Intertidal zonation of mangrove organic carbon fractions driven by vegetation biomass and soil nutrient levels

作者：Xiaolei Yin, Weiqi Wang, Yuanchun Zou, Zhaoliang Song, Jordi Sardans, Martin Wiesmeier, Georg Guggenberger, Qiang Li, Ji Chen, Josep Peñuelas · 发表于：CATENA · 年份：2025 · DOI：10.1016/j.catena.2025.108722 · 被引用次数：7 · 研究领域：Coastal wetland ecosystem dynamics

• We studied soil organic carbon fractions in mangroves along sea-continent gradient. • SOC, EOC and DOC in intertidal mangrove soils decreased from Landward-Zone (LW) to Seaward-Zone (SW). • Vegetation biomass was a key factor affecting SOC, EOC and DOC concentrations. • Above/belowground biomass and soil TN and TP increased with the distance from the sea. • Results strongly suggest that sea level rise may cause great loss of mangrove SOC. High net primary production and low soil organic carbon (SOC) decomposition rates ensure that mangroves are important carbon sink likely to be disturbed by rising sea level. The differences in environmental factors along land-sea gradients in mangrove forests influence SOC characteristics. Six typical intertidal zones of mangrove distribution in the subtropical and tropical regions of China were selected for this study. Each intertidal zone was divided into three sections, ranging from land to sea: the landward zone (LW), the middle zone (MZ), and the seaward zone (SW). This classification aimed to investigate the distribution of key driving factors influencing mangrove wetland SOC and its various fractions SOC and its different fractions. The average SOC content ranged between 15.85 and 37.08 g kg −1 , and was 31 % and 57 % lower in MZ and SW than LW, respectively. Compared with LW, easily oxidizable-carbon (EOC) content in MZ and SW was 16 % and 58 % lower, and dissolved organic-carbon (DOC) content was 46 % and 67 % lower, respectively....