茳芏是我国南方滨海湿地的特色代表种,具有护堤保滩、消减污染等重要生态价值.为了在海平面上升背景下更好地开展广西钦江河口湿地保护,本研究通过卫星遥感-无人机航拍-现场调查相结合的方法,明确了钦江河口湿地茳芏的分布变化及影响机制,并根据沉积速率、径流输入、海平面上升等信息分析了未来风险及对策建议.研究表明,2011-2022 年,研究区内茳芏总面积由约0.28 km2 增加到了约0.36 km2,并呈现向海扩张的趋势.钦江河口湿地茳芏近期风险较小,但未来随着钦江径流量下降及悬浮物浓度降低,以及海平面上升,风险会逐步增加.建议定期开展海平面、滩面高程及茳芏分布区监测,并通过退养还滩、岸线修复等生态工程,为茳芏湿地应对中长期海平面上升提供缓冲空间.
Analysis on the distribution change and risk analysis of Cyperus malaccensis in Qinjiang River estuary
Cyperus malaccens is a characteristic representative species of salt marsh in southern China,it has important ecological values such as protecting beaches and coasts,reducing pollution.In order to protect the Qinjiang River estuary wetland in Guangxi Province under the background of sea level rise,this study adopt the method of combining satellite remote sensing,UAV image and on-site investigation to identify the distribution and influence mechanism of C.malaccens in Qinjiang River estuary wetland.We also analyzed the future risks of C.malaccens based on information such as sedimentation rate,runoff input,and sea level rise.The results showed that,from 2011 to 2022,the total area of C.malaccens in study area increased from 0.28 km2 to 0.36 km2,and showing a tendency to expand to the sea.In the future,with the decrease of runoff and suspended solids concentration in the Qinjiang River,and the rise of sea level,C.malaccens and the estuary wetland will face risk.Some suggestions are put forward,including regular monitoring of sea level,beach surface elevation and distribution area of C.malaccens,and provide a buffer space for C.malaccens and the estuary wetland to cope with the future sea level rise through ecological projects,such as returning aquaculture pond to beach and shoreline restoration.
Cyperus malaccensisQinjiang River estuarydistributioninfluence factorssea level risingrisk
NETL
NSTL
万方数据
