{"title":"The influences of mangrove grown on sedimentary nitrate reduction activities are more pronounced in sandy coasts compared to muddy coasts","authors":"Dongfan Tian, Xianbiao Lin, Pengfei Zheng, Guoling Zhang, Jing Li, Mingrui Wang, Kangwei Liu, Tiantian Kong, Shiyuan Fan, Peng Guo, Sumei Liu","doi":"10.1007/s11104-024-07016-8","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Background and aims</h3><p>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 (NO<sub>x</sub><sup>−</sup>) reduction processes in these two types of coastal sediments have not been well studied.</p><h3 data-test=\"abstract-sub-heading\">Method</h3><p>The dynamics of NO<sub>x</sub><sup>−</sup> 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 (<sup>15</sup>N) pairing and quantitative PCR.</p><h3 data-test=\"abstract-sub-heading\">Result</h3><p>Sediment NO<sub>x</sub><sup>−</sup> 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 (<i>nirS</i>, ANA 16S rRNA and <i>nrfA</i>) only exhibited significant differences in space. Sediment grain size, organic matter, nutrients, Fe<sup>2+</sup>/Fe<sup>3+</sup>, sulfide and temperature were critical factors controlling spatial and temporal variability in NO<sub>x</sub><sup>−</sup> reduction rates. Mangrove grown in muddy coasts only had a significant impact on DNRA rates (<i>p</i> < 0.05), while the impact on denitrification and anammox rates were both not significant (<i>p</i> > 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.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>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 NO<sub>x</sub><sup>−</sup> reduction processes in muddy and sandy sediments, which is crucial for effective management and conservation efforts in nearshore ecosystems.</p>","PeriodicalId":20223,"journal":{"name":"Plant and Soil","volume":null,"pages":null},"PeriodicalIF":3.9000,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plant and Soil","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1007/s11104-024-07016-8","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRONOMY","Score":null,"Total":0}
引用次数: 0
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.
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.