Good news! It has been reported many times before that extra CO2 is greening the planet and thereby also reducing CO2 in the atmosphere! Here is more evidence!
CO2 is much maligned life essential trace gas! The greenhouse gas theory is very convenient, but seriously flawed!
Conclusion: Plant more trees if you are concerned with CO2 increase!
"... This is good news, as more efficient tropical forests can absorb more CO2, helping to slow down climate change. This finding comes from a new research method that allows scientists to analyze the effects of CO2 up to 100 years into the past.
For the study, scientists collected wood samples from red cedar trees in Australia, Thailand, and Bangladesh using a hollow drill. This drill extracts a cylindrical piece of wood from the tree, revealing its tree rings. ..."
"... for the past century, the extra CO₂ has led to more efficient photosynthesis in tropical trees. This is good news, as more efficient tropical forests can absorb more CO₂, helping to slow down climate change. This finding comes from a new research method that allows scientists to analyze the effects of CO₂ up to 100 years into the past. ..."
From the abstract:
"
- Tropical forests substantially influence the terrestrial carbon sink. Their contributions to the forest carbon sink may increase due to the stimulation of photosynthesis by rising atmospheric CO2 (Ca); however, the magnitude of this effect is poorly quantified for tropical canopy trees.
- We measured the ratio of two deuterium isotopomers of glucose derived from tree rings to estimate how photosynthetic efficiency (photorespiration-to-photosynthesis ratio) has responded to Ca rise at a centennial scale. Wood samples were obtained from Toona ciliata trees from three climatically distinct forests in Asia and Australia. We applied Bayesian mixed effect models to test how the isotopomer ratio changes with Ca, tree diameter (as a proxy for crown exposure), temperature, and precipitation.
- Across all sites, long-term Ca rise increased photosynthetic efficiency, likely due to increased photosynthesis and the concurrent suppression of photorespiration. Increasing tree size reduced photosynthetic efficiency, likely due to reduced leaf internal CO2 at higher irradiance and stronger hydraulic limitation. Associations of photosynthetic efficiency with temperature and precipitation were inconclusive.
- Our study reveals a centennial-scale association between photosynthetic efficiency and increasing Ca in canopy trees and provides a new and independent line of evidence for Ca-induced stimulation of photosynthetic efficiency in tropical forests.
"
No comments:
Post a Comment