Sediment hardening changes the physicochemical characteristics and microbial diversity of sediment and has potential effects on submerged macrophytes

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2024-12-10 DOI:10.1007/s11104-024-07113-8

Chuanxin Chao, Xiaorong Chen, Shen Gong, Feng Li, Zhengmiao Deng, Yeai Zou, Yonghong Xie

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引用次数: 0

Abstract

Background and aims

The intensification of climate change and increases in dam construction have altered the inherent hydrological rhythms of river-connected lakes and led to the formation of a new feature of lake sediment known as sediment hardening. However, changes in sediment characteristics caused by sediment hardening and their potential effects on submerged macrophytes remain unclear.

Methods

A field investigative study and mesocosm experimental study were performed in Dongting Lake to provide evidence on how variations in sediment hardening affect the physical, chemical, and microbial properties of sediments and subsequently impact the health of submerged macrophytes.

Results

Sediment hardening mainly changes the characteristics of the 0–20 cm sediment layer by increasing the proportion of macroaggregates, decreasing the bulk density (BD) and pH, and increasing the contents of sediment total nitrogen (TN), total phosphorus (TP), and organic carbon (SOC). Sediment type (hardened and unhardened) and depth (0–5, 10–15, and 20–25 cm) significantly influenced the richness indices of bacteria and fungi, with sediment type having the greatest effect on the fungal community composition and sediment depth having the greatest effect on the bacterial community composition. The combination of high water depth and sediment hardening resulted in shorter root systems in submerged macrophytes that are not conducive to growth.

Conclusion

Our study is the first to establish a link between sediment hardening and the growth and development of submerged macrophytes. Moreover, it highlights the potential role of sediment hardening and water level interactions in regulating the development and growth of submerged macrophytes in river-connected lakes.

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沉积物硬化改变了沉积物的物理化学特征和微生物多样性，并对沉水植物有潜在的影响

背景与目的气候变化的加剧和大坝建设的增加改变了河流相连湖泊固有的水文节律，并导致湖泊沉积物形成一种新的特征，即沉积物硬化。然而，沉积物硬化引起的沉积物特征变化及其对水下大型植物的潜在影响尚不清楚。方法采用野外调查和中生态实验研究方法，探讨沉积物硬化变化如何影响沉积物的物理、化学和微生物特性，进而影响沉水植物的健康。结果沉积物硬化主要通过增加大团聚体比例、降低容重（BD）和pH、增加沉积物总氮（TN）、总磷（TP）和有机碳（SOC）含量来改变0 ~ 20 cm沉积物层的特征。沉积物类型（硬化和未硬化）和深度（0-5、10-15和20-25 cm）显著影响细菌和真菌的丰富度指数，其中沉积物类型对真菌群落组成的影响最大，沉积物深度对细菌群落组成的影响最大。高水深和沉积物硬化共同作用导致沉水植物根系较短，不利于生长。结论本研究首次建立了沉积物硬化与沉水植物生长发育之间的联系。此外，它还强调了沉积物硬化和水位相互作用在调节河流湖泊淹没植物发育和生长中的潜在作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.