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標題

Potential carbon storage in biochar made from logging residue: Basic principles and Southern Oregon case studies

作者

John L. Campbell, John Sessions, David Smith, Kristin Trippe

名稱(期刊/節目)

PLoS ONE

期刊期數/節目集數

13(9)

出版年月日

2018/9/13

原文摘要

The industrial production of long-lived charcoal products (commonly referred to as biochar) from otherwise shorter-lived logging resides (commonly referred to a slash) has been proposed as a means to increasing terrestrial carbon storage thus mitigating global warming caused by anthropogenic greenhouse gas emissions. We present a generalized model that describes the temporal dynamics of biochar carbon stocks, relative to carbon of unmodified logging residue, and evaluate the sensitivity of carbon storage to various biophysical and production parameters. Using this model, we then attribute net carbon storage to several potential biochar production scenarios, specifically engineered to use wood recovered from harvests prescribed to reduce fire hazard in mixed-conifer forests of South-central Oregon. Relative to a baseline scenario where logging residue is left to decay on site, the net carbon storage attributed to 20 years of biochar production is generally negative for the first several decades, then remains positive for several centuries at levels approximately one-fourth the total feedstock carbon processed. Positive net carbon storage and the time required for it to manifest is notably sensitive to biochar conversion efficiencies, logging residue decay rates, and alternate baseline fates of logging residue. The magnitude of net carbon storage, and the time required for it to become positive, is largely similar across range of production facility types. Moreover, the time required for net carbon storage to become positive, and its magnitude over the first 100 years is notably insensitive to biochar decomposition rates provided biochar decays at least ten-times slower than the logging residue it is made from.

原文摘要簡述

用來自壽命短的採運殘材(通常稱作slash)到相對長壽的炭產品產業生產(通常稱作生物炭),已被提議作為增加陸域碳儲存的方法,從而減緩因人為溫室氣體排放所導致的全球暖化。我們提出一廣義模型,其描述了生物炭碳存量的時間動態,與未變更採運殘材的碳有關,並且評估了碳儲存對各種生物物理及生產參數的敏感度。利用此模型,我們接著將淨碳儲存歸為數種潛在生物炭生產方案,其專門設計利用從規定的收成中回收的木材以減少奧勒岡中南部針葉樹混合林的火災隱患。

關鍵字

biochar, carbon storage, logging residue, biophysical parameters

連結

https://doi.org/10.1371/journal.pone.0203475

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