Contrasting Leaf Phenologies at Two Highly Seasonal Tropical Forests DOI
Natalia Restrepo‐Coupé, Bruce Nelson, Diogo Martins Rosa

и другие.

Опубликована: Янв. 1, 2024

In Amazonian tropical forests, seasonal photosynthetic activity is influenced by meteorology and leaf phenological cycles. Nevertheless, our understanding of the relationship between these drivers limited. Do all forests exhibit similar ecosystem responses to rainfall irradiance? How do soil tree-crown functional characteristics (composition lifespans emergence/abscission times) influence cycles? Here, we compared two rainforests located in central (Tapajós-K67) southern (Jaru-RJA) Amazonia that share seasonality climatic such as annual precipitation dry-season length, however different temperature, irradiance, carbon exchange We used phenocameras characterize canopy phenology, hypothesizing variations leaf-flush senescence mediated relations climate cycling. At both sites, maximum litter-fall occurred at onset wet period, while greenness peaked end -- suggesting upper-canopy allocation turnover strategies. Tapajós, (GEP) area (LAI) increased progressed, whereas Jaru, they declined. These patterns were associated with differences (1) depth, greater water storage capacity Tapajós; (2) density profiles (Tapajós exhibited a higher gap fraction, resulting larger number low-height individuals, Jaru's was concentrated closer crowns); (3) timing crown green-up, Tapajós experiencing leaf-out within few days, less synchronized flush Jaru (possibly due contrasting tree species diversity, K67 exhibiting more homogenous traits than RJA). forest level, young leaves correlated high radiation albedo. However, photosynthesis-leaf age relationships hysteresis, complicating direct regressions. Our findings contribute better how ecosystems respond importance phenology on forests' biogeochemical

Язык: Английский

A Coupled Model of Hydraulic Eco‐Physiology and Cambial Growth — Accounting for Biophysical Limitations and Phenology Improves Stem Diameter Prediction at High Temporal Resolution DOI Creative Commons
Che Liu, Mikko Peltoniemi, Pavel Alekseychik

и другие.

Plant Cell & Environment, Год журнала: 2024, Номер unknown

Опубликована: Окт. 24, 2024

ABSTRACT Traditional photosynthesis‐driven growth models have considerable uncertainties in predicting tree under changing climates, partially because sink activities are directly affected by the environment but not adequately addressed modelling. Therefore, we developed a semi‐mechanistic model coupling stomatal optimality, temperature control of enzymatic and phenology cambial growth. Parameterized using Bayesian inference measured data on Picea abies Pinus sylvestris peatland mineral soils Finland, coupled simulates transpiration assimilation rates stem radial dimension (SRD) simultaneously at 30 min resolution. The results suggest that both phenological formulations with environmental effects indispensable for capturing SRD dynamics across hourly to seasonal scales. Simulated model, was more sensitive than soil water, suggesting carbon gain is driving current temporal scale. Also, leaf‐specific production occasionally positively correlated duration onset timing or annual area increment. Thus, as it hardly explained gain, itself should be included sink‐driven trees boreal zone possibly other environments where photosynthesis restrained harsh conditions.

Язык: Английский

Процитировано

2
Contrasting Leaf Phenologies at Two Highly Seasonal Tropical Forests DOI
Natalia Restrepo‐Coupé, Bruce Nelson, Diogo Martins Rosa

и другие.

Опубликована: Янв. 1, 2024

In Amazonian tropical forests, seasonal photosynthetic activity is influenced by meteorology and leaf phenological cycles. Nevertheless, our understanding of the relationship between these drivers limited. Do all forests exhibit similar ecosystem responses to rainfall irradiance? How do soil tree-crown functional characteristics (composition lifespans emergence/abscission times) influence cycles? Here, we compared two rainforests located in central (Tapajós-K67) southern (Jaru-RJA) Amazonia that share seasonality climatic such as annual precipitation dry-season length, however different temperature, irradiance, carbon exchange We used phenocameras characterize canopy phenology, hypothesizing variations leaf-flush senescence mediated relations climate cycling. At both sites, maximum litter-fall occurred at onset wet period, while greenness peaked end -- suggesting upper-canopy allocation turnover strategies. Tapajós, (GEP) area (LAI) increased progressed, whereas Jaru, they declined. These patterns were associated with differences (1) depth, greater water storage capacity Tapajós; (2) density profiles (Tapajós exhibited a higher gap fraction, resulting larger number low-height individuals, Jaru's was concentrated closer crowns); (3) timing crown green-up, Tapajós experiencing leaf-out within few days, less synchronized flush Jaru (possibly due contrasting tree species diversity, K67 exhibiting more homogenous traits than RJA). forest level, young leaves correlated high radiation albedo. However, photosynthesis-leaf age relationships hysteresis, complicating direct regressions. Our findings contribute better how ecosystems respond importance phenology on forests' biogeochemical

Язык: Английский

Процитировано

0