Tree and crop ecophysiology in agroforestry systems


Carbon fluxes and carbon allocation in agroforestry systemsEcophysiology - photosynthesis and water use efficiency 2Determination of water fluxes and nitrogen fixation in lysimter experimentsInvestigation of light environment in Robinia stands


For a better understanding of biomass production of fast-growing trees in agroforestry systems more detailed ecophysiological informations and their annual carbon balances are required. Our research focus on the ecophysiology and stress physiology of poplars (Populus spec.), black locust (Robinia pseudoacacia), and  willows (Salix spec.) in agroforestry systems in Brandenburg. Carbon gain by photosynthesis is a predominant factor for plant growth and to estimate biomass allocation at the tree, stand and landscape level. Hence, biochemical photosynthesis models are widely used to estimate diurnal and annual carbon uptake on the leaf level and scaling up to predict carbon fluxes on the canopy level. However, biochemical parameters are often difficult to determine under field conditions, and therefore we develop an empirical photosynthesis model based on gas exchange parameters and their dependence from microclimatic parameters, which can be easily obtained in the field. For up-scaling from leaf photosynthesis to annual tree carbon balance the structure of hedgerow, which is influencing the physiological functions and interactions must be taken into account. Our specific objectives are, therefore, to developed a leaf carbon model driven by light and modulated by temperature and air humidity. The seasonal variation of CO2 uptake and release can be then modeled and up-scaled to estimate the annual carbon fluxes of sun and shade leaves. 


Outputs


Agrarholz - Schnellwachsende Bäume in der Landwirtschaft

Springer Spektrum 

Planting of trees into agricultural systems have economical benefits as they provide timber and and fuelwood and other products. In those contemporary agroforestry systems, selection of tree species and their management are more economically oriented towards an optimizing biomass production, use and harvest, especially in short-rotation systems for bioenergy. The book give an overview about biology, ecology and management of fast-growing trees in short-rotation forestry and agroforestry.

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in cooperation with 


BTU


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