摘要
滩涂造林是修复红树林湿地和提升海岸带蓝碳生态系统碳汇功能的重要手段。为揭示修复初期红树林湿地生物量和碳储量分布特征及影响因素,以广东省海丰县长沙湾入海口种植初期(红树林种植3~5年)人工拉关木群落作为研究对象,调查不同林龄、不同区段(近陆地、过渡、近海洋)红树植物群落特征,采集0~100 cm土壤柱状样品,比较分析不同林龄不同区段拉关木群落生长状况、生物量累积及各器官生物量分配特征,土壤碳储量水平和垂直空间分布规律及其与土壤因子间相关性。结果表明,由陆向海随潮位高度降低拉关木群落生长状况逐步变差。近陆地段拉关木通过抑制幼苗萌发生长(RSD为-6879株·hm^(-2)·yr^(-1))、快速提高初始栽植植株胸径(R_(DBH)为8.4 mm·yr^(-1))的方式累积生物量。近海洋段拉关木通过提高幼苗繁殖体数量(RSD为6784株·hm^(-2)·yr^(-1)),维持种群稳定和生物量累积。由海向陆拉关木树干生物量年均增速占比由26.58%增加至41.91%,用于强化种内竞争优势。由陆向海拉关木根系、叶片生物量年均增速占比分别从32.93%、5.69%增至40.15%、16.16%,用于增加风浪抵抗力和存活率。受修复初期幼龄红树植物生长代谢较慢影响,土壤碳储量受植株生长的影响较少,土壤碳密度在水平方向上变化不大,均值为81.42±3.79 t·hm^(-1),但在垂直分布上呈逐渐降低趋势,其受土壤容重、有机碳的质量分数、含水率、氮、磷等土壤理化性质影响较大。伴随红树林恢复进程的增加,植株生长对红树林生物量和土壤碳储量的影响将会逐渐增加。
Mudflat afforestation is an important measure to restore mangrove wetlands and improve blue carbon function in the coastal zone.Yet,the biomass,soil carbon sink capacity and influence of factors for the early stage of artificial mangroves still remain unclear.In this study,the artificially Laguncularia racemosa communities(planted for 3-5 years)in the estuary of Changsha Bay,Haifeng,Guangdong Province,was selected.The characteristics of mangrove communities in different forest ages and sections(near-land,transitional,and near-sea)was investigated and soil core samples from 0 to 100 cm in depth was collected.The growth status,biomass accumulation,and allocation characteristics of different organs of Laguncularia racemosa communities in different forest ages and sections,as well as the horizontal and vertical distribution patterns of soil carbon storage and their influencing factors were analyzed.The results showed that the growth status of Laguncularia racemosa communities deteriorated gradually with decreasing tidal height from land to sea.In the near-land section,Laguncularia racemosa accumulated biomass by inhibiting seedling emergence with RSD of-6879 plants·hm^(-2)·yr^(-1)and rapidly increasing the diameter at breast height of initially planted trees with R_(DBH)of 8.4 mm·yr^(-1).In the near-sea section,Laguncularia racemosa maintained population stability and biomass accumulation by increasing the number of seedling propagules with RSD of 6784 plants·hm^(-2)·yr^(-1)0.The proportion of annual increase in stem biomass of Laguncularia racemosa from sea to land increased from 26.58%to 41.91%,which enhanced intraspecific competitive advantage.The proportions of annual increase in root and leaf biomass of Laguncularia racemosa from land to sea increased from 32.93%and 5.69%to 40.15%and 16.16%,respectively,which increased resistance to wind and waves and survival rate.Due to the slow growth and metabolism of young mangrove plants at the early stage of restoration,soil carbon storage was less influenced by plant growth.The soil organic carbon density showed little variation horizontally,with an average value of 81.42±3.79 t·hm^(-2),but decreased gradually with depth.It was significantly influenced by soil bulk density,organic carbon mass fraction,moisture content,nitrogen,phosphorus,and other soil physicochemical properties.As the increase of mangrove restoration process,the influence of plant growth on mangrove biomass and soil carbon storage will gradually increase.
作者
李佳鸿
马姣娇
高常军
曾炜竣
鲍锟山
熊红
LI Jiahong;MA Jiaojiao;GAO Changjun;ZENG Weijun;BAO Kunshan;XIONG Hong(Guangdong Academy of Forestry,Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization,Guangzhou 510520,China;Guangdong Haifeng Wetland Ecosystem National Positioning Observation and Research Station,Guangzhou 510520,China;Guangdong Haifeng Birds Provincial Nature Reserve,Shanwei 516400,China;School of Geography,South China Normal University,Guangzhou 510631,China;CCCC Guangzhou Water Transport Engineering Design and Research Institute Co.,Ltd.,Guangzhou 510221,China)
出处
《华南地理学报》
2025年第3期72-84,共13页
South China Geographical Journal
基金
广东省林业科技创新项目(2021KJCX005)
广东省基础与应用基础研究基金项目(2021A1515011670)。
关键词
滩涂造林
外来红树植物
生物量分配
土壤碳储量
mudflat afforestation
exotic mangrove plants
biomass allocation
soil carbon storage
