| 山地城市新建湖库氮磷营养盐时空特征研究 |
| 摘要点击 2819 全文点击 1321 投稿时间：2014-03-17 修订日期：2014-04-21 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 氮磷营养盐 时空分布 水质 龙景湖 山地城市 |
| 英文关键词 nitrogen and phosphorus nutrients spatiotemporal distribution water quality Longjing Lake mountainous city |
|
| 中文摘要 |
| 重庆市园博园龙景湖是一新建的山地河道型深水湖库. 通过为期一年对龙景湖水库氮磷营养盐的监测，研究龙景湖水库氮磷营养盐的时空格局、变化特点和相互关系，分析园博园旅游区人为活动的特点以及上游流域来水水质对水库水质的影响. 结果表明，龙景湖水库整体总氮和总磷年均浓度分别为（1.42±0.46）mg ·L-1和（0.09±0.03）mg ·L-1，存在丰水期平水期低于枯水期的季节性波动. 湖库主水体区、开阔水体区和库湾区受所在区域影响因素不同，氮磷浓度分布存在时空异质性：主水体区季节变化特征与湖库整体基本一致；两个开阔水体区将主水体区分别与上游、库湾连接，顺水流方向的氮磷浓度沿程逐渐降低，开阔水体区氮磷营养盐受上游来水水质和周围园区功能布设影响；典型库湾区营养盐浓度高于主水体区和开阔水体区. 湖库丰水期颗粒态的氮、磷占总氮、总磷质量分数分别为51.7%和72.8%，枯水期硝酸盐氮、活性磷酸盐分别占总氮、总磷质量分数为42.0%和59.4%，氨氮和溶解态有机氮占总氮质量分数相对稳定；氮磷比全年均值为18.429±7.883，营养物限制情况上，氮、磷为主要限制因素的时段分别为5.3%、21.2%. |
| 英文摘要 |
| Longjing Lake in Chongqing Expo Garden is a typical representative of mountainous urban lake. Based on water quality monitoring of Longjing Lake, spatiotemporal characteristics of nitrogen and phosphorus and their relations were analyzed, combined with natural and human factors considered. The results indicated that annual average concentrations of TN and TP in overall lake were (1.42±0.46)mg ·L-1 and (0.09±0.03)mg ·L-1, nitrogen and phosphorus concentrations fluctuated seasonally which were lower during the flooding season than those during the dry season. Nitrogen and phosphorus concentration in main water area, open water areas and bay areas of Longjing Lake were distributed with temporal and spatial heterogeneity by different regional influencing factors. The seasonal variation of the main water area was basically consistent with overall lake. Two open water areas respectively connected the main water area with the upstream region, bay areas. TN and TP concentrations were gradually reduced along the flow direction. Upstream water quality and surrounding park functional layout impacted nitrogen and phosphorus nutrient concentrations of open water areas. Nutrient concentrations of typical bay areas were higher than those of main water area and open water areas. The mean mass fraction of PN/TN and PP/TP accounted for a large proportion (51.7% and 72.8%) during the flooding season, while NO3--N/TN and SRP/TP accounted for more (42.0% and 59.4%) during the dry season. The mass fraction of ammonia nitrogen and dissolved organic nitrogen in total nitrogen were relatively stable. The annual mean of N/P ratio was 18.429±7.883; the period of nitrogen limitation was 5.3% while was 21.2% for phosphorus limitation. |
