Implications of improved representations of plant respiration in a changing climate (2017)
AuthorsHuntingford C, Atkin OK, Martinez-De La Torre A, Mercado LM, Heskel MA, Harper AB, Bloomfield KJ, O'Sullivan OS, Reich PB, Wythers KR, Butler EE, Chen M, Griffin KL, Meir P, Tjoelker MG, Turnbull MH, Sitch S, Wiltshire A, Malhi Yshow all
© 2017 The Author(s). Land-atmosphere exchanges influence atmospheric CO 2 . Emphasis has been on describing photosynthetic CO 2 uptake, but less on respiration losses. New global datasets describe upper canopy dark respiration (R d ) and temperature dependencies. This allows characterisation of baseline R d , instantaneous temperature responses and longer-term thermal acclimation effects. Here we show the global implications of these parameterisations with a global gridded land model. This model aggregates R d to whole-plant respiration R p , driven with meteorological forcings spanning uncertainty across climate change models. For pre-industrial estimates, new baseline R d increases R p and especially in the tropics. Compared to new baseline, revised instantaneous response decreases R p for mid-latitudes, while acclimation lowers this for the tropics with increases elsewhere. Under global warming, new R d estimates amplify modelled respiration increases, although partially lowered by acclimation. Future measurements will refine how R d aggregates to whole-plant respiration. Our analysis suggests R p could be around 30% higher than existing estimates.
CitationHuntingford C, Atkin O, Martinez-de la Torre A, Mercado L, Heskel M, Harper A, Bloomfield K, O'Sullivan O, Reich P, Wythers K, Butler E, Chen M, Griffin K, Meir P, Tjoelker M, Turnbull M, Sitch S, Wiltshire A, Malhi Y (2017). Implications of improved representations of plant respiration in a changing climate. Nature Communications 8:1602.
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ANZSRC Fields of Research05 - Environmental Sciences::0501 - Ecological Applications::050101 - Ecological Impacts of Climate Change
06 - Biological Sciences::0607 - Plant Biology::060705 - Plant Physiology
04 - Earth Sciences::0401 - Atmospheric Sciences