Tidal Impoundment and Mangrove Dieback at Cabbage Tree Basin, NSW: Drivers of Change and Tailored Management for the Future

IF 2.3 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
E. Asbridge, R. Clark, P. Denham, M. G. Hughes, M. James, D. Mclaughlin, C. Turner, T. Whitton, T. Wilde, K. Rogers
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引用次数: 0

Abstract

Major storms can cause significant changes to coastal and wetland environments. A series of storm events in 2020 resulted in closure of the historically open estuary at Cabbage Tree Basin, Port Hacking, New South Wales (NSW), Australia. Prolonged tidal impoundment (3 months) led to substantial changes in hydrological and sedimentological processes, resulting in widespread mangrove dieback. This study aimed to quantify the degree of impact and recovery for mangroves, identify factors contributing to dieback, and consider the implications for carbon sequestration. This was achieved using remotely piloted aircraft structure-from-motion approaches, aerial photography, and field-based assessments of vegetation health and above-ground biomass (AGB). Mangroves were classified as ‘dead’, ‘partially dead’, and ‘live’. In October 2019, there was 10.8 ha of live mangroves, with this reduced to 6.6 ha by August 2022. Digital surface models (DSMs) were intersected with classified mangroves to assess the vertical distribution of each zone. All mangroves classified as ‘dead’ were distributed at elevations < 0.4 m with respect to the Australian Height Datum (AHD), suggesting these regions were persistently inundated, which was confirmed by water level loggers (inundated during logger deployment). Field data confirmed substrate elevation related to dieback with the proportion of ‘live’ mangroves greatest at elevations > 0.6 m AHD. Substrate elevation and distance to the estuary mouth were significantly correlated with species, with Avicennia marina located at lower tidal positions and closer to the entrance compared to Aegiceras corniculatum. The dieback event equated to a loss of 81.5 ± 48 Mg of above-ground biomass, 38.1 ± 22.5 Mg C, or 140 ± 82 Mg CO2 equivalence (CO2e). This study provides an important baseline for monitoring dieback events. Continued monitoring is crucial to assess recovery and to tailor management strategies.

Abstract Image

新南威尔士州白菜树盆地的潮汐蓄水和红树林衰退:变化的驱动因素和未来的定制管理
大风暴可导致沿海和湿地环境发生重大变化。2020 年发生的一系列风暴事件导致澳大利亚新南威尔士州(NSW)哈金港白菜树盆地(Cabbage Tree Basin)历史上开放的河口关闭。长期的潮汐蓄水(3 个月)导致水文和沉积过程发生重大变化,造成红树林大面积枯死。这项研究旨在量化红树林受到的影响和恢复程度,确定导致红树林枯死的因素,并考虑对碳封存的影响。这项研究采用了遥控飞机运动结构法、航空摄影以及对植被健康和地上生物量(AGB)的实地评估。红树林被分为 "死亡"、"部分死亡 "和 "存活"。2019 年 10 月,活红树林面积为 10.8 公顷,到 2022 年 8 月将减少到 6.6 公顷。数字地表模型(DSM)与分类红树林相交,以评估每个区域的垂直分布。所有被归类为 "死亡 "的红树林都分布在相对于澳大利亚高度基准(AHD)0.4 米的海拔高度上,这表明这些区域长期处于淹没状态,水位记录仪也证实了这一点(在记录仪部署期间处于淹没状态)。实地数据证实,基质海拔与枯死有关,海拔 0.6 米处的 "活 "红树林比例最大。底质海拔高度和与河口的距离与物种有明显的相关性,与 Aegiceras corniculatum 相比,Avicennia marina 位于潮汐较低的位置,更靠近河口。枯死事件相当于损失了 81.5 ± 48 兆克地上生物量、38.1 ± 22.5 兆克碳或 140 ± 82 兆克二氧化碳当量(CO2e)。这项研究为监测枯死事件提供了一个重要基线。持续监测对于评估恢复情况和调整管理策略至关重要。
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来源期刊
Estuaries and Coasts
Estuaries and Coasts 环境科学-海洋与淡水生物学
CiteScore
5.60
自引率
11.10%
发文量
107
审稿时长
12-24 weeks
期刊介绍: Estuaries and Coasts is the journal of the Coastal and Estuarine Research Federation (CERF). Begun in 1977 as Chesapeake Science, the journal has gradually expanded its scope and circulation. Today, the journal publishes scholarly manuscripts on estuarine and near coastal ecosystems at the interface between the land and the sea where there are tidal fluctuations or sea water is diluted by fresh water. The interface is broadly defined to include estuaries and nearshore coastal waters including lagoons, wetlands, tidal fresh water, shores and beaches, but not the continental shelf. The journal covers research on physical, chemical, geological or biological processes, as well as applications to management of estuaries and coasts. The journal publishes original research findings, reviews and perspectives, techniques, comments, and management applications. Estuaries and Coasts will consider properly carried out studies that present inconclusive findings or document a failed replication of previously published work. Submissions that are primarily descriptive, strongly place-based, or only report on development of models or new methods without detailing their applications fall outside the scope of the journal.
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