Carbon sequestration of a forested wetland receiving nutrient inputs - soil, tree and greenhouse gas data

Here we describe a pilot wetland carbon project located 30 km west of New Orleans where measurements were taken in 2013 and 2018, and applied to the carbon offset methodology, “Restoration of Degraded Deltaic Wetlands of the Mississippi Delta” (“the ACR Methodology”) published by the American Carbon Registry (ACR). Baseline emissions were modeled using values derived from scientific literature. Results indicate net sequestration rate of 619,727 tons carbon dioxide equivalent (CO2e) over the 40 year project duration, which equates to 16,527 t CO2-e/yr, if wetland greenhouse gases (GHGs) are included, and 200,143 t CO2e over 40 years, or 5,003 t CO2-e/yr, if wetland greenhouse gasses were conservatively omitted. A kriging exercise was carried out that modeled the tree and soil pools, which resulted in net sequestration of 723,375 t CO2-e over 40 years (annual mean 18,084 t CO2-e/yr) with greenhouse gases, and 262,472 t CO2-e over 40 years (annual mean rate 6,560 t CO2-e/yr) if greenhouse ...本研究详述了一处位于新奥尔良以西30公里的试点湿地碳项目。该项目于2013年和2018年开展实地测量，并应用了美国碳登记处（American Carbon Registry, ACR）发布的碳抵消方法学《密西西比三角洲退化三角洲湿地修复》（下称“ACR方法学”）。基线排放量采用源自科学文献的数值进行建模。结果显示，若纳入湿地温室气体（Greenhouse Gases, GHGs）核算，该项目40年周期内的净固碳总量为619727吨二氧化碳当量（Carbon Dioxide Equivalent, CO₂e），年均固碳量达16527吨CO₂e/年；若保守剔除湿地温室气体核算，40年周期内净固碳总量为200143吨CO₂e，年均固碳量为5003吨CO₂e/年。本次研究还开展了克里金（kriging）建模分析，对树木与土壤碳库进行模拟。结果表明，纳入温室气体核算时，项目40年周期内的净固碳总量为723375吨CO₂e，年均固碳量为18084吨CO₂e/年；若剔除温室气体核算，40年周期内净固碳总量为262472吨CO₂e，年均固碳量为6560吨CO₂e/年。