生态学报2026，Vol.46Issue(4)：1787-1799,13.DOI:10.20103/j.stxb.202504210948
河南丹江湿地保护区植物生物量分配及土壤剖面有机碳含量特征
Characteristics of plant biomass allocation and soil profile organic carbon content in Danjiang wetland Reserve,Henan Province
摘要
Abstract
Wetlands are a critical component of the terrestrial carbon cycle.Investigating the variations in plant biomass and soil organic carbon(SOC)among different land-use types within typical wetland reserves can enhance the understanding of wetland carbon cycling dynamics,support China's"Carbon Peak and Carbon Neutrality"goals,and provide theoretical and practical implications for carbon management in terrestrial ecosystems.Focusing on the Danjiang wetland Reserve in Henan Province,this study examined vegetation composition,biomass allocation(above-ground,litter,below-ground),soil profile development,and SOC distribution across three land-use categories:forestland,grassland,and marshland.Results showed that:(1)Biomass allocation characteristics:The total biomass followed marshland＞grassland＞forestland(understory only),with distinct habitat-specific allocation strategies.Marshland allocated 55%to below-ground biomass,driven by reed rhizome expansion.Grassland prioritized above-ground biomass(51%),reflecting Cynodon dactylon's stem/leaf investment for pioneer colonization.Forestland accumulated 46%in litter biomass due to persistent canopy shedding and slow decomposition rates.(2)Soil profile development characteristics:The development of soil profiles was jointly regulated by vegetation,topography and hydrology.Artificial forest soils showed the greatest depth(70-80 cm)due to human improvement and root activity.Marshland soils reached 40 cm with distinct peat and gley layers(blue—gray)associated with seasonal flooding.Grassland exhibited the shallowest profile(about 30 cm),attributed to erosion and sand deposition.(3)SOC content declined with soil depth.Marshland had the highest SOC content and density,followed by forestland,then grassland.The 0-10 cm surface layer exhibited the greatest SOC concentration and spatial heterogeneity;deeper layers showed more homogenized SOC levels.(4)Grassland root biomass showed a significant positive correlation with surface SOC(P＜0.05),primarily driven by rapid shallow root turnover.Soil bulk density was negatively correlated with SOC,while moisture content was positively correlated with SOC,revealing the promoting effect of moisture conditions on carbon accumulation.This study integrates plant biomass allocation characteristics,soil profile development,and SOC content in wetland reserves to elucidate the intrinsic mechanisms of wetland carbon cycling.The findings fill crucial data gaps in regional soil development and carbon dynamics and provide a scientific basis for optimizing wetland carbon sequestration management.关键词
丹江湿地/植被类型/植物生物量/土壤剖面/土壤有机碳Key words
Danjiang wetland/vegetation type/plant biomass/soil profile/soil organic carbon引用本文复制引用
杨轩,刘渊克,韩志强,郝学峰,陆伟..河南丹江湿地保护区植物生物量分配及土壤剖面有机碳含量特征[J].生态学报,2026,46(4):1787-1799,13.基金项目
河南省自然资源"揭榜挂帅"科研项目(豫自然科研2024-8) （豫自然科研2024-8）
