کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | ترجمه فارسی | نسخه تمام متن |
---|---|---|---|---|---|
8884987 | 1626600 | 2018 | 55 صفحه PDF | سفارش دهید | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vertical accretion and carbon burial rates in subtropical seagrass meadows increased following anthropogenic pressure from European colonisation
ترجمه فارسی عنوان
نرخ رسوب عمودی و دفن کربن در مراتع ساتورپیک ساحران به دلیل فشار انسانی از کلونیزاسیون اروپا افزایش می
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
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 205â¯cm were collected from six locations, including two locations where seagrass meadows occurred historically but were lost in recent decades. Cores were dated using 210Pb and 14C. Geochronologies were modelled based on the successful 210Pb dates for two of the locations combined with 14C at five locations. Organic and inorganic carbon content, dry bulk density and stable carbon and nitrogen isotope composition (δ13Corg, δ15N) were measured throughout the cores. Sediments underlying seagrass meadows in Moreton Bay have organic carbon stored up to a depth of at least 2â¯m which dates to over 7000â¯yr BP. Across the entire time series, organic carbon burial rates averaged 19â¯gâ¯mâ2 yrâ1 and inorganic carbon burial rates averaged 27â¯gâ¯mâ2 yrâ1. Overall mean rates of vertical accretion were estimated to be 0.2â¯cmâ¯yrâ1. Rates of vertical accretion accelerated 10-fold following European colonisation which commenced in 1824, from 0.06â¯Â±â¯0.06â¯cmâ¯yrâ1 to 0.66â¯Â±â¯1.19â¯cmâ¯yrâ1. Similarly, rates of organic carbon burial averaged 7.2â¯Â±â¯5.5â¯gâ¯mâ2 yrâ1 but then increased 7-fold post-colonisation to 50.5â¯Â±â¯82.1â¯gâ¯mâ2 yrâ1. Thus, in Moreton Bay, European settlement and associated land-use change has enhanced sediment accretion and carbon burial in seagrass sediments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 202, 5 March 2018, Pages 40-53
Journal: Estuarine, Coastal and Shelf Science - Volume 202, 5 March 2018, Pages 40-53
نویسندگان
Jimena Samper-Villarreal, Peter J. Mumby, Megan I. Saunders, Linda A. Barry, Atun Zawadzki, Henk Heijnis, Guia Morelli, Catherine E. Lovelock,
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