After 72 hours of exposure to biomass particulate from burning, over 30% of cultured human lung cells died.

Burning of biomass releases particulate matter air pollution that causes oxidative stress as well as severe DNA damage in human lung cells — primarily through the actions of the polycyclic aromatic hydrocarbon (PAH) known as retene.

Researchers first determined the concentration of pollutants to be used in the lab experiments designed to mimic the exposure suffered by people who live in the area of the deforestation arc. Using mathematical models, the researchers calculated the human lung’s capacity to inhale particulate matter at the height of the burning season and the percentage of pollutants that is deposited in lung cells. Based on this theoretical mass, they determined the concentration levels to be tested using cultured cells.

After 72 hours of exposure, over 30% of cultured human lung cells died.

Biomass burning in the Amazon region causes DNA damage and cell death in human lung cells


Diverse aboveground biomass for the soil organic carbon win

Now this is interesting:

“the rhizosphere priming effect was positively correlated with aboveground plant biomass, but surprisingly not with root biomass

  1. Grow diverse aboveground biomass
  2. Chop and drop
  3. Mulcho profit!

In a meta-analysis of 31 studies, researches show that the rhizosphere enhances soil organic carbon mineralization by 59%[*].

That woody species are best, then grass, then crops.

[Me: *So long as it’s fed from the above ground biomass litter.]

Sounds like C:Nhoosing Your Mulch? Think of the Fungi to me, and photosynthesise as much as you can be!

Don’t forget plant and mulch diversity in this mix, as Plant litter diversity increases microbial abundance, fungal diversity, and carbon and nitrogen cycling.

Another interesting study today suggests that soil fungal community is mainly influenced by plant community composition, distance between communities, and rainfall.

So go diverse and you can’t really lose.

Diverse ecosystems in connected communities.