Tom, (I hope this gets interest and comments from numerous readers interested in biochar and methane.)
I follow your presentation. I would dissect it a little:
1. Seek to obtain better statements of the damage of methane at several time levels:
A. 100 years (because that seems to be documented. What is the 100-year CO2 equivalence of methane?)
B. 20 years (also understood. What is the 20-year CO2 equivalence of methane? And also what methods cut it’s impact off at 20 yrs instead of just running on to 100 years)?
C. 5 years (what amount of damage / impact? and what could cut it off at 5 years – prevent from going to 20 or 100 years?)
D. 1 year (Same two questions: what amount of damage / impact? and what could cut it off at 5 years – prevent from going to 20 or 100 years?)
E. 2 months (Same first question: what amount of damage / impact; But the second question (what could do the job of stopping methane at 2 months) becomes a research topic about the impact of biochar into manure or other methane sources. )
F. Zero months: (What WOULD have been the damage IF the methane had been released? And the second question is how much methane reduction can occur from proper feeding of biochar to cattle?)
2. Concerning the quick capture (such as 2 months) or the avoidance of production (zero months) of methane, do we have quality data about how much methane can be “intercepted” at the different time levels? And what is the ultimate outcome regarding the methane: such as delayed release, or “the bacteria ate it” or something else?
3. Combine 1 and 2 and make some clear statements (or clear research hypotheses). Main question is: What is the quantitative value of biochar (in CO2e units) when it is targeting methane in different scenarios of usage?
4. I suggest that there be no references to NOx because it leads to overload and sidetracking of the discussion. If necessary, let NOx have its own discussion regarding biochar.
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Look at Chapter 8 of an Ebook cited in attached excerpt dealing with biochar impact on changes in soil organic carbon
In summary, meta-studies found a mean 3.8% per year increase in SOC but values included 0 within 95% confidence range. Longer-term studies show a 15% SOC increase with BC, but the results depend on the BC characteristics and soil, so more research is needed.
Everyone should be aware that the portion of this chapter dealing with the impact on climate change notes the impact of biochar on reducing CH4 and N20 emissions, but uses the 100-year CO2 equivalence, which seriously understates the reduction of near-term radiative forcing. Studies show BC addition to compost and to manure reduces CH4 emissions, but use of 100-year CO2 equivalence of 25 understates the impact of reduced CH4 by 70% versus 10-year CO2 e. This is because CH4 has a life of 12 years while CO2 takes 330 years to drop to 20% of emissions and thousands of years to completely disappear. The 100-year CO2 e of methane is 25, while the IPCC 10-year equivalence is 91. N20, which lives 150 years, is roughly the same with a 100-yr e of 298 and 10-year e of 275. Bottom line: correctly made biochar added to compost or manure has a major impact on radiative forcing.
Thomas R Casten
did anyone attempt at "weighing" the bacteria and fungi that can grow on biochar ?
for any kg / pound of biochar added to the soil how much organic matter in the form of bacteria and fungi can we expect ?
can anyone guesstimate % of biomass weight that we can add to biochar by biocharging it with compost tea or similar approaches ?
did some google scholar searching but I guess I did not use the right keywords