Environmental control of carbon allocation matters for modelling forest growth.

نویسندگان

  • Joannès Guillemot
  • Christophe Francois
  • Gabriel Hmimina
  • Eric Dufrêne
  • Nicolas K Martin-StPaul
  • Kamel Soudani
  • Guillaume Marie
  • Jean-Marc Ourcival
  • Nicolas Delpierre
چکیده

We aimed to evaluate the importance of modulations of within-tree carbon (C) allocation by water and low-temperature stress for the prediction of annual forest growth with a process-based model. A new C allocation scheme was implemented in the CASTANEA model that accounts for lagged and direct environmental controls of C allocation. Different approaches (static vs dynamic) to modelling C allocation were then compared in a model-data fusion procedure, using satellite-derived leaf production estimates and biometric measurements at c. 104 sites. The modelling of the environmental control of C allocation significantly improved the ability of CASTANEA to predict the spatial and year-to-year variability of aboveground forest growth along regional gradients. A significant effect of the previous year's water stress on the C allocation to leaves and wood was reported. Our results also are consistent with a prominent role of the environmental modulation of sink demand in the wood growth of the studied species. Data available at large scales can inform forest models about the processes driving annual and seasonal C allocation. Our results call for a greater consideration of C allocation drivers, especially sink-demand fluctuations, for the simulations of current and future forest productivity with process-based models.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The dynamic of the annual carbon allocation to wood in European tree species is consistent with a combined source–sink limitation of growth: implications for modelling

The extent to which wood growth is limited by carbon (C) supply (i.e. source control) or by cambial activity (i.e. sink control) will strongly determine the responses of trees to global changes. Nevertheless, the physiological processes that are responsible for limiting forest growth are still a matter of debate. The aim of this study was to evaluate the key determinants of the annual C allocat...

متن کامل

Interactive comment on “Modelling the climatic drivers determining photosynthesis and carbon allocation in evergreen Mediterranean forests

General comment The paper of Gea-Izquierdo et al. is an interesting exercise of calibrating a process-based model to forecast uptake and allocation of carbon by using a combination of eddy covariance CO2 flux data, dendrochronological time series of secondary growth and forest inventory data as raw data. I recognize process-based models are very complex, and of difficult implementation because ...

متن کامل

Interactive comment on “Modelling the climatic drivers determining photosynthesis and carbon allocation in evergreen Mediterranean forests

Gea-Izquierdo et al. present a landscape-scale biogeochemical model for the exchange of carbon over forest ecosystems. They describe adaptations to the basic model formulation to try and better represent the assimilation of carbon and its allocation within the tree. Key aspects of their formulation are the incorporation of nonstructural carbohydrate storage and the medium-term acclimation of ph...

متن کامل

Some New Formalisms for Modelling the Interactions between Plant Architecture, Competition and Carbon Allocation 4th Workshop on Individual-based Structural and Functional Models Some New Formalisms for Modelling the Interactions between Plant Architecture, Competition and Carbon Allocation

Dynamical simulation models of tree growth and morphology were developed to address questions about the interrelations between tree structure, functions and environmental conditions on a mesoscale level. The modelling approach has a formal basis in stochastic growth grammars (i.e., extended L-systems), which can be interpreted by the software GROGRA (Growth Grammar Interpreter) yielding time se...

متن کامل

Aboveground Tree Growth Varies with Belowground Carbon Allocation in a Tropical Rainforest Environment

Young secondary forests and plantations in the moist tropics often have rapid rates of biomass accumulation and thus sequester large amounts of carbon. Here, we compare results from mature forest and nearby 15-20 year old tree plantations in lowland Costa Rica to evaluate differences in allocation of carbon to aboveground production and root systems. We found that the tree plantations, which ha...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • The New phytologist

دوره 214 1  شماره 

صفحات  -

تاریخ انتشار 2017