题目 Title

Effects of dissolved oxygen on the decomposers and decomposition of plant litter in lake ecosystem.

期刊 Journal

Journal of Cleaner Production (IF=11.072)

作者 Author

Liu SW; He GJ; Fang HW; Xu S; Bai S

摘要 Abstract

Plant litter releases an amount of carbon, nitrogen and phosphorus during decomposition, which potentially has significant impacts on carbon, nitrogen, and phosphorus cycles and lake eutrophication. Dissolved oxygen (DO) plays an important role in changing the decomposition rate of litter and the major decomposers of litter. The decomposition rates of Phragmites australis, Triarrhena lutarioriparia and Carex spp under four DO concentration conditions (anaerobic group (0 mg/L DO), low DO group (6 mg/L DO), medium DO group (7 mg/L DO), high DO group (8 mg/L DO)) were measured in the laboratory for 120 days. The microorganisms community structure under the four DO conditions was tested to explore the major litter decomposer. The results showed that affected by litter quality, the decomposition rates of the three litters followed the order: Triarrhena lutarioriparia >Phragmites australis > Carex spp. A large amount of carbon, nitrogen and phosphorus were stored in water over litter decomposition. DO accelerated carbon and nitrogen release and promoted the decomposition of litter. The litter of high DO group decomposed 25.5%–42.0% more than that of anaerobic group. DO significantly affected the microbial community structure, and the proportion of microorganisms with the ability to decompose litter was higher in high DO group.

简介 Brief introduction

湖泊中溶解氧浓度的变化会改变枯落物的分解速度，进而影响湖泊的物质循环和能量流动过程。本文基于控制变量法，利用异位实验模拟研究了不同溶解氧浓度下芦苇、南荻和苔草的分解过程，分析了枯落物种类、溶解氧浓度、微生物群落结构等因素与枯落物分解速率的关系。相比于厌氧环境，有氧环境中具有分解枯落物能力的真菌和细菌的占比更高。这加速了有氧环境中的枯落物的分解。碳和氮元素的释放和溶解氧浓度有正相关关系，而磷元素的释放与溶解氧浓度有负相关关系。本文结果证明了增加溶解氧浓度会加快枯落物分解，并且分析了高溶解氧浓度下枯落物的主要分解者。

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