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首页> 外文期刊>Estuarine Coastal and Shelf Science >Vertical accretion and carbon burial rates in subtropical seagrass meadows increased following anthropogenic pressure from European colonisation
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Vertical accretion and carbon burial rates in subtropical seagrass meadows increased following anthropogenic pressure from European colonisation

机译：由于欧洲殖民地的人为压力，亚热带海草草甸的垂直吸积和碳埋藏率增加

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Seagrass meadows serve as marine carbon sinks, though rates of carbon burial and sediment accretion may vary within and among seagrass meadows due to spatial and temporal variability in sedimentary and biophysical conditions. However, few data are available to evaluate variation in carbon burial over decades to centuries, particularly in subtropical seagrass meadows. Here we assess historical trends in rates of vertical accretion and carbon burial in subtropical seagrass sediments in Moreton Bay, Australia. A total of 19 sediment cores varying in length from 22 to 205 cm were collected from six locations, including two locations where seagrass meadows occurred historically but were lost in recent decades. Cores were dated using Pb-210 and C-14. Geochronologies were modelled based on the successful Pb-210 dates for two of the locations combined with C-14 at five locations. Organic and inorganic carbon content, dry bulk density and stable carbon and nitrogen isotope composition (delta C-13(org), delta N-15) were measured throughout the cores. Sediments underlying seagrass meadows in Moreton Bay have organic carbon stored up to a depth of at least 2 m which dates to over 7000 yr BP. Across the entire time series, organic carbon burial rates averaged 19 g m(-2) yr(-1) and inorganic carbon burial rates averaged 27 g m(-2) y(-1). Overall mean rates of vertical accretion were estimated to be 0.2 cm y(-1). Rates of vertical accretion accelerated 10-fold following European colonisation which commenced in 1824, from 0.06 +/- 0.06 cm yr(-1) to 0.66 +/- 1.19 cm y(-1). Similarly, rates of organic carbon burial averaged 7.2 +/- 5.5 g m(-2) y(-1) but then increased 7-fold post-colonisation to 50.5 +/- 82.1 gm(-2) y(-1). Thus, in Moreton Bay, European settlement and associated land-use change has enhanced sediment accretion and carbon burial in seagrass sediments. (C) 2017 Elsevier Ltd. All rights reserved.
机译：海草草甸是海洋碳汇，尽管由于沉积和生物物理条件的时空变化，海草草甸内部和之中的碳埋藏和沉积物沉积速率可能会有所不同。但是，很少有数据可用来评估数十年来至数百年来碳埋藏的变化，特别是在亚热带海草草甸。在这里，我们评估了澳大利亚莫顿湾亚热带海草沉积物中垂直吸积和碳埋藏速率的历史趋势。从六个地点收集了总共19个长度在22至205厘米之间的沉积物岩心，其中包括两个历史上曾出现过海草草甸但在最近几十年中消失的地点。芯使用Pb-210和C-14标明日期。地球学是根据两个地点成功的Pb-210日期和五个地点的C-14进行建模的。测量了整个堆芯的有机碳和无机碳含量，干堆积密度以及稳定的碳和氮同位素组成（δC-13（org），δN-15）。摩尔顿湾海草草甸下的沉积物中有机碳的存储深度至少为2 m，可追溯到7000多年来。在整个时间序列中，有机碳掩埋速率平均为19 g m（-2）yr（-1），无机碳掩埋速率平均为27 g m（-2）y（-1）。垂直增生的总体平均速率估计为0.2 cm y（-1）。在1824年开始的欧洲殖民统治之后，垂直积聚的速度加快了10倍，从0.06 +/- 0.06 cm yr（-1）增至0.66 +/- 1.19 cm y（-1）。同样，有机碳掩埋的速率平均为7.2 +/- 5.5 g m（-2）y（-1），但随后定殖后的7倍增加至50.5 +/- 82.1 gm（-2）y（-1）。因此，在摩顿湾，欧洲人定居和相关的土地利用变化增加了海草沉积物中的沉积物积聚和碳埋藏。 （C）2017 Elsevier Ltd.保留所有权利。

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