School of Environmental Ecology and Biological Engineering, Institute of Changjiang Water Environment and Ecological Security, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Wuhan Institute of Technology, Wuhan, 430205, China.
School of Environmental Ecology and Biological Engineering, Institute of Changjiang Water Environment and Ecological Security, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Wuhan Institute of Technology, Wuhan, 430205, China.
Environ Res. 2024 Mar 15;245:118063. doi: 10.1016/j.envres.2023.118063. Epub 2023 Dec 29.
Priming effect (PE) is recognized as an important potential mechanism for dissolved organic matter (DOM) degradation in aquatic ecosystems. However, the priming effects (PEs) of various priming substances on the degradation of DOM pools in urban lakes along diverse trophic states remain unknown. To address this knowledge gap, the PEs and drivers of glucose and plant leachate of lake water with three trophic states were investigated. We reveal differences in the bioavailability of DOM in lake water, glucose, and plant leachate. The PE of the same priming substance was significantly higher in highly-eutrophic lake water than in mesotrophic lake. The priming intensity induced by glucose was significantly higher when compared to plant leachate. Regarding the addition of glucose, humic-like components (C1 and C3) showed slight PE, while the tyrosine-like component C2 showed negative PE. However, the positive PEs were observed on three components after adding plant leachate. The driver of PE by glucose shifted from nutrients to DOM components with increasing trophic levels. The PEs induced by plant leachate were affected by nutrients, chlorophyll-a (Chl-a), water chemistry, and DOM components in lightly/moderately-eutrophic lake water. This study revealed the intensities, directions, and drivers of PEs, providing essential insights into uncovering the DOM biogeochemical process in urban lakes.
启动效应（PE）被认为是水生生态系统中溶解有机质（DOM）降解的一个重要潜在机制。然而，不同营养状态下城市湖泊中各种启动物质对 DOM 库降解的启动效应（PE）仍不清楚。为了解决这一知识空白，本研究调查了三种营养状态下湖泊水中葡萄糖和植物浸提液的启动效应（PE）及其驱动因素。我们揭示了湖泊水中 DOM、葡萄糖和植物浸提液的生物可利用性的差异。高营养湖泊水中相同启动物质的启动效应明显高于中营养湖泊。与植物浸提液相比，葡萄糖诱导的启动强度更高。关于葡萄糖的添加，腐殖质样组分（C1 和 C3）表现出轻微的启动效应，而酪氨酸样组分 C2 表现出负启动效应。然而，添加植物浸提液后，三个组分均表现出正启动效应。葡萄糖引起的 PE 的驱动因素从营养物质向 DOM 组分转移，随着营养水平的增加而增加。植物浸提液引起的 PE 受营养物质、叶绿素-a（Chl-a）、水化学和轻/中度富营养化湖泊水中 DOM 组分的影响。本研究揭示了 PE 的强度、方向和驱动因素，为揭示城市湖泊中 DOM 生物地球化学过程提供了重要的见解。
