本文選題：可溶性有機(jī)碳 + 吸附��； 參考：《農(nóng)業(yè)現(xiàn)代化研究》2017年03期

【摘要】：為揭示pH對農(nóng)田土壤DOC吸附-解吸的影響,以亞熱帶紅壤區(qū)旱地和水田土壤為研究對象,采用室內(nèi)模擬實驗,對兩種土壤添加不同DOC量后分別在pH 4、pH 6和pH 8條件處理下的吸附和解吸試驗進(jìn)行研究,分析不同pH反應(yīng)條件下土壤對DOC的吸附和解吸過程,并計算土壤對DOC吸附和解吸的參數(shù),探討DOC吸附和解吸對pH的響應(yīng),初步探析吸附對DOC組成的影響。結(jié)果表明,同一土壤在pH 4、pH 6和pH 8條件下對DOC的吸附量差異顯著(P0.05)。隨著DOC初始濃度的增加,在pH 4、pH 6和pH 8條件下旱地土壤對DOC的平均吸附量為4.90、2.98和8.86 mg/g,水田土壤對DOC的平均吸附量為4.12、3.10和8.90 mg/g。土壤DOC吸附方程的擬合效果受到pH的顯著影響。吸附平衡后,DOC溶液的單位吸光度值E254、E260、E272和E280(芳香性、疏水性組分)的變化率隨pH增加而降低。兩種土壤對DOC芳香性、疏水性組分的吸附能力受土壤類型影響較小,但受土壤環(huán)境pH的影響顯著。兩種土壤對DOC的解吸量隨pH升高而降低。酸性條件下(pH 4),DOC的凈吸附量旱地土壤顯著大于水田土壤,但在pH 6和pH 8時兩種土壤的凈吸附量差異不顯著。由于紅壤區(qū)兩種土壤多呈酸性,這可能是造成紅壤區(qū)旱地和水田土壤DOC含量差異的主要原因之一。
[Abstract]:In order to reveal the effect of pH on the adsorption and desorption of DOC in farmland soil, a laboratory simulation experiment was carried out on the upland and paddy soils in the subtropical red soil region. The adsorption and desorption experiments of two kinds of soils with different amounts of DOC were studied under the conditions of pH 4, pH 6 and pH 8, respectively. The adsorption and desorption of DOC were analyzed under different pH reaction conditions. The parameters of adsorption and desorption of DOC on soil were calculated, the response of DOC adsorption and desorption to pH was discussed, and the effect of adsorption on the composition of DOC was discussed. The results showed that the adsorption capacity of DOC on the same soil under pH 4, pH 6 and pH 8 was significantly different from that of P0.05. With the increase of the initial concentration of DOC, the average adsorption capacity of DOC in dryland soil was 4.90 mg / g and 8.86 mg / g under pH 4, pH 6 and pH 8, and the average adsorption capacity of DOC in paddy soil was 4.12 mg / g and 8.90 mg / g, respectively. The fitting effect of soil DOC adsorption equation was significantly affected by pH. After adsorption equilibrium, the unit absorbance values of DOC solution E254, E260, E272 and E280 (aromatic, hydrophobic components) decreased with the increase of pH. The adsorption ability of the two kinds of soils to DOC aromaticity and hydrophobic component was less affected by soil type, but significantly affected by soil pH. The desorption of DOC from two soils decreased with the increase of pH. The net adsorption capacity of DOC in dry soil was significantly higher than that in paddy soil under acidic conditions, but there was no significant difference between the two soils at pH 6 and pH 8. Because the two soils are mostly acidic in the red soil region, this may be one of the main reasons for the difference of DOC content between the upland and paddy soils in the red soil region.
【作者單位】： 廣西師范大學(xué)生命科學(xué)學(xué)院;中國科學(xué)院亞熱帶農(nóng)業(yè)生態(tài)研究所亞熱帶農(nóng)業(yè)生態(tài)過程重點實驗室;
【基金】：國家自然科學(xué)基金項目(41471199) 國家重點研發(fā)計劃項目(2016YFD0200106-5)~~
【分類號】：S153

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