微生物生命策略介导的碳代谢差异解释了倒花菜和无瓣海桑在碳固存方面的差异

IF 3.8 1区 农林科学 Q1 FORESTRY
Fuyuan Duan , Fengxiao Tan , Xuming Zhao , Hui Feng , Jiakai Wang , Hao Peng , Nannan Zhang , Yelin Huang
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引用次数: 0

摘要

土壤有机碳(SOC)在红树蓝碳形成中起着至关重要的作用,但引种红树和原生红树之间微生物介导的土壤有机碳固存的差异尚不清楚。本研究比较了引进无片海桑和原生倒树花红树林沉积物中有机碳库(顽固性有机碳库、活性碳库)和残碳源(氨基糖、木质素酚类和脂类)的差异,并将其与微生物的生命策略和碳代谢能力联系起来。结果表明,无瓣蒿(SA)沉积物的有机碳积累量约为obovata (KO)沉积物的30% ~ 50%。ROC是长期固存中SOC的主要形式(76%-83%),而木质素酚类、氨基糖和脂类是ROC的重要来源。在无瓣草沉积物中,ROC含量与氨基糖呈正相关,这是因为更多的r-战略微生物可以迅速将植物来源的碳转化为微生物生物量,随后转化为微生物坏死块。相反,在倒叶松沉积物中,ROC含量与木质素酚类和脂类浓度呈较强的正相关。表土中较多的k -战略型真菌增加了土壤酶活性,而底土中较多的k -战略型细菌增加了土壤碳利用能力,从而增加了两层土壤中植物残留物的木质素酚类和脂类。同时,高Ca2+浓度在K. obovata沉积物中保护了三种残余碳免受进一步的微生物分解。本研究为探讨红树林生态系统微生物生命策略介导的有机碳固存的分子机制提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microbial life strategies-mediated differences in carbon metabolism explain the variation in SOC sequestration between Kandelia obovata and Sonneratia apetala
Soil organic carbon (SOC) plays a crucial role in mangrove blue carbon formation, yet the differences in microbe-mediated underlying SOC sequestration between introduced and native mangroves remain unclear. Here, we compared the SOC pool, including recalcitrant organic carbon (ROC) and labile carbon pools, as well as three residual carbon sources (amino sugars, lignin phenols, and lipids) in sediments between mangroves of introduced Sonneratia apetala and native Kandelia obovata, and further connected them with microbial life strategies and C metabolism capability. The results showed that SOC accumulation in S. apetala (SA) sediment was about 30%–50% of that in K. obovata (KO) sediment. ROC was the dominant form of SOC in long-term sequestration (76%–83%), while lignin phenols, amino sugars, and lipids were important sources of ROC. In S. apetala sediments, the ROC content was positively correlated with amino sugars, resulting from the more r-strategist microbes that can rapidly convert plant-derived carbon into microbial biomass, which is subsequently transformed into microbial necromass. In contrast, in K. obovata sediments, ROC content showed a stronger positive correlation with the concentrations of lignin phenols and lipids. More K-strategist fungi in the topsoil of K. obovata increased enzyme activities, while more K-strategist bacteria in the subsoil enhanced carbon utilization capacity, thereby increasing lignin phenols and lipids from plant residues in both soil layers. Meanwhile, higher Ca2+ concentrations in K. obovata sediments protected three residual carbons from further microbe decomposition. This study provides valuable insights into the molecular mechanisms of SOC sequestration mediated by microbial life strategies in mangrove ecosystems.
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来源期刊
Forest Ecosystems
Forest Ecosystems Environmental Science-Nature and Landscape Conservation
CiteScore
7.10
自引率
4.90%
发文量
1115
审稿时长
22 days
期刊介绍: Forest Ecosystems is an open access, peer-reviewed journal publishing scientific communications from any discipline that can provide interesting contributions about the structure and dynamics of "natural" and "domesticated" forest ecosystems, and their services to people. The journal welcomes innovative science as well as application oriented work that will enhance understanding of woody plant communities. Very specific studies are welcome if they are part of a thematic series that provides some holistic perspective that is of general interest.
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