本文關(guān)鍵詞： 不同擾動 底泥磷 遷移轉(zhuǎn)化 不同形態(tài) 外源磷　出處：《蘇州科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：磷在水體中如何遷移轉(zhuǎn)化是個很值得研究的課題,現(xiàn)在,在構(gòu)建淺水湖泊磷遷移轉(zhuǎn)化理論體系過程中,有諸多關(guān)鍵的科學(xué)問題尚未解決,基于以往的研究主要集中在上覆水磷濃度形態(tài)的變化上而忽視了底泥界面對于水體磷遷移轉(zhuǎn)化的作用,僅此只能解決了上覆水中磷形態(tài)變化的科學(xué)問題。而實際上物理或者底棲生物對底泥產(chǎn)生擾動,都可以在橫向或者縱向使得底泥的微環(huán)境和微界面發(fā)生改變,而這樣一種改變對底泥磷的轉(zhuǎn)化可能造成重要的影響。因此,在揭示“底泥磷怎樣轉(zhuǎn)化的機制”科學(xué)規(guī)律方面仍需進(jìn)一步研究。本文主要從兩個方面研究問題,從僅存在內(nèi)源磷條件下,重點研究不同擾動下底泥的微環(huán)境和磷形態(tài)的橫向變化,輔之以上覆水的研究,再結(jié)合再投加外源磷情況下,縱向研究各組不同擾動下實驗過程中底泥磷的動態(tài)變化過程和上覆水磷的遷移過程。綜合分析底泥磷單純和組合疊加作用,以不同底泥擾動狀態(tài)下底泥磷遷移轉(zhuǎn)化過程機制作為突破重點,從而揭示內(nèi)源磷再生和轉(zhuǎn)化的行為過程機制等科學(xué)問題,能有利于整個淺水湖泊磷遷移轉(zhuǎn)化體系完善,可以從最基礎(chǔ)理論層面進(jìn)一步為淺水湖泊富營養(yǎng)化引發(fā)機制和預(yù)防策略的制定提供理論參考依據(jù)。結(jié)果表明,組合擾動下加入河蜆會進(jìn)一步增大了底泥的pH,對pH的影響范圍擴至深度為20~30mm,而河蜆和藻類的共同加入會導(dǎo)致底泥的pH進(jìn)一步擴大。隨著擾動因素的增加,上覆水及底泥內(nèi)部溶解氧含量明顯降低。河蜆的引入,增加了內(nèi)源磷釋放趨勢,導(dǎo)致上覆水中不同形態(tài)磷含量明顯增加(但部分磷可能來源于河蜆的排泄物),而藻類的加入對內(nèi)源磷釋放的誘導(dǎo)作用更持久,間隙水中DIP含量的降低則充分證明了這一點。隨著擾動因素的增加,內(nèi)源磷釋放幅度加大,并且由NH4Cl-P轉(zhuǎn)化為Fe/Al-P的比重也逐漸增加。河蜆的加入使內(nèi)源磷釋放幅度增大的主要原因是河蜆生物引灌、大量消耗溶解氧和增大pH。在外源磷輸入下,物理擾動能進(jìn)一步使上覆水中各種形態(tài)磷含量降低,而生物擾動和組合擾動的作用與之相反。物理擾動能減少間隙水中DIP的含量,但減少程度不如生物擾動組和組合擾動組高。3種擾動都能促進(jìn)Fe/Al-P的形成,其中,物理擾動的Fe/Al-P各層平均形成量最大,3種擾動都有利于Ca-P的生成,但物理擾動促進(jìn)作用最大。物理擾動組AAP含量一直在減小,說明物理擾動明顯促進(jìn)了AAP向閉蓄態(tài)的Fe/Al-P或者Ca-P轉(zhuǎn)化,而生物擾動和組合擾動在一定程度上也能促進(jìn)AAP向閉蓄態(tài)磷的轉(zhuǎn)化。
[Abstract]:How to transport and transform phosphorus in water is a topic worthy of study. Now, in the process of constructing the theoretical system of phosphorus transport and transformation in shallow lakes, there are many key scientific problems that have not been solved. Based on the previous studies on the change of phosphorus concentration in overlying water, the effect of sediment interface on phosphorus transport and transformation in water was neglected. Only this can solve the scientific problem of phosphorus form change in overlying water. In fact, physical or benthic disturbance to sediment can change the microenvironment and microinterface of sediment both horizontally and longitudinally. Such a change may have an important impact on the transformation of phosphorus in sediment. Therefore, it is still necessary to further study the scientific law of "how to transform phosphorus in sediment". Under the condition of only endogenous phosphorus, the microenvironment and the lateral change of phosphorus form of sediment under different disturbances were studied, supplemented by the study of overlying water, and then combined with the addition of exogenous phosphorus. The dynamic change process of phosphorus in sediment and the transport process of phosphorus in overlying water were studied longitudinally under different disturbances. The simple and combined superposition of phosphorus in sediment were analyzed synthetically. The mechanism of phosphorus migration and transformation in different sediment disturbance was taken as the key point to reveal the behavior mechanism of endogenous phosphorus regeneration and transformation. It can be beneficial to the improvement of phosphorus transport and transformation system of the whole shallow lake, and can provide theoretical reference for eutrophication initiation mechanism and prevention strategy of shallow water lake from the most basic theoretical level. The results show that. The pH of sediment was further increased by adding Corbicula flumeracea under combined disturbance, and the range of influence on pH was extended to 20mm 30mm. With the increase of disturbance factors, the content of dissolved oxygen in the overlying water and sediment decreased obviously. The introduction of Corbicula fluminea increased the release trend of endogenous phosphorus. As a result, the phosphorus content of different forms in the overlying water increased significantly (but some phosphorus probably originated from the excreta of Corbicula fluminea, and the effect of algal addition on endogenous phosphorus release was more lasting. The decrease of DIP content in interstitial water fully proves this. With the increase of disturbance factors, the release range of endogenous phosphorus increases. And the proportion of the conversion from NH4Cl-P to Fe/Al-P also gradually increased. The main reason for the increase of endogenous phosphorus release was the biological drainage and irrigation of Corbicula flumba. Under the input of exogenous phosphorus, the physical disturbance can further reduce the content of various forms of phosphorus in the overlying water. The effect of biological disturbance and combined disturbance is opposite. Physical disturbance can reduce the content of DIP in interstitial water. However, the reduction degree is lower than that of biological disturbance group and combined disturbance group. 3 kinds of disturbances can promote the formation of Fe/Al-P. Among them, the average formation amount of Fe/Al-P in physical disturbance layer is the largest. All the three kinds of disturbances are favorable to the formation of Ca-P, but the physical disturbance has the greatest effect. The AAP content of the physical disturbance group is decreasing all the time. The results show that physical disturbance can obviously promote the transformation of AAP to Fe/Al-P or Ca-P, while biological disturbance and combined disturbance can also promote the conversion of AAP to closed storage phosphorus to some extent.
【學(xué)位授予單位】：蘇州科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X52

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 蔡順智;李大鵬;王忍;劉焱見;徐W，

本文編號：1456295