Scaling foliar respiration in two contrasting forest canopies

摘要: Summary 1. The responses of night-time dark respiration ( R d ) to temperature and leaf characteristics were measured through the canopies tree species from two distinct forests ‐ an oak-dominated deciduous forest in north-eastern USA, a conifer-dominated temperate rainforest New Zealand. These chosen examine extent which canopy level changes can be applied across biomes, appropriateness scaling rules calculations whole-canopy carbon efflux. 2. response differed significantly between with height canopy. This involved both at reference temperature, increased (described by energy activation, E o , or change over 10 ° C range, Q ). ranged 25 (lowercanopy leaves) 53·8 kJ mol - 1 K (upper-canopy forest, 24‐37 site. 3. Relationships respiratory indicated that instantaneous rate covaries soluble sugar concentration nitrogen, but appears driven N. 4. Scaling loss simplifying assumptions regarding variation its tend underestimate if are based on lower-canopy physiology, overestimate upper-canopy physiology. Thus, canopy-level differences should considered modelling efforts attempting estimate wholecanopy respiration.