互花米草入侵促进滨海湿地沉积物硝化过程

IF 3.9 2区 农林科学 Q1 AGRONOMY
Xianbiao Lin, Dongyao Sun, Zihao Wang, Dengzhou Gao, Weifang Hu, Wei Du
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引用次数: 0

摘要

目的互花米草(S. alterniflora)入侵对滨海湿地沉积物氮(N)生物地球化学过程影响显著。然而,其对地表(0-10 cm)和地下(10-20 cm)沉积物中不同硝化过程的影响及其机制尚不清楚。方法研究闽江口地区不同年限(6年、10年、14年)的本地马沙柏(Cyperus malacensis)和相邻互花葡萄球菌(S. alterniflora)入侵生境表层和地下沉积物中氨氧化古菌(AOA)、细菌(AOB)和comammox硝化螺(PARAOA、PARAOB和comammox)的潜在硝化速率、各自的相对贡献、功能基因(AOA、AOB和Ntsp-aomA)及其控制因素。结果3种硝化速率存在空间和季节差异。夏季表层(0-10 cm)和地下(10-20 cm)沉积物的硝化速率(5.57±2.28 μg - 1 d-1)显著高于冬季(3.78±1.76 μg - 1 d-1)。互花葡萄入侵提高了两个季节的硝化率(39.54 ~ 68.13%)和相关功能基因丰度(28.08 ~ 52.92%),其中表层沉积物(118.40 ~ 153.85%)显著高于次表层(32.80 ~ 73.17%)。此外,互花葡萄入侵后,PARAOA对硝化作用的相对贡献显著增强。PLS-PM结果进一步表明,沉积物硝化速率的时空波动主要受有机质积累和环境温度的驱动。结论互花草入侵对河口湿地沉积物硝化动力学具有重要影响,为估算河口湿地N收支和N周转提供了基础数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spartina alterniflora invasion enhances sediment nitrification processes in coastal wetland

Aims

Spartina alterniflora (S. alterniflora) invasion notably impacts sediment nitrogen (N) biogeochemical processes in coastal wetlands. However, its effects on different nitrification processes and their mechanisms in both surface (0–10 cm) and subsurface (10–20 cm) sediments remain unclear.

Methods

Potential nitrification rates mediated by ammonia-oxidizing archaea (AOA), bacteria (AOB), and comammox Nitrospira (PARAOA, PARAOB, and comammox rates), their relative contributions, functional genes (AOA, AOB, and Ntsp-aomA), and controlling factors were investigated in both surface and subsurface sediments of native Cyperus malacensis and adjacent S. alterniflora-invaded habitats with varying years (6, 10, and 14 years) in the Minjiang River Estuary, China.

Results

These three nitrification rates varied both spatially and seasonally. Summer nitrification rates (5.57 ± 2.28 μg N g–1 d–1) in both surface (0–10 cm) and subsurface (10–20 cm) sediments of these ecosystems were substantially higher than winter levels (3.78 ± 1.76 μg N g–1 d–1). S. alterniflora invasion increased nitrification rates (39.54–68.13%) and associated functional gene abundances (28.08–52.92%) in both seasons, with surface sediments (118.40–153.85%) markedly showing higher values than subsurface layers (32.80–73.17%). Additionally, the relative contribution of PARAOA in nitrification exhibited a marked enhancement with the S. alterniflora invasion. PLS-PM results further indicated that the spatiotemporal fluctuations in sediment nitrification rates were predominantly driven by organic matter accumulation and ambient temperature.

Conclusions

These findings highlight the substantial influence of S. alterniflora invasion on sediment nitrification dynamics, providing fundamental data for estimating N budgets and turnover in the estuarine wetlands.

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来源期刊
Plant and Soil
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.
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