Rising dissolved organic carbon concentrations in coastal waters of northwestern Borneo related to tropical peatland conversion.

Rising dissolved organic carbon concentrations in coastal waters of northwestern Borneo related to tropical peatland conversion.
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DOI:
10.1126/sciadv.abi5688
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发表时间:
2022-04-15
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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东南亚的泥炭地被认为是全球海洋陆源溶解有机碳 (DOC) 的重要来源。人类干扰可能增加了泥炭地 DOC 通量,但由于缺乏监测,无法有力地证明这种区域范围的影响。在这里,我们使用来自婆罗洲西北部的卫星海洋颜色数据的时间序列显示,2002年至2021年间沿海水域的DOC浓度增加了0.31μmol升−1年−1(95%置信区间,0.18至0.44μmol升−1年−1)。我们表明,这是由于陆源 DOC 浓度增加 ≥30% 造成的,并且与 69% 的区域泥炭地面积转化为非森林土地覆盖同时发生,表明泥炭地转化大大增加了流入海洋的 DOC 通量。 DOC浓度的上升还增加了溶解有机物对水下光的吸收,这可能会通过改变水下光的可用性来影响海洋生产力。人类对热带泥炭地的干扰导致更多的溶解有机碳流入沿海海洋。
Southeast Asia’s peatlands are considered a globally important source of terrigenous dissolved organic carbon (DOC) to the ocean. Human disturbance has probably increased peatland DOC fluxes, but the lack of monitoring has precluded a robust demonstration of such a regional-scale impact. Here, we use a time series of satellite ocean color data from northwestern Borneo to show that DOC concentrations in coastal waters have increased between 2002 and 2021 by 0.31 μmol liter−1 year−1 (95% confidence interval, 0.18 to 0.44 μmol liter−1 year−1). We show that this was caused by a ≥30% increase in the concentration of terrigenous DOC and coincided with the conversion of 69% of regional peatland area to nonforest land cover, suggesting that peatland conversion has substantially increased DOC fluxes to the sea. This rise in DOC concentration has also increased the underwater light absorption by dissolved organic matter, which may affect marine productivity by altering underwater light availability. Human disturbance of tropical peatlands leads to greater fluxes of dissolved organic carbon to coastal seas.
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