华东地质2025，Vol.46Issue(4)：517-528,12.DOI:10.16788/j.hddz.32-1865/P.2025.08.006
人类活动胁迫下洛阳江河口潮滩沉积环境演变过程
Evolution of the tidal flat sedimentary environment under the stress of human activities in the Luoyangjiang Estuary
摘要
Abstract
Tidal flats,situated within the interface of terrestrial,marine,atmospheric and anthropogenic in-fluences,exhibit high sensitivity to human disturbance.However,it remains unclear how regime shifts in embay-ment-type tidal flat systems evolve under intense human activities.This study examines the driving processes of human activities on the evolution of the tidal flats in the Luoyangjiang Estuary by analyzing two sediment cores collected from different sites in the estuary.Results indicate that sediments from both the upstream and down-stream tidal flats are primarily composed of fine-grained material,mainly clayey silt,with mean grain sizes of 5.87 Φ～7.29 Φ(mean:6.85 Φ)and 5.17 Φ～7.18 Φ(mean:6.32 Φ),respectively.The average sedimentation rates for the two core samples were 2.97 cm/a and 3.94 cm/a.Following the invasion of Spartina alterniflora,the average sedimentation rate increased from 1.93 cm/a to 3.71 cm/a in the upstream tidal flat and from 1.25 cm/a to 4.58 cm/a in the downstream tidal flat.Overall,the tidal flats of the Luoyangjiang Estuary experienced stable and continuous accretion;however,large-scale land reclamation(including the construction of a sluice gate upstream in the Luoyangjiang Estuary)substantially modified sediment grain-size composition,and the rapid expansion of Spartina alterniflora further accelerated sedimentation rates.The findings of this study provide a scientific basis for future ecological conservation and restoration planning of the tidal flat ecosystem in the Luoyangjiang Estuary.关键词
潮滩/人类活动/沉积速率/互花米草/洛阳江河口Key words
tidal flat/human activities/sedimentation rate/Spartina alterniflora/Luoyangjiang Estuary分类
天文与地球科学引用本文复制引用
YE Xiang,WANG Aijun,WANG Fenfen,TAO Shuqin..人类活动胁迫下洛阳江河口潮滩沉积环境演变过程[J].华东地质,2025,46(4):517-528,12.基金项目
国家自然科学基金"闽江河口—毗邻海岸的地貌沉积互馈过程及环境演变(编号:U22A20585)"、福建省自然科学基金"互花米草清除对河口潮滩湿地冲淤和有机碳'源-汇'格局的影响研究(编号:2025J02029)"和厦门市自然科学基金"九龙江河流—河口—厦门湾连续体有机碳输运过程及其对极端事件的响应(编号:3502Z20253094)"项目联合资助. （编号:U22A20585）
