红树林湿地沉积速率对于气候变化的响应

发布时间：2017-12-27 10:37

本文关键词：红树林湿地沉积速率对于气候变化的响应　出处：《热带海洋学报》2017年02期 　论文类型：期刊论文

【摘要】：红树林湿地对维持热带-亚热带地区海岸带生态平衡具有重要作用,并在全球碳循环中扮演重要角色。以广西北海市红树林湿地作为研究对象,对该地区两处湿地钻孔沉积物的粒度、沉积速率进行了综合研究,并结合当地近30余年的降雨量和台风登陆频率的变化特征,分析了红树林沉积物中风暴沉积的粒度组分、含量以及影响风暴沉积输入量的主要因素以及红树林沉积速率对于气候变化的响应特征。研究表明:1)正常天气状况下由潮流输入的泥沙粒级均为粉砂-黏土组分,红树林沉积中的砂粒级组分为台风期间的暴风浪输入。风暴沉积在南流江口红树林沉积物中所占的比重超过56%,在大冠沙红树林沉积物中所占比重超过73%。2)近30年来,两处红树林湿地的沉积速率对于台风登陆频率增加有明显正响应,而对降雨量变化则无明显响应。3)在径流来沙量较少的大冠沙红树林湿地,由于岸线开敞、潮间带和红树林带宽度较小,导致台风期间暴风浪入射能量较强,风暴沉积输入量较高,其沉积速率反而高于径流来沙量充足的河口区。
[Abstract]:Mangrove wetlands play an important role in maintaining the ecological balance of the tropical and subtropical coastal zones, and play an important role in the global carbon cycle. Beihai city in Guangxi mangrove wetland as the research object, the area of two wetlands drilling sediment grain size and deposition rate were studied comprehensively. The variation characteristics of rainfall and typhoon and combined with the local nearly 30 years of landing frequency, analysis of grain size in mangrove sediments deposited into the storm, and the main factors affecting the content of storm sedimentary input the amount and the deposition rate of Mangrove in response to climate change characteristics. The research shows that: 1) under normal weather conditions, the sand and particle fractions are all silty clay components, and the sand grade components in mangrove sediments are storm waves during typhoon season. The proportion of the storm deposits in the mangrove sediments of the South River estuary is more than 56%, and the proportion of the sediment in the mangrove sediments of the big crowns is more than 73%. 2) in the last 30 years, the deposition rate of two mangrove wetlands has an obvious positive response to the increasing frequency of typhoon landing, but there is no obvious response to the change of rainfall. 3) in the large crown sand mangrove wetland with less runoff and sediment, due to the open shoreline, the intertidal zone and the width of mangrove zone, the energy of storm surge is stronger, and the storm deposition input is higher. The deposition rate is higher than that of the estuarine area with enough runoff and sediment.
【作者单位】：广西南海珊瑚礁研究重点实验室;广西红树林研究中心;广西大学海洋学院;广西大学土木建筑工程学院;
【基金】：国家自然科学基金项目(41306075) 广西自然科学基金项目(2014GXNSFBA118222) 广西科学院基本业务经费项目(12YJ25HS16)~~
【分类号】：P736.21;P467
【正文快照】： Foundation item:National Natural Science Foundation(41306075);Natural Science Foundation of Guangxi(2014GXNSFBA118222);FundamentalResearch Funds of the Guangxi Academy of Sciences(12YJ25HS16)红树林湿地广泛分布在热带、亚热带的河口海岸地区,而红树林植物群落

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