5 documents found, page 1 of 1
Variations in Amazon forest productivity correlated with foliar nutrients and m...
Mercado, Lina; Patiño, Sandra; null, Tomas; Fyllas, Nikolaos M.; Weedon, Graham P.; Sitch, Stephen A.; Quesada, Carlos Alberto; Phillips, Oliver L.The rate of above-ground woody biomass production, WP, in some western Amazon forests exceeds those in the east by a factor of 2 or more. Underlying causes may include climate, soil nutrient limitations and species composition. In this modelling paper, we explore the implications of allowing key nutrients such as N and P to constrain the photosynthesis of Amazon forests, and also we examine the relationship bet...
Age-dependent leaf physiology and consequences for crown-scale carbon uptake du...
Albert, Loren P.; Wu, Jin; Prohaska, Neill; Camargo, Plínio Barbosa de; Huxman, Travis E.; Tribuzy, Edgard Siza; Ivanov, Valeriy Yu; Oliveira, Rafael S.Satellite and tower-based metrics of forest-scale photosynthesis generally increase with dry season progression across central Amazônia, but the underlying mechanisms lack consensus. We conducted demographic surveys of leaf age composition, and measured the age dependence of leaf physiology in broadleaf canopy trees of abundant species at a central eastern Amazon site. Using a novel leaf-to-branch scaling appro...
Biological processes dominate seasonality of remotely sensed canopy greenness i...
Wu, Jin; Kobayashi, Hideki; Stark, Scott C.; Meng, Ran; Guan, Kaiyu; Tran, Ngoc Nguyen; Gao, Sicong; Yang, Wei; Restrepo-Coupé, Natalia; Miura, TomoakiSatellite observations of Amazon forests show seasonal and interannual variations, but the underlying biological processes remain debated. Here we combined radiative transfer models (RTMs) with field observations of Amazon forest leaf and canopy characteristics to test three hypotheses for satellite-observed canopy reflectance seasonality: seasonal changes in leaf area index, in canopy-surface leafless crown fr...
Leaf development and demography explain photosynthetic seasonality in Amazon ev...
Wu, Jin; Albert, Loren P.; Lopes, Aline Pontes; Restrepo-Coupé, Natalia; Hayek, Matthew N.; Wiedemann, Kenia T.; Guan, Kaiyu; Stark, Scott C.In evergreen tropical forests, the extent, magnitude, and controls on photosynthetic seasonality are poorly resolved and inadequately represented in Earth system models. Combining camera observations with ecosystem carbon dioxide fluxes at forests across rainfall gradients in Amazônia, we show that aggregate canopy phenology, not seasonality of climate drivers, is the primary cause of photosynthetic seasonality...
Optimum air temperature for tropical forest photosynthesis: Mechanisms involved...
Tan, Zhenghong; Zeng, Jiye; Zhang, Yongjiang; Slot, Martijn; Gamo, Minoru; Hirano, Takashi; Kosugi, Yoshiko; Rocha, Humberto Ribeiro da