School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, 230036, China.
College of Architecture and Urban Planning, Anhui Jianzhu University, Hefei, 230601, China.
Sci Rep. 2022 Aug 29;12(1):14712. doi: 10.1038/s41598-022-18260-2.
Carbon storage in wetland ecosystems is an important part of the carbon cycle of terrestrial ecosystems and provides important ecosystem services. Chaohu Wetland is a typical freshwater lake wetland in China. In this study, soil and plant samples were collected every 500 m through three sample lines of different vegetation habitats (estuarine banks, woodlands and shrub beaches) and different offshore distances, revealing the spatial distribution characteristics of soil organic carbon density (SOCD) in Chaohu wetland. The overall SOCD of Chaohu wetland was low, with different habitats ranking as Woodland > Estuary and riverside > Shrub and beach. SOCD of different offshore distances had no obvious law, and the SOCD decreased significantly with soil depth. The plant biomass was significantly higher at the woodland habitat than at other habitats. Most of soil nutrient indicators were the highest at the woodland habitat, while the estuary-riverside habitat had the highest N and P contents. Soil and plant nutrients at different offshore distances had no obvious change patterns. The contents of soil K, Ca, Mg, and N were significantly positively correlated with SOCD, but soil bulk density and pH were significantly negatively correlated with SOCD, and vegetation P content was significantly negatively correlated with SOCD. The spatial pattern of SOCD changes in this lake coastal wetland was determined by the combined effects of plant nutrients, biomass, and soil physical and chemical properties. Our results indicate Chaohu wetlands may have been experiencing serious degradation. The SOCD of Chaohu wetland is lower than that of other wetlands in China, which is mainly affected by human activities. Different offshore distances and habitat heterogeneity are the main factors affecting the soil carbon cycle of the wetland.
湿地生态系统中的碳储存是陆地生态系统碳循环的重要组成部分，提供了重要的生态系统服务。巢湖湿地是中国典型的淡水湖泊湿地。本研究通过三条不同植被生境（河口滩地、林地和灌丛沙滩）和不同离岸距离的采样线，每隔 500m 采集土壤和植物样品，揭示了巢湖湿地土壤有机碳密度（SOCD）的空间分布特征。巢湖湿地的整体 SOCD 较低，不同生境的排序为林地 > 河口和河边 > 灌丛和沙滩。不同离岸距离的 SOCD 没有明显的规律，SOCD 随土壤深度显著降低。林地生境的植物生物量明显高于其他生境。大多数土壤养分指标在林地生境中最高，而河口-河边生境中 N 和 P 含量最高。不同离岸距离的土壤和植物养分没有明显的变化模式。土壤 K、Ca、Mg 和 N 含量与 SOCD 呈显著正相关，但土壤容重和 pH 与 SOCD 呈显著负相关，植被 P 含量与 SOCD 呈显著负相关。该湖泊滨海湿地 SOCD 变化的空间格局是由植物养分、生物量和土壤理化性质的综合作用决定的。研究结果表明，巢湖湿地可能正在经历严重退化。巢湖湿地的 SOCD 低于中国其他湿地，这主要是受人类活动的影响。不同的离岸距离和生境异质性是影响湿地土壤碳循环的主要因素。
