本文選題：溶解性有機(jī)物　切入點(diǎn)：融雪　出處：《環(huán)境科學(xué)學(xué)報(bào)》2016年12期 　論文類型：期刊論文

【摘要】：利用土壤浸提實(shí)驗(yàn)和土柱淋洗實(shí)驗(yàn),考察了化學(xué)離子的種類與濃度對(duì)進(jìn)入融雪徑流的土壤溶解性有機(jī)物(DOM)的含量和光譜學(xué)特性的影響,以及不同化學(xué)特征的積雪融化過程中土壤DOM的釋放規(guī)律.土壤浸提實(shí)驗(yàn)結(jié)果表明,隨著Na~+、Mg~(2+)和Ca~(2+)濃度的升高,土壤浸提液中的溶解性有機(jī)碳(DOC)濃度顯著降低;隨著Cl~-、SO_4~(2-)、Mg~(2+)和Ca~(2+)濃度的升高,土壤浸提液中波長(zhǎng)254 nm處的紫外吸光度(UV-254)逐漸降低;隨著Na~+和Mg~(2+)濃度的升高,土壤浸提液中單位濃度DOC的紫外吸收值(SUVA)值逐漸升高.NO_3~-、SO_4~(2-)和Na~+的濃度過高或過低時(shí),土壤浸提液中DOM的類腐殖酸和類富里酸熒光峰強(qiáng)度較低;隨著Cl~-、Mg~(2+)和Ca~(2+)濃度的升高,土壤浸提液中DOM的類腐殖酸熒光峰強(qiáng)度逐漸降低.土柱淋溶實(shí)驗(yàn)結(jié)果表明,類腐殖酸和類富里酸熒光物質(zhì)是土壤淋濾液中的主要熒光物質(zhì).與純水相比,融雪水作為淋洗液導(dǎo)致土壤淋濾液中DOC濃度的降低,以及類微生物代謝產(chǎn)物熒光峰強(qiáng)度的增高.凍融交替抑制DOM自土壤解吸進(jìn)入淋濾液,并且導(dǎo)致土壤淋濾液中芳香族化合物相對(duì)含量的降低.
[Abstract]:The effects of kinds and concentrations of chemical ions on the content and spectroscopic properties of dissolved organic matter (DOM) in soil into snowmelt runoff were investigated by soil extraction and column leaching experiments. The results of soil extraction experiments showed that the concentration of dissolved organic carbon (DOM) decreased significantly with the increase of Na ~ (2) and Ca~(2) concentrations. The UV absorbance at 254nm in the soil extract gradually decreased with the increase of the concentration of Cl-so _ 4 and Ca~(2), and with the increase of the concentration of Na ~ and Mg~(2, the UV absorbance at 254nm in the soil leachate decreased gradually, and the concentration of Na ~ and Mg~(2 increased with the increase of the concentration of Ch _ (2) -so _ (4) and Mg~(2). The UV absorption value of unit concentration of DOC in soil extract increased gradually. When the concentration of no _ 3 and Na ~ was too high or too low, the fluorescence peak intensity of humic acid and fulvic acid-like acid in soil extract solution was lower than that in soil extract solution, and with the increase of Cl-Mg2) and Ca~(2) concentration, the fluorescence peak intensity of DOM in soil extract solution was lower than that in soil extract solution, and with the increase of Cl-Mg2) and Ca~(2 concentration, the fluorescence peak intensity of humic acid and fulvic acid-like acid in soil extract solution was lower than that in soil extract solution. The intensity of humic acid-like fluorescence peak of DOM in soil extract gradually decreased. The results of column leaching experiment showed that humic acid-like and fulvic acid-like fluorescent substances were the main fluorescent substances in soil leachate. The concentration of DOC in the leachate and the intensity of fluorescence peak of the metabolites of microbes were decreased by snow melt water as the eluent. Freeze-thaw alternately inhibited DOM desorption from the soil into the leachate. And the relative content of aromatic compounds in soil leachate was decreased.
【作者單位】： 遼寧大學(xué)環(huán)境學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(No.21107039) 遼寧省教育廳科學(xué)技術(shù)研究項(xiàng)目(No.L2011002) 遼寧省科學(xué)技術(shù)計(jì)劃項(xiàng)目(No.2011230009)~~
【分類號(hào)】：X144;X52

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