外源铁输入下曝气对小兴凯湖狭叶甜茅湿地碳、磷元素的影响

发布时间：2018-01-04 13:04

本文关键词：外源铁输入下曝气对小兴凯湖狭叶甜茅湿地碳、磷元素的影响　出处：《中国科学院大学(中国科学院东北地理与农业生态研究所)》2017年硕士论文　论文类型：学位论文

【摘要】：外源铁输入不仅影响湿地水体中磷去除,还影响湿地土壤元素形态转化以及植物不同器官中元素的累积。本文旨在研究外源铁输入下曝气对小兴凯湖湿地狭叶甜茅湿地磷、碳元素的影响。为了清晰外源铁输入下曝气对湿地元素的影响,本文通过室内模拟实验和沉积芯培养实验,研究不同铁输入强度和曝气处理下,外界环境变化规律、水体中磷去除效果以及湿地元素在不同分室(水、土和植物)中的累积和分配特征。最后,本文还对比分析两种不同培养方式下水体中磷去除率、湿地植物碳累积以及土壤铁形态转化,有助于深入理解湿地生态系统物质循环过程,为湿地保护和恢复提供理论依据。主要结论如下:1、曝气处理下,三种不同的铁磷浓度比一定程度上可以降低水体磷浓度。在铁磷比为5时,水体中TP去除率随着时间缓慢升高并趋于平稳;铁磷比为6/10时,水体中TP去除率呈大幅波动式变化。2、外源铁输入影响到植物不同器官中元素累积浓度出现差异,其规律表现为Fe:根茎叶,P:茎叶根,TOC:茎叶根。狭叶甜茅对铁耐受限度为10 mg/L。3、湿地土壤中有机磷和无机磷各占50%。其中,各形态无机磷比例差异较大,以铁结合态磷为主,占无机磷的45%。小兴凯湖具有很高的内源磷负荷,与小兴凯湖水体严重富营养化和藻类爆发关系密切。4、铁磷比为5时,无定形铁、铁活度(无定形铁/游离铁)与有机碳存在显著显著的相关性(p0.05),而铁磷比为10时铁活度与有机碳并不存在相关性。因此,加大有机碳的投入即增加有机质含量,有利于土壤无定形铁含量增加,但并不一定会增强土壤氧化铁活度。5、从湿地稳定性出发,为了维持小兴凯湖狭叶甜茅的正常生长,应当控制水体中铁浓度不超过10 mg/L,使铁浓度控制在狭叶甜茅的耐受范围之内。并在狭叶甜茅耐受限度之内,投放小于等于5 mg/L铁量,达到控制水体磷浓度的效果,从而净化水质,恢复受污染的水体。
[Abstract]:Exogenous iron input not only affect the phosphorus removal of wetland water, also the cumulative effect of wetland soil and plant morphological transformation elements in different organs of elements. This paper aims to study the exogenous iron input under aeration on small Xingkai Lake Wetland glyceria spiculosa wetland phosphorus, carbon impact. In order to clear the exogenous input of iron under the influence of aeration on wetland elements in this paper, a laboratory experiment simulation and sedimentary core of different iron input intensity and aeration treatment, changes of the external environment, and the removal efficiency of wetland elements in different sub chamber of phosphorus in water (water, soil and plants) in the accumulation and distribution characteristics. Finally, this paper also analyzed two different training methods under the phosphorus removal rate of wetland plants and soil carbon accumulation in iron speciation, contribute to further understanding of wetland ecosystem material circulation process, provide the theory for wetland protection and restoration On the basis of. The main conclusions are as follows: 1, aeration treatment under three different concentration ratio of iron phosphorus decreased. The phosphorus concentration in the iron phosphate ratio is 5, the water removal rate of TP increased slowly with time and tends to be stable; iron phosphorus ratio was 6/10, the removal rate of TP was high in the water amplitude fluctuation change.2, exogenous iron input affect elements in different organs of plants accumulated concentration difference, the law is Fe: P: roots and leaves, stems and leaves of root, stem and leaf TOC: root. Glyceria spiculosa on iron tolerance limit is 10 mg/L.3, organic and inorganic phosphorus in the wetland soil in which accounted for 50%.. The proportion of different forms of inorganic phosphorus, mainly iron bound phosphorus, inorganic phosphorus accounted for 45%. small Xingkai Lake has internal phosphorus load is very high, and the small Xingkai Lake Eutrophication and algae outbreak is closely related to.4, iron and phosphorus ratio is 5, amorphous iron, amorphous iron (Fe activity free iron) There was significant correlation with organic carbon (P0.05), and iron phosphorus ratio is 10 and there is no correlation between organic carbon Fe activity. Therefore, increasing organic carbon input is conducive to increase the content of organic matter, soil amorphous iron content increased, but not necessarily enhance soil iron oxide activity.5, starting from the in order to maintain the stability of the wetland, the normal growth of small Xingkai Lake glyceria spiculosa, water should be iron concentration control does not exceed 10 mg/L, the concentration of iron within glyceria spiculosa. Within the range of tolerance and glyceria spiculosa tolerance, put on the iron content is less than or equal to 5 mg/L, to control the phosphorus concentration the effect to water purification and recovery of contaminated water.

【学位授予单位】：中国科学院大学(中国科学院东北地理与农业生态研究所)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X524

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