Responses of Coastal Wetlands to Rising Sea-Level Revisited: The Importance of Organic Production
Responses of Coastal Wetlands to Rising Sea-Level Revisited: The Importance of Organic Production
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重新审视沿海湿地对海平面上升的反应：有机生产的重要性
DOI：
10.1007/s12237-023-01313-8
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发表时间：
2024
影响因子：
2.7
通讯作者：
Sundberg, Karen
中科院分区：
文献类型：
--
作者：
Morris, James T.;Sundberg, Karen
从1990年到1996年一直持续到2022年，在南卡罗来纳州的北入口河口，15个表面高程表（SET）的网络进行了监测，每年或每月的时间尺度。在对照地块的73个时间序列中，有12个的海拔增量等于或超过当地的海平面上升率（SLR，0.34厘米/年）。上升的沼泽海拔在北进口的有机生产为主，我们假设，是成比例的净生态系统生产。海拔增加率为0.47厘米/年的地块实验施肥10年与N&P相比，附近的控制地块已获得0.1厘米/年，在26年。在施肥地块海拔的过度收益和损失占地下生物量和营业额的变化。这是支持的生物测定实验在沼泽器官，在年龄2的地下生物量的fertizedS。alternifloraplants增加了1，994 g m-2 year-1，这为海拔增加增加了2.4 cm/年的增长溢价。这与对照组746 g m-2 year-1的地下净生长形成对比，后者可使海拔增加0.89 cm/年。施肥生物测定处理的根系生物量密度大于对照，分别稳定在约1，374 g m− 2和472 g m−2。地下生物量的增长主要是根茎，3年后施肥处理的根茎增长到3，648 g m− 2，5年后对照处理的根茎增长到1，439 g m− 2。沉积湿地受到矿物沉积物的外源供应的限制，而像北湾这样的沼泽可以被归类为自治的，因为它们依赖于原位有机生产来保持海拔。自主湿地更容易受到SLR的影响，因为它们的海拔增益最终受到光合效率的限制。
A network of 15 Surface Elevation Tables (SETs) at North Inlet estuary, South Carolina, has been monitored on annual or monthly time scales beginning from 1990 to 1996 and continuing through 2022. Of 73 time series in control plots, 12 had elevation gains equal to or exceeding the local rate of sea-level rise (SLR, 0.34 cm/year). Rising marsh elevation in North Inlet is dominated by organic production and, we hypothesize, is proportional to net ecosystem production. The rate of elevation gain was 0.47 cm/year in plots experimentally fertilized for 10 years with N&P compared to nearby control plots that have gained 0.1 cm/year in 26 years. The excess gains and losses of elevation in fertilized plots were accounted for by changes in belowground biomass and turnover. This is supported by bioassay experiments in marsh organs where at age 2 the belowground biomass of fertilizedS. alternifloraplants was increasing by 1,994 g m−2year−1, which added a growth premium of 2.4 cm/year to elevation gain. This was contrasted with the net belowground growth of 746 g m−2year−1in controls, which can add 0.89 cm/year to elevation. Root biomass density was greater in the fertilized bioassay treatments than in controls, plateauing at about 1,374 g m−2and 472 g m−2, respectively. Growth of belowground biomass was dominated by rhizomes, which grew to 3,648 g m−2in the fertilized treatments after 3 years and 1,439 g m−2in the control treatments after 5 years. Depositional wetlands are limited by an exogenous supply of mineral sediment, whereas marshes like North Inlet could be classified as autonomous because they depend on in situ organic production to maintain elevation. Autonomous wetlands are more vulnerable to SLR because their elevation gains are constrained ultimately by photosynthetic efficiency.
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DOI：
--
发表时间：
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期刊：
影响因子：
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影响因子：
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作者：
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