DOI: 10.1111/gcb.14038
Scopus记录号: 2-s2.0-85042044084
论文题名: Understorey productivity in temperate grassy woodland responds to soil water availability but not to elevated [CO2]
作者: Collins L. ; Bradstock R.A. ; Resco de Dios V. ; Duursma R.A. ; Velasco S. ; Boer M.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 6 起始页码: 2366
结束页码: 2376
语种: 英语
英文关键词: drought
; free air CO2 enrichment
; phenocam
; phenology
; stereo camera
Scopus关键词: biomass
; carbon dioxide
; drought
; foliage
; grass
; phenology
; photography
; soil water
; temperate environment
; understory
; water availability
; woodland
; Australia
英文摘要: 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 m3m−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. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110380
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia; Centre for Environmental Risk Management of Bushfires, University of Wollongong, Wollongong, NSW, Australia; Department of Crop and Forest Sciences and AGROTECNIO Center, Universitat de Lleida, Lleida, Spain; Department of Ecology, Environment & Evolution, La Trobe University, Bundoora, VIC, Australia; Department of Environment, Land, Water and Planning, Arthur Rylah Institute for Environmental Research, Heidelberg, VIC, Australia
Recommended Citation:
Collins L.,Bradstock R.A.,Resco de Dios V.,et al. Understorey productivity in temperate grassy woodland responds to soil water availability but not to elevated [CO2][J]. Global Change Biology,2018-01-01,24(6)