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- Title
The Negative Impact of Excessive Moisture Contributes to the Seasonal Dynamics of Photosynthesis in Amazon Moist Forests.
- Authors
Chen, Ruonan; Liu, Liangyun; Liu, Xinjie
- Abstract
Photosynthesis in Amazon rainforests is essential to the carbon and water cycle on a global scale, but its seasonal dynamics remain less understood. Using clear sky satellite products combined with in situ ground observations, we investigated the seasonal dynamics of photosynthesis in this unique region as well as the contribution of moisture to these dynamics. We confirmed the unique dry season increase in photosynthesis for most parts of the study region as well as small positive photosynthetic anomalies in relatively dryer years, such as El Niño years. Taking into account the contribution of increased light and new leaf flushing in dry seasons to the seasonal dynamics of photosynthesis, we found significant negative correlations between moisture variables (especially soil moisture) and photosynthesis in Amazon rainforests, especially for humid ecosystems such as primary moist forests and for humid periods such as wet seasons. Excessive moisture contributes to the seasonal dynamics of photosynthesis by changing the value of the peak and the position of the minimum values, but this process was not well‐documented in previous studies. Our study highlights the need to consider the negative impacts of excessive moisture on photosynthesis in wet ecosystems, and further research is required to support the determination of future changes in photosynthesis in different regions. Plain Language Summary: The dynamics of photosynthesis in Amazon rainforests and their response to environmental variables is important to the global change studies. Based on observations from satellite and flux towers, we confirmed the negative correlation between photosynthesis and environmental moisture in wettest ecosystems during wet periods for the study region. Among the moisture‐related indicators mentioned in our research, soil moisture in the deep underground showed the strongest negative correlation with SIF for the study region. The negative impact of excessive moisture modifies the seasonal changes in photosynthesis, and the alleviation of it in dry seasons could make the dry season increase more significant. Our findings indicated that the moisture also contributes to the dynamics of photosynthesis in Amazon rainforests. In addition to the impact of water shortage, the negative impacts of excessive moisture on photosynthesis should also be considered for wettest ecosystems. Key Points: Photosynthetic dynamics in Amazon rainforests were captured using satellite‐based observations of solar‐induced chlorophyll fluorescenceA negative correlation between photosynthesis and moisture was found in the preserved moist forest ecosystems during the wet seasonExcessive moisture stress contributes to the seasonal dynamics of photosynthesis in the Amazon rainforests
- Subjects
SOIL moisture; PHOTOSYNTHESIS; WATER shortages; CARBON cycle; MOISTURE; SEASONS
- Publication
Earth's Future, 2022, Vol 10, Issue 1, p1
- ISSN
2328-4277
- Publication type
Article
- DOI
10.1029/2021EF002306