Understorey productivity in temperate grassy woodland responds to soil water availability but not to elevated [CO2]
Data de publicació2018-05-15
Bradstock, Ross A.
Duursma, Remko A.
Boer, Matthias M.
MetadadesMostra el registre d'unitat complet
Rising atmospheric [CO2] and associated climate change are expected to modify primary productivity across a range of ecosystems globally. Increasing aridity is predicted to reduce grassland productivity, although rising [CO2] and associated increases in plant water use efficiency may partially offset the effect of drying on growth. Difficulties arise in predicting the direction and magnitude of future changes in ecosystem productivity, due to limited field experimentation investigating climate and CO2 interactions. We use repeat near‐surface digital photography to quantify the effects of water availability and experimentally manipulated elevated [CO2] (eCO2) on understorey live foliage cover and biomass over three growing seasons in a temperate grassy woodland in south‐eastern Australia. We hypothesised that (i) understorey herbaceous productivity is dependent upon soil water availability, and (ii) that eCO2 will increase productivity, with greatest stimulation occurring under conditions of low water availability. Soil volumetric water content (VWC) determined foliage cover and growth rates over the length of the growing season (August to March), with low VWC (<0.1 m3 m−3) reducing productivity. However, eCO2 did not increase herbaceous cover and biomass over the duration of the experiment, or mitigate the effects of low water availability on understorey growth rates and cover. Our findings suggest that projected increases in aridity in temperate woodlands are likely to lead to reduced understorey productivity, with little scope for eCO2 to offset these changes.
És part deGlobal Change Biology, 2018, vol. 24, núm. 6, p. 2366-2376
Projectes de recerca europeus
Mostrant elements relacionats per títol, autor i matèria.
Nolan, Rachael H.; Blackman, Chris J.; Resco de Dios, Víctor; Choat, Brendan; Medlyn, Belinda E.; Li, Ximeng; Bradstock, Ross A.; Boer, Matthias M. (MDPI, 2020-07-20)Globally, fire regimes are being altered by changing climatic conditions. New fire regimes have the potential to drive species extinctions and cause ecosystem state changes, with a range of consequences for ecosystem ...
Globe-LFMC, a global plant water status database for vegetation ecophysiology and wildfire applications Yebra, Marta; Scortechini, Gianluca; Badi, Abdulbaset; Beget, María Eugenia; Boer, Matthias M.; Bradstock, Ross A.; Chuvieco Salinero, Emilio; Danson, F. Mark; Dennison, Philip; Resco de Dios, Víctor; Di Bella, Carlos M.; Forsyth, Greg; Frost, Philip; García, Mariano; Hamdi, Abdelaziz; He, Binbin; Jolly, Matt; Kraaij, Tineke; Martín, M. Pilar; Mouillot, Florent; Newnham, Glenn; Nolan, Rachael H.; Pellizzaro, G.; Qi, Yi; Quan, Xingwen; Riaño, David; Roberts, Dar; Sow, Momadou; Ustin, Susan (Springer Nature, 2019-08-21)Globe-LFMC is an extensive global database of live fuel moisture content (LFMC) measured from 1,383 sampling sites in 11 countries: Argentina, Australia, China, France, Italy, Senegal, Spain, South Africa, Tunisia, United ...
Upside-down fluxes Down Under: CO2 net sink in winter and net source in summer in a temperate evergreen broadleaf forest Renchon, Alexandre A.; Griebel, Anne; Metzen, Daniel; Williams, Christopher A.; Medlyn, Belinda E.; Duursma, Remko A.; Barton, Craig V. M.; Maier, Chelsea; Boer, Matthias M.; Isaac, Peter; Tissue, David T.; Resco de Dios, Víctor; Pendall, Elise (Copernicus Publications on behalf of the European Geosciences Union, 2018)Predicting the seasonal dynamics of ecosystem carbon fluxes is challenging in broadleaved evergreen forests because of their moderate climates and subtle changes in canopy phenology. We assessed the climatic and biotic ...