素;生物富集
Accumulation characteristics of mineral nutrients and heavy metals in aquaculture wastewater by four species
oflarge wetland plants
Abstract: [Objectives]:Harvest different aquatic plants from wetlands, and analyse their element.Accumulation.Then,concentrationdynamic process of mineral nutrients and heavy metals by aquatic plants are analysed to explore and identify the feasibility of using mixed cultivation of aquatic plants for bioremediation. [Methods] The test was carried on at the freshwater aquaculture test site, where four large-scale submerged wetland plants, Canna indica, Iris tectorum, Phragmites australis and Thalia dealbata, were collected in different seasons. Their plant growth condition, concentration and accumulation of mineral nutrition and heavy metal elements of above ground parts were clearly revealed. [Results] Compared with other three plants, P. australis had better growth recovery, and its biomass was obviously higher than that of other three plants in spring comes after winter. Except for P. australis, there is little difference between I. tectorum and T. dealbata in the biomass, and growth recovery of C. indica is bottom. With the coming of summer and autumn, four of them grow quickly, especially the C. indica and then the T. dealbata. C. indica, I. tectorum, P. australis and T. dealbata, all of them, had a very strong ability to absorb the nitrogen (N). Moreover, C. indica had the strongest adsorption capacity to Phosphorus (P), Potassium (K), magnesium (Mg), zinc (Zn), copper (Cu), sodium (Na), etc. I. tectorum had a stronger adsorption capacity to P, calcium (Ca) and Mg, etc. P. australis had a strong adsorption capacity to sulfur (S), Iron (Fe), aluminum (Al), chromium (Cr), cadmium (Cd), lead (Pb), etc. T. dealbata had a strong adsorption capacity to S and Mg. [Conclusions] C. indica had a better capacity to absorb the accumulated chemical elements in cultured wastewater than that of I. tectorum, P. australis and T. dealbata. In this kind of freshwater aquaculture base, C. indica, I. tectorum, P. australis and T. dealbata had a complementary capacity of concentrating different kinds of chemical elements, which demonstrates that mixed planting to remediate the sewage is feasible.
源¥自%六^^維*論-文+網=www.aftnzs.live

Key words: Aquaculture wastewater; Subsurface constructed wetland; Wetland plant; Mineral element; Heavy metal element; Biological concentration
目錄
摘要:    1
關鍵詞:    1
Abstract: [Objectives]:    1
Key words:    2 大型濕地植物對水產養殖廢水中礦質元素和重金屬富集特征分析:http://www.aftnzs.live/shengwu/20190630/35322.html
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