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植被演替对杭州湾南岸盐沼物质循环的影响
夏添1, 陈一宁2, 高建华1, 黄思龙2
1.南京大学 地理与海洋科学学院;2.自然资源部第二海洋研究所
摘要:
本项研究选择杭州湾庵东浅滩作为研究区,选取盐沼区三个不同植被带进行柱状样的采集,通过测量沉积物的粒度、沉积速率、碳氮含量(有机碳、总碳、总氮、碳氮比)等参数,系统分析研究区盐沼湿地植被演替对盐沼物质循环产生的影响。研究结果发现不同植被覆盖下沉积物粒径差异显著,沿海向陆逐渐变细。沉积速率从海三棱藨草滩、互花米草滩、植被交错区依次递减。总碳、总氮、有机碳含量特征为互花米草滩>植被交错区>海三棱藨草滩,碳氮比介于6~9之间,有机碳以海源物质为主。通过计算,发现有机碳埋藏速率为互花米草(159 g.m-2.a-1)>海三棱藨草(140g.m-2.a-1)>植被交错区(119 g.m-2.a-1)。从整体上来看,杭州湾南岸盐沼从海三棱藨草群落向互花米草群落演替时,沉积物颗粒发生细化,沉积速率有所变化,而总碳、有机碳、总氮含量增加,盐沼有机碳埋藏速
关键词:  粒度特征  盐沼植被 碳埋藏速率
DOI:
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基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
The impact of vegetation succession on salt marsh material circulation in Southern Hangzhou Bay
Xia Tian1, Chen Yi-ning2, Gao Jian-hua1, Huang Si-long2
1.Nanjing University,School of Geography and Ocean Science;2.Second Institute of Oceanography,Ministry of Natural Resources
Abstract:
Andong Shoal,Southern Hangzhou Bay, was selected as study area of this study to collect sediment cores along three saltmarsh vegetation zones. Based on the measurements of particle size, deposition rate, carbon and nitrogen content (Total Organic Carbon(TOC), Total Carbon(TC), Total Nitrogen(TN), Carbon to Nitrogen ratio(C/N)), the impact of vegetation succession on salt marsh material circulation was systematically analyzed. The results show that the particle size within different vegetation zones was significantly different, gradually becoming finer from seaward to landward. The deposition rate decreases from the Scripus mariqueter zone, Spantina alterniflora zone to the ecotone zone. TC, TN, TOC content were characterized by an decrease from Spantina alterniflora zone to ecotone zone and then to Scripus mariqueter zone. The carbon to nitrogen ratio was found between 6 and 9, thus the organic carbon was mainly sea-sourced. The burial rate of Total Organic Carbon is estimated to decrease from Spartina alterniflora zone (159 g.m-2.a-1) to Scripus mariqueter zone (140g.m-2.a-1) and then to the ecotone zone (119 g. M-2.a-1). Overall, when the saltmarsh on the south bank of Hangzhou Bay is succeeding from Scripus mariqueter to Spartina alterniflora, the sediment particles were refined and the deposition rate was changed, whilst the TC, TOC, TC content and the rate of organic carbon burial were increased.
Key words:  Particle size  Saltmarsh  Organic Carbon Burial
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