Gas Exchange and Photosynthesis

摘要: Gas exchange and photosynthetic activity give insight into the energy balance of plants. These parameters, as well transpiration, stomatal conductance, intercellular CO2 concentrations, leaf chlorophyll nitrogen contents, are especially interesting because they can be measured directly on living organs thus make statements possible about physiological condition a trees in different hydric conditions. Photosynthetic assimilations under natural conditions Amazonian floodplains lie same range those other tropical woody Responses to waterlogging show decreases: overall means parameters higher non-flooded period most analysed species, but many also perform highest absolute values assimilation aquatic phase. Like wetland flooding floodplain species enhances water potential net photosynthesis, leading high air-vapour pressure deficits. The tree developed diversity adaptive strategies, with tight regulation carbon relations severe soil-oxygen deficiencies. This may allow them cope even drought problems permit activities during year, gives these dominance over competitors which more efficient unable compete when inundated.