| 浑太河不同水生态区营养盐对底栖硅藻的影响及阈值 |
| 摘要点击 3708 全文点击 1331 投稿时间：2017-04-20 修订日期：2017-05-24 |
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| 中文关键词 浑太河 水生态区 底栖硅藻 LOWESS 阈值 |
| 英文关键词 Huntai River aquatic ecoregion benthic diatom LOWESS threshold |
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| 中文摘要 |
| 为全面了解浑太河不同水生态区营养盐对底栖硅藻的影响状况及进行底栖硅藻群落的保护，本研究对3个水生态区共287个采样点的营养盐因子（NH4+-N、TP）及底栖硅藻群落进行调查分析，并通过局部加权回归散点修匀法（locally weighted scatterplot smoothing，LOWESS）探究了底栖硅藻群落的NH4+-N、TP保护阈值.结果表明：①浑太河3个水生态区NH4+-N、TP浓度差异性显著并呈现出水生态Ⅰ区 < 水生态Ⅱ区 < 水生态Ⅲ区的趋势. ②底栖硅藻特征指标[运动性硅藻百分比、敏感性硅藻百分比、具柄硅藻百分比、Pielou均匀度指数、特定污染敏感指数（specific polluosensitivity index，IPS）、硅藻生物指数（biological diatom index，IBD）、硅藻属指数（generic diatom index，IDG）]均在3个水生态区间存在差异，运动性硅藻百分比呈现出水生态Ⅰ区 < 水生态Ⅱ区 < 水生态Ⅲ区的变化，而其余6个生物参数的变化与之相反，表明水生态Ⅲ区底栖硅藻受到的干扰最大，水生态Ⅰ区最小. ③经LOWESS拟合和独立样本T检验，发现3个水生态区底栖硅藻的NH4+-N、TP保护阈值不同，水生态Ⅰ区、Ⅱ区、Ⅲ区的NH4+-N阈值分别为0.13、0.30、1.98 mg·L-1，TP阈值分别为0.04、0.06、0.20 mg·L-1.本研究可为浑太河3个水生态区底栖硅藻群落的保护和水生态区管理提供理论依据. |
| 英文摘要 |
| Benthic diatom communities and nutrient gradients were investigated from 287 sampling sites in three aquatic ecoregions (AE) of the Huntai River to characterize the spatial distribution of nutrients and the benthic diatom communities. Locally weighted scatterplot smoothing (LOWESS) was used to analyze the thresholds for nitrogen and phosphorus. The results showed that:① The concentration of ammonia nitrogen and total phosphorus significantly differs in the three AEs, and shows a tendency of AEⅠ < AE Ⅱ < AE Ⅲ. ② To reveal the structure of benthic diatom communities, various benthic diatom indexes, including the sportive diatom percentage, sensitive diatom percentage, stipitate diatom percentage, Pielou evenness index, specific polluosensitivity index (IPS), biological diatom index (IBD), and generic diatom index (IDG) were analyzed. The sportive diatom percentage varied significantly in AEI, AEⅡ, and AE Ⅲ, with the highest percentage observed in AEⅢ and the lowest in AEⅠ. However, the other six indexes exhibited an opposite trend. All revealed that AE Ⅲ has been seriously damaged, while AEⅠ is less disturbed than AEⅡ and AE Ⅲ. ③ LOWESS fitting curves show thresholds for ammonia nitrogen (NH4+ -N) in the three aquatic ecoregions as 0.13, 0.30, and 1.98 mg·L-1, respectively and for total phosphorous (TP) were 0.04, 0.06, and 0.20 mg·L-1. All results were tested by independent-sample T tests. This study will provide assistance for effectively protecting the benthic diatom community in different aquatic ecoregions and also provide a theoretical basis for water management. |
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