Responses of Forest Carbon Cycle to Drought and Elevated CO2
Open Access
- 4 February 2021
- journal article
- review article
- Published by MDPI AG in Atmosphere
- Vol. 12 (2), 212
- https://doi.org/10.3390/atmos12020212
Abstract
Forests play a pivotal role in mitigating global warming as an important carbon sink. Recent global greening trends reflect a positive influence of elevated atmospheric CO2 on terrestrial carbon uptake. However, increasingly frequent and intense drought events endanger the carbon sequestration function of forests. This review integrates previous studies across scales to identify potential global trends in forest responses to drought and elevated CO2 as well as to identify data needs in this important research field. The inconsistent responses of ecosystem respiration to drought contributes to the change of forest net CO2 exchange, which depends on the balance of opposite effects of warming and water stress on respiration. Whether CO2 fertilization can offset the effects of drought remains controversial, however, we found a potential overestimation of global CO2 fertilization effects because of increasing water stress and other limitations such as light and nutrients (N, P) as well as the possibility of photosynthetic acclimation.Keywords
Funding Information
- National Natural Science Foundation of China (No. 41830648)
- Fundamental Research Funds for the Central Universities (Nos. SWU116087)
- Chongqing Basic Research and Frontier Exploration Program (No. cstc2018jcyjAX0187)
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