| 洱海藻类水华高风险期沉积物氮磷释放通量时空变化 |
| 摘要点击 1924 全文点击 702 投稿时间：2019-07-18 修订日期：2019-09-19 |
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| 中文关键词 洱海 氮磷 释放通量 时空变化 沉积物 影响因子 |
| 英文关键词 Lake Erhai nitrogen and phosphorus release flux temporal and spatial variation sediment impact factor |
| 作者 | 单位 | E-mail | | 刘思儒 | 三峡大学水利与环境学院, 宜昌 443002
北京师范大学水科学研究院, 城市水循环与海绵城市技术北京市重点实验室, 北京 100875 | 929184565@qq.com | | 赵继东 | 大理州洱海流域管理局, 大理 671000 | | | 肖尚斌 | 三峡大学水利与环境学院, 宜昌 443002 | | | 倪兆奎 | 北京师范大学水科学研究院, 城市水循环与海绵城市技术北京市重点实验室, 北京 100875 | | | 王圣瑞 | 三峡大学水利与环境学院, 宜昌 443002
北京师范大学水科学研究院, 城市水循环与海绵城市技术北京市重点实验室, 北京 100875
云南省高原湖泊流域污染过程与管理重点实验室, 昆明 650034 | wangsr@bnu.edu.cn |
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| 中文摘要 |
| 选择藻类水华高风险期，研究沉积物氮磷释放通量时空变化及影响因素，以揭示沉积物氮磷释放对洱海水质影响.结果表明：①2009、2013和2018年洱海沉积物氮磷释放通量整体呈上升趋势，与2009相比，2013年增幅较大，而2018年与2013年相比增幅较小；溶解性总氮（DTN）释放通量在11.71~14.15mg·（m2·d）-1，其中有机氮（DON）释放通量在6.39~8.42 mg·（m2·d）-1，占DTN的58%，无机氮（DIN）释放通量在5.31~5.73 mg·（m2·d）-1，占DTN的42%；溶解性总磷（DTP）释放通量在0.11~0.14 mg·（m2·d）-1，无机磷（DIP）释放通量在0.07~0.09 mg·（m2·d）-1，占DTP的66%，有机磷（DOP）释放通量在0.04~0.05 mg·（m2·d）-1，占DTP的34%.②洱海沉积物氮磷释放通量空间差异也较大，其中氮释放通量呈南部 > 北部 > 中部趋势，磷释放通量表现为北部 > 中部 > 南部趋势；2009、2013和2018年相比，由北向南各湖区氮释放通量增幅分别为17%、13%和23%，磷释放通量增幅分别为19%、28%和29%.③2009、2013和2018年相比，洱海沉积物氮磷含量总体稳定，不是影响其释放通量变化主因，水华高风险期水体pH增加和DO下降是影响沉积物氮磷释放通量变化的重要因素，洱海保护应关注水体环境因子变化导致的沉积物氮磷释放增加问题. |
| 英文摘要 |
| Spatial and temporal characteristics of release fluxes of sediment nitrogen (N) and phosphorus (P) were investigated in the high-risk period of algal blooms in Lake Erhai. Moreover, the influence factors were examined. Results show that the release flux of N and P increased in recent years, exhibiting a clear increase in the period from 2009 to 2013, and a slight increase in the period since 2013. The release flux of dissolved total nitrogen (DTN) ranged between 11.71-14.15 mg·(m2·d)-1, within which the release flux of dissolved organic nitrogen (DON) and dissolved inorganic nitrogen (DIN) were 6.39-8.42 mg·(m2·d)-1 and 5.31-5.73 mg·(m2·d)-1, accounting for 58% and 42% of the DTN, respectively. The release flux of dissolved total phosphorus (DTP) ranged between 0.11-0.14 mg·(m2·d)-1, within which the release flux of dissolved organic phosphorus (DOP) and dissolved inorganic phosphorus (DIP) were 0.04-0.05 mg·(m2·d)-1 and 0.07-0.09 mg·(m2·d)-1, accounting for 34% and 66% of the DTP, respectively. The distribution of release flux of N showed a decreasing order:south > north > middle, while P was north > middle > south. The release flux of N increased by 17%, 13% and 23%, and the release flux of P increased by 19%, 28%, and 29% in north, middle, and south part of Lake Erhai from 2009 to 2018. Comparing the years 2009, 2013 and 2018, although the contents of N and P were stable, the release flux of N and P in the sediment was enhanced due to increasing pH and decreasing DO. Therefore, the increasing release of nitrogen and phosphorus from sediments, caused by changes in the water environment factors, should be paid attention to for the protection of Lake Erhai. |
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