Li Zhaoxin, Liu Peng, Sun Zhiyan, Ma Ning, Lian Jijian
School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan 056038, Hebei Province, China.
Hebei Key Laboratory of Intelligent Water Conservancy, Handan 056038, Hebei Province, China.
Heliyon. 2022 Nov 10;8(11):e11441. doi: 10.1016/j.heliyon.2022.e11441. eCollection 2022 Nov.
Two types of aquatic plants commonly used for the ecological restoration of rivers and lakes, (Lour.) Hara and Fraser ex Roscoe, were selected and grouped by plant parts (root, stem and foliage), and decomposing release experiments were conducted. The influence of the released substances on the water quality was analyzed, as well as the amount of nutrients released by each part of these two plants. The calculated maximum chemical oxygen demand releases from the foliage of and the foliage of were approximately 5.4 g/kg and 22.65 g/kg, respectively. Through three-dimensional fluorescence spectrum and parallel factor analyses, the different material compositions of the decomposing liquids from the plants were determined, and the main dissolved organic components of the decomposing liquid of were amino-acid-like and microbially derived humics, and those were soluble microbial by-product-like substances. The carbon-to-nitrogen ratio and humification index of each experimental group were compared. The experimental results showed that different parts of and had different rates of nutrient release. The dissolved organic matter in the decomposed solution can be utilized by microorganisms, which have the potential to become additional carbon sources. This study provides a new method for the treatment of aquatic plant litter. Different plant species can be used in combination according to their characteristics to ensure that better results are achieved during water treatment processes that use plant decomposing liquids as additional carbon sources.
选取了两种常用于河湖生态修复的水生植物，（ Lour.） Hara和Fraser ex Roscoe，按植物部位（根、茎和叶）进行分组，并开展了分解释放实验。分析了释放物质对水质的影响，以及这两种植物各部位释放的养分含量。计算得出，的叶和的叶的最大化学需氧量释放量分别约为5.4 g/kg和22.65 g/kg。通过三维荧光光谱和平行因子分析，确定了植物分解液的不同物质组成，的分解液主要溶解有机成分是类氨基酸和微生物源腐殖质，而的是类可溶性微生物副产物物质。比较了各实验组的碳氮比和腐殖化指数。实验结果表明，和的不同部位养分释放速率不同。分解液中的溶解有机物可被微生物利用，有成为额外碳源的潜力。本研究为水生植物残体处理提供了一种新方法。可根据不同植物种类的特性进行组合使用，以确保在利用植物分解液作为额外碳源的水处理过程中取得更好效果。
