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Decomposition Behavior of Triarrhena lutarioriparia Tissues in Dongting Lake Water: A Laboratory Simulation Study
Clean - Soil Air Water ( IF 1.7 ) Pub Date : 2021-12-26 , DOI: 10.1002/clen.202000426
Yuanyuan Zhao 1 , Youze Xu 1 , Guangyi Fu 1 , Nan Tang 1, 2 , Shuang Zhou 1
Affiliation  

Following the overall withdrawal of papermaking enterprises, Triarrhena lutarioriparia, a most abundant macrophyte of Dongting Lake wetland, will remain to be uncut and decay in the lake water. The decomposition dynamics of T. lutarioriparia tissues and the decomposition effects on water quality are investigated in this study. The results show that two main processes are observed during the 90-day decomposition period of T. lutarioriparia: rapid leaching and gradual biodegradation. During the initial 10-day leaching process, the initial weight loss of leaves, spikes, and stems reached 13.33%, 12.44%, and 4.67%, respectively; meanwhile, 15.12–32.62% of total nitrogen and 24.16–45.45% of total phosphorus in the tissues are released to the water. The decomposition rate of T. lutarioriparia tissues is in the order: spikes (0.0053 day−1) > leaves (0.0045 day−1) > stems (0.0033 day−1). The T. lutarioriparia decomposition exerted adverse effects on the lake water quality, including the depletion of dissolved oxygen, the increase in concentrations of organic matter and nutrients, especially during the rapid leaching process. Such adverse effects are significantly associated with both the biomass (p < 0.001) and the species of T. lutarioriparia tissues (p < 0.05).

中文翻译:

洞庭湖水中三叶草组织的分解行为:实验室模拟研究

随着造纸企业的全面退出,洞庭湖湿地最丰富的大型植物三叶草仍将在湖水中未切割和腐烂。本研究研究了T. lutaririparia组织的分解动力学及其分解对水质的影响。结果表明,在T. lutarioriparia的 90 天分解期内,观察到两个主要过程: 快速浸出和逐渐生物降解。在最初的10天浸出过程中,叶、穗和茎的初始失重分别达到13.33%、12.44%和4.67%;同时,组织中15.12-32.62%的总氮和24.16-45.45%的总磷被释放到水中。T. lutarioriparia组织的分解速率顺序为:穗状花序(0.0053 天-1)> 叶子(0.0045 天-1)> 茎(0.0033 天-1)。T. lutarioriparia分解对湖泊水质产生不利影响,包括溶解氧的消耗,有机物和营养物质浓度的增加,特别是在快速浸出过程中。这种不利影响与生物量 (p < 0.001) 和 T. lutarioriparia 组织的种类 (p < 0.05) 显着相关。
更新日期:2021-12-26
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