| 三峡库区小江支流沉积物硝化反硝化速率在蓄水期和泄水期的特征 |
| 摘要点击 2762 全文点击 1050 投稿时间：2016-06-29 修订日期：2016-09-26 |
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| 中文关键词 三峡库区 小江支流 沉积物 硝化速率 泄水期 蓄水期 反硝化速率 |
| 英文关键词 Three Gorge Dam Reservoir small tributary sediments water release period water collection period nitrification rate denitrification rate |
| 作者 | 单位 | E-mail | | 王静 | 西南大学资源环境学院, 重庆 400715
中国科学院重庆绿色智能技术研究院, 环境微生物与生态研究中心, 重庆 400714 | m15123820534@163.com | | 刘洪杰 | 中国科学院重庆绿色智能技术研究院, 环境微生物与生态研究中心, 重庆 400714 | | | 雷禹 | 中国科学院重庆绿色智能技术研究院, 环境微生物与生态研究中心, 重庆 400714 | | | 徐晶 | 中国科学院重庆绿色智能技术研究院, 环境微生物与生态研究中心, 重庆 400714 | | | 宋立岩 | 中国科学院重庆绿色智能技术研究院, 环境微生物与生态研究中心, 重庆 400714
中国科学院重庆绿色智能技术研究院, 水库水环境重点实验室, 重庆 400714 | songliyan@cigit.ac.cn | | 李勇 | 西南大学资源环境学院, 重庆 400715 | liyongwf@swu.edu.cn |
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| 中文摘要 |
| 三峡库区是新形成的生态系统，沉积物特征较之成库前有显著改变；研究库区小江支流——南河沉积物的硝化与反硝化过程可以为库区氮素管理提供科学依据，而反季节蓄水和泄水，沉积物-水界面硝化与反硝化速率特征鲜见报道.实验选取库区开县南河沉积物为研究对象，在2015年泄水期（8月）和蓄水期（11月）采集上、下游以及南河与小流域菁林溪交汇处沉积物样品，测定其理化指标；同时通过实验室模拟沉积物水环境，以乙炔抑制法测定泄水期与蓄水期沉积物的硝化反硝化速率.结果表明，蓄水期沉积物总氮（total nitrogen，TN）、铵态氮（ammonium nitrogen，NH4+-N）、硝态氮（Nitrate nitrogen，NO3--N）及总有机碳（total organic carbon，TOC）等理化指标均显著高于泄水期（P<0.05），这说明蓄水期有外源物质入库；沉积物硝化速率在蓄水期[194.06 μmol·（m2·h）-1]显著高于泄水期[16.52 μmol·（m2·h）-1]，且硝化速率与沉积物理化特征（TN、NH4+-N、NO3--N、TOC）存在显著正相关；沉积物反硝化速率则与硝化速率相反，泄水期[647.20 μmol·（m2·h）-1]高于蓄水期[24.04 μmol·（m2·h）-1]，其与沉积物理化指标（TN、NH4+-N、NO3--N）呈显著负相关. |
| 英文摘要 |
| Three Gorge Dam Reservoir (TGDR) is a new forming ecosystem and its sediments dynamics remains unknown. Investigation on the nitrification and denitrification dynamics of sediments of TGDR during water collection and release events-anti-seasonal actions-is critical for nitrogen management in TGDR. In this study, we sampled sediments in three locations (upstream, center, and downstream along water flow) of South River, located in a typical small tributary, Nanhe, in TGDR during 2015 water collection and release events to characterize its physiochemical property and determine its nitrification and denitrification rates using acetylene inhabitation method. The results showed that the concentrations of physiochemical parameters of sediments (total carbon, total nitrogen, nitrate, and ammonia) were significantly higher (P<0.05) in water collection event than those in water release event, suggesting there were external materials (e. g., soil) entering into TGDR. Furthermore, the nitrification rate of sediments in water collection event[194.06 μmol·(m2·h)-1] was significantly higher than that in water release event[16.52 μmol·(m2·h)-1]. Sediments nitrification rate was positively correlated to the physiochemical parameters. In contract, the denitrification rate of sediments was higher in water release event[647.20 μmol·(m2·h)-1] than that in water collection event[24.04 μmol·(m2·h)-1). Accordingly, the denitrification rate of sediments was negatively correlated to the physiochemical parameters. |
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