No evidence of canopy-scale leaf thermoregulation to cool leaves below air temperature across a range of forest ecosystems.

ABSTRACT: Understanding and predicting the relationship between leaf temperature (T_leaf) and air temperature (T_air) is essential for projecting responses to a warming climate, as studies suggest that many forests are near thermal thresholds for carbon uptake. Based on leaf measurements, the limited leaf homeothermy hypothesis argues that daytime T_leaf is maintained near photosynthetic temperature optima and below damaging temperature thresholds. Specifically, leaves should cool below T_air at higher temperatures (i.e., > ∼25-30°C) leading to slopes <1 in T_leaf/T_air relationships and substantial carbon uptake when leaves are cooler than air. This hypothesis implies that climate warming will be m

SUBMITTER: Still CJ 

PROVIDER: S-EPMC9499539 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature