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Assessment of Blue Carbon Storage by Baja California (Mexico) Tidal Wetlands and Evidence for Wetland Stability in the Face of Anthropogenic and Climatic Impacts

机译:下加利福尼亚州(墨西哥)潮汐湿地的蓝碳储量评估以及面对人为和气候影响的湿地稳定性的证据

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摘要

Although saline tidal wetlands cover less than a fraction of one percent of the earth’s surface (~0.01%), they efficiently sequester organic carbon due to high rates of primary production coupled with surfaces that aggrade in response to sea level rise. Here, we report on multi-decadal changes (1972–2008) in the extent of tidal marshes and mangroves, and characterize soil carbon density and source, for five regions of tidal wetlands located on Baja California’s Pacific coast. Land-cover change analysis indicates the stability of tidal wetlands relative to anthropogenic and climate change impacts over the past four decades, with most changes resulting from natural coastal processes that are unique to arid environments. The disturbance of wetland soils in this region (to a depth of 50 cm) would liberate 2.55 Tg of organic carbon (C) or 9.36 Tg CO2eq. Based on stoichiometry and carbon stable isotope ratios, the source of organic carbon in these wetland sediments is derived from a combination of wetland macrophyte, algal, and phytoplankton sources. The reconstruction of natural wetland dynamics in Baja California provides a counterpoint to the history of wetland destruction elsewhere in North America, and measurements provide new insights on the control of carbon sequestration in arid wetlands.
机译:尽管盐水潮汐湿地的覆盖面积不到地球表面的一小部分(约0.01%),但由于初级生产的高速率以及响应海平面上升而退化的表面,它们有效地隔离了有机碳。在这里,我们报告了位于下加利福尼亚州太平洋海岸的五个潮汐湿地地区的潮汐湿地和红树林的年代际变化(1972-2008年),并表征了土壤碳密度和来源。土地覆盖变化分析表明,在过去的40年中,相对于人为和气候变化影响,潮汐湿地的稳定性,其中大部分变化是干旱环境特有的自然沿海过程造成的。在该地区(深度达50厘米)的湿地土壤扰动将释放2.55 Tg有机碳(C)或9.36 Tg CO2eq。基于化学计量和碳稳定同位素比率,这些湿地沉积物中的有机碳源来自湿地大型植物,藻类和浮游植物的组合。下加利福尼亚州自然湿地动力学的重建提供了与北美其他地区湿地破坏历史的对立面,而测量结果为控制干旱湿地中的碳固存提供了新见识。

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