文献类型：期刊文献

中文题名：红树林湿地土壤有机碳稳定性影响因素初探

英文题名：A preliminary study on the influencing factors of soil organic carbon stability in mangrove wetlands

作者：钱威[1,2] 丁新原[3] 黄幸运[4] 王蔚[1] 胡凯杰[1] 熊燕梅[1]

第一作者：钱威

机构：[1]中国林业科学研究院热带林业研究所,湿地环境保护与生态修复全国重点实验室,海南东寨港红树林湿地生态系统国家定位观测站,广东广州510520;[2]南京林业大学,江苏南京210037;[3]南方海洋科学与工程广东省实验室(湛江)红树林保护研究中心,广东湛江524000;[4]中国科学院华南植物园小良热带海岸带生态系统定位研究站,广东广州510650

年份：2025

卷号：23

期号：5

起止页码：1046-1055

中文期刊名：湿地科学

外文期刊名：Wetland Science

收录：;北大核心:【北大核心2023】；

基金：湛江市海洋青年人才创新项目(2023E0001);广东省基础与应用基础研究基金项目(2022A1515010550);广东省科技创新战略专项资金项目(2023A01023)资助。

语种：中文

中文关键词：红树林;土壤有机碳稳定性;矿化作用;机械组成;微生物残体碳;矿质结合态有机碳

外文关键词：mangroves;soil organic carbon stability;mineralization;mechanical composition;microbial residue carbon;mineral-associated organic carbon

分类号：X142

摘要：红树林是蓝碳生态系统的重要组成部分,红树林土壤有机碳稳定性对蓝碳碳汇功能起着关键作用。沿纬度梯度(福建、广东和海南),采集秋茄(Kandelia obovata)和白骨壤(Avicennia marina)两种代表性红树林群落的表层(0~20 cm)和深层(40~60 cm)土壤,在室内培养90 d,测定有机碳累计矿化率(表征有机碳稳定性),并分析有机碳稳定性与不同土壤碳组分的关系。研究结果表明,不同纬度和不同群落红树林土壤有机碳累计矿化率无显著差异,深层土壤有机碳稳定性高于表层土壤。土壤细颗粒含量与矿质结合态有机碳(MAOC)占总有机碳的比例显著正相关,而MAOC占比与累计矿化率显著负相关。MAOC占比的平均值为54.00%,而微生物残体碳(MRC)占比的平均值只有14.27%。土壤有机碳与颗粒有机碳(POC)和MAOC含量都显著正相关,但与POC含量的相关性更强。上述结果表明,红树林有机碳稳定性可能主要受土壤机械组成影响,纬度和群落的影响需要进一步研究,微生物残体碳可能不是红树林稳定性土壤有机碳(MAOC)的主要来源;不稳定的碳组分(POC)封存对红树林土壤有机碳积累起主要驱动作用。
Mangroves are a pivotal component of blue-carbon ecosystems,and the stability of soil organic carbon(SOC)in these systems exerts a critical control on their carbon-sink function.Along a latitudinal gradient from Fujian to Guangdong and Hainan,we collected surface(0–20 cm)and subsurface(40–60 cm)soils dominated by two representative mangrove species,Kandelia obovata and Avicennia marina.After 90 d of laboratory incubation,cumulative SOC mineralization(used as a proxy for SOC stability)was measured and related to different soil carbon fractions.Results showed no significant difference in cumulative SOC mineralization among latitudes or plant communities.SOC in deeper layers was more stable than in surface layers.Fine-particle content was positively correlated with the proportion of mineral-associated organic carbon(MAOC)to SOC,whereas the MAOC/SOC ratio was negatively correlated with cumulative mineralization.On average,MAOC accounted for 54.00%of SOC,whereas microbial residue carbon(MRC)represented only 14.27%.SOC was significantly correlated with both particulate organic carbon(POC)and MAOC,but the relationship was stronger for POC.These findings suggest that SOC stability in mangroves is primarily governed by soil texture,and the influence of latitude and community type requires further investigation.Microbial residue carbon is unlikely to be the main source of stable MAOC,whereas the labile POC fraction may be a key driver of SOC accumulation in mangrove soils.