| 大型饮用水源地入库河流营养状态与N∶P协同调控浮游植物资源利用效率 |
| 摘要点击 322 全文点击 10 投稿时间：2025-08-28 修订日期：2025-11-13 |
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| 中文关键词 丹江口水库 浮游植物 资源利用效率（RUE） 营养状态 N∶P |
| 英文关键词 Danjiangkou Reservoir phytoplankton resource use efficiency（RUE） trophic status nitrogen-to-phosphorus ratio |
| DOI 10.13227/j.hjkx.202508297 |
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| 中文摘要 |
| 丹江口水库作为南水北调中线工程的饮用水源地，其入库河流的生态系统功能对水质维护与富营养化防控具有深远影响. 浮游植物的资源利用效率（RUE）作为评估生态系统功能的关键指标，对水体中养分循环和营养传递过程有决定性作用，为揭示RUE对营养状态（TLI）与环境化学计量比（N∶P）的响应机制，于2024年4月、9月以及2025年2月对丹江口水库16条入库河流进行浮游植物采集和水质分析，结果表明：①丹江口入库河流浮游植物共鉴定出6门50属，硅藻门占绝对优势，存在优势类群隐藻向蓝藻-绿藻演替的趋势，表明水体正由中-贫营养向中-富营养状态发展；② TLI、 N∶P和群落结构等3类变量分别解释了RUEN和RUEP变化的84.9%和77.9%，表明TLI、 N∶P和群落结构是影响RUE的关键因子；③浮游植物的磷利用效率RUEP与N∶P呈正相关，氮利用效率RUEN与N∶P负相关；RUEP与RUEN随TLI增加均呈现先升后降的驼峰型变化；TLI与N∶P对RUE具有协同调控作用，二者也会影响浮游植物的群落组成，进一步作用于RUE. 研究结果揭示了浮游植物RUE对营养状态与N∶P的响应规律及其协同调控机制，可为理解富营养化过程及藻华防控提供理论依据. |
| 英文摘要 |
| As an important drinking water source， the ecosystem functions of the inflowing rivers to the Danjiangkou Reservoir have a profound impact on water quality and the prevention and control of eutrophication. Phytoplankton resource use efficiency （RUE）， as a key indicator for evaluating ecosystem functions， plays a decisive role in water nutrient cycling and nutrient transfer. To elucidate the response mechanisms of RUE to trophic state （TLI） and environmental stoichiometry （N∶P）， phytoplankton were collected and identified， and water quality was analyzed in 16 inflowing rivers of the Danjiangkou Reservoir in April and September 2024 and February 2025. The results show that： ① Phytoplankton in the inflowing rivers of Danjiangkou Reservoir comprised 6 phyla and 50 genera， with Bacillariophyta being the dominant group. An observed succession trend from Cryptophyta to Cyanophyta-Chlorophyta suggests a transition of the water body from mesotrophic-oligotrophic to mesotrophic-eutrophic conditions. Eutrophic waters exhibited the phenomenon of high species richness but low diversity. ② TLI， N∶P， and community structure explained 84.9% and 77.9% of the variations in RUEN and RUEP， respectively， indicating that these three variables were key factors influencing RUE. ③ Phosphorus use efficiency （RUEP） was positively correlated with N∶P， whereas nitrogen use efficiency （RUEN） was negatively correlated. Both RUEP and RUEN showed a hump-shaped response to increasing TLI， rising initially and then declining. TLI and N∶P exerted a synergistic regulatory effect on RUE. They also influenced phytoplankton community composition， which in turn affected RUE. The results reveal the response patterns and synergistic regulatory mechanisms of phytoplankton RUE to trophic state and N∶P， providing a theoretical basis for understanding eutrophication processes and controlling algal blooms. |
