| 滇池优势挺水植物茭草和芦苇降解过程中DOM释放特征研究 |
| 摘要点击 4270 全文点击 2199 投稿时间：2012-12-30 修订日期：2013-02-27 |
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| 中文关键词 茭草 芦苇 水溶性有机质 紫外-可见光谱 傅里叶红外光谱 三维荧光光谱 |
| 英文关键词 Zizania caduciflora Phragmites australis organic matter UV-visible spectroscopy Fourier transform infrared (FT-IR) spectroscopy three-dimensional excitation emission matrix fluorescence (3DEEM) spectroscopy |
| 作者 | 单位 | E-mail | | 谢理 | 南京师范大学地理科学学院, 南京 210023
中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 | | | 杨浩 | 南京师范大学地理科学学院, 南京 210023 | | | 渠晓霞 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
北京师范大学水科学研究院, 北京 100875 | | | 朱元荣 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
北京师范大学水科学研究院, 北京 100875 | | | 鄢元波 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012
河海大学环境学院, 南京 210098 | | | 张明礼 | 南京师范大学地理科学学院, 南京 210023 | | | 吴丰昌 | 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 | wufengchang@vip.skleg.cn |
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| 中文摘要 |
| 利用室内分解模拟实验,研究了滇池外海优势挺水植物茭草和芦苇(成熟期)的叶在水环境中降解过程,分析了其释放于水体中水溶性有机质(DOM)浓度和化学结构变化特征. 结果表明,植物分解可造成上覆水pH值升高,茭草和芦苇分解过程中上覆水中DOM浓度的变化趋势基本一致. 两种植物上覆水中水溶性有机碳(DOC)和水溶性有机氮(DON)的浓度均在8 h达到最大值,水溶性有机磷(DOP)的浓度在24 h达到最大值. 同时,茭草和芦苇残体内DOM释放强度和速率的变化趋势也基本一致. 两种植物DOC、DON和DOP的释放强度和速率都在8 h达到最大,且8 h的释放强度、释放速率、释放比例依次为DOC>DON>DOP. 另外,茭草和芦苇分解过程中DOM结构变化分析表明上覆水紫外吸收光谱中SUVA254值先升高再降低,傅里叶红外光谱中—OH特征峰消失,三维荧光光谱中类腐殖酸单位有机碳荧光强度增强. |
| 英文摘要 |
| Ground dry leaves of two emerged macrophytes Zizania Caduciflora and Phragmites australis from Lake Dianchi were soaked in distilled water in laboratory to track their DOM release process. The results showed that: 1 during soaking, concentration of DOM which was released to the overlying water by the two species increased at first, then decreased and increased again at last. Concentrations of DOC, DON, and DOP released by both species reached their peaks at the 8th, 8th, and 24th hour, respectively; 2 the two species showed the same DOM release trend, i. e., release rates and intensities of DOC, DON, and DOP by both species reached the peaks at the 8th hour, and for both of them, the release rates and intensities of DOC, DON, and DOP at the 8th hour followed the order of DOC>DON>DOP; 3 the SUVA254 value obtained by the UV-visible spectroscopy increased at first and then decreased; 4 Fourier transform infrared (FT-IR) spectroscopy showed that the characteristic peak —OH disappeared during the decomposition process; 5 intensity of the humic-acid fluorescence peak as showed by the 3D-EEM fluorescence intensity (F/DOC) increased along with degradation. |
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