The influences of mangrove grown on sedimentary nitrate reduction activities are more pronounced in sandy coasts compared to muddy coasts

IF 3.9 2区 农林科学 Q1 AGRONOMY
Dongfan Tian, Xianbiao Lin, Pengfei Zheng, Guoling Zhang, Jing Li, Mingrui Wang, Kangwei Liu, Tiantian Kong, Shiyuan Fan, Peng Guo, Sumei Liu
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Abstract

Background and aims

Mangrove forests have the potential to colonize and grow in both muddy and sandy coastal areas, but the effects of mangrove presence or absence on nitrate (NOx) reduction processes in these two types of coastal sediments have not been well studied.

Method

The dynamics of NOx reduction processes were studied in surface sediments (0–5 cm) of mangrove and the adjacent bare flat in muddy and sandy coasts of China using stable isotope (15N) pairing and quantitative PCR.

Result

Sediment NOx reduction rates (denitrification, anammox and DNRA) and their relative contributions (DEN%, ANA% and DNRA%) exhibited significant spatial and temporal variations, while the function-related genes (nirS, ANA 16S rRNA and nrfA) only exhibited significant differences in space. Sediment grain size, organic matter, nutrients, Fe2+/Fe3+, sulfide and temperature were critical factors controlling spatial and temporal variability in NOx reduction rates. Mangrove grown in muddy coasts only had a significant impact on DNRA rates (p < 0.05), while the impact on denitrification and anammox rates were both not significant (p > 0.05). The N retention index (NIRI) variation indicated that the presence of mangrove had a more significant positive role of N retention in sandy coasts than in muddy coasts.

Conclusion

Mangrove grown in sandy coast is more effective at promoting both sediment N-loss and N retention activities compared to those in muddy coast. And our results highlight the impact of mangroves on NOx reduction processes in muddy and sandy sediments, which is crucial for effective management and conservation efforts in nearshore ecosystems.

Abstract Image

与泥质海岸相比,生长在沙质海岸的红树林对沉积硝酸盐还原活动的影响更为明显
方法采用稳定同位素(15N)配对和定量PCR技术,研究了中国泥质和沙质海岸红树林表层沉积物(0-5 cm)及邻近裸露平地的氮氧化物还原过程的动态变化。结果沉积物氮氧化物还原率(反硝化、anammox和DNRA)及其相对贡献率(DEN%、ANA%和DNRA%)表现出显著的时空差异,而功能相关基因(nirS、ANA 16S rRNA和nrfA)仅表现出显著的空间差异。沉积物粒度、有机物、养分、Fe2+/Fe3+、硫化物和温度是控制氮氧化物还原率时空变化的关键因素。生长在泥质海岸的红树林仅对 DNRA 率有显著影响(p < 0.05),而对反硝化率和anammox 率的影响均不显著(p > 0.05)。结论 与泥质海岸相比,生长在泥质海岸的红树林能更有效地促进沉积物氮流失和氮滞留活动。我们的研究结果突显了红树林对泥质和沙质沉积物中氮氧化物还原过程的影响,这对近岸生态系统的有效管理和保护工作至关重要。
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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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