| Autor: |
Peng, Jinlong, Tang, Jiwang, Xie, Shudi, Wang, Yiheng, Liao, Jiaqiang, Chen, Chen, Sun, Chuanlian, Mao, Jinhua, Zhou, Qingping, Niu, Shuli |
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| Zdroj: |
Nature Communications; 11/12/2024, Vol. 15 Issue 1, p1-8, 8p |
| Abstrakt: |
Ecosystem gross primary productivity (GPP) is the largest carbon flux between the atmosphere and biosphere and is strongly influenced by soil moisture. However, the response and acclimation of GPP to soil moisture remain poorly understood, leading to large uncertainties in characterizing the impact of soil moisture on GPP in Earth system models. Here we analyze the GPP-soil moisture response curves at 143 sites from the global FLUXNET. We find that GPP at 108 sites exhibits hump-shaped response curves with increasing soil moisture, and an apparent optimum soil moisture ( SM opt GPP , at which GPP reaches the maximum) exists widely with large variability among sites and biomes around the globe. Variation in SM opt GPP is mostly explained by local water availability, with drier ecosystems having lower SM opt GPP than wetter ecosystems, reflecting the water acclimation of SM opt GPP . This acclimation is further supported by a field experiment that only manipulates water and keeps other factors constant, which shows a downward shift in SM opt GPP after long-term water deficit, and thus a lower soil water requirement to maximize GPP. These results provide compelling evidence for the widespread SM opt GPP and its acclimation, shedding new light on understanding and predicting carbon-climate feedbacks. This study provides compelling evidence for the widespread optimum soil moisture for ecosystem photosynthesis and its acclimation to local water conditions, shedding new light on understanding and predicting carbon-climate feedbacks. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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