Understorey productivity in temperate grassy woodland responds to soil water availability but not to elevated [CO2

Global Change Biology
Luke CollinsMatthias M Boer

Abstract

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 incr...Continue Reading

References

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Citations

Mar 24, 2018·Global Change Biology·Teresa E GimenoDavid S Ellsworth
Apr 10, 2020·Nature·Mingkai JiangDavid S Ellsworth

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