Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s10584-018-2227-x |
Variability in precipitation seasonality limits grassland biomass responses to rising CO2: historical and projected climate analyses | |
Hovenden, Mark J.1; Newton, Paul C. D.2 | |
2018-07-01 | |
发表期刊 | CLIMATIC CHANGE
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ISSN | 0165-0009 |
EISSN | 1573-1480 |
出版年 | 2018 |
卷号 | 149期号:2页码:219-231 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; New Zealand |
英文摘要 | Correctly estimating the effect of elevated CO2 (eCO(2)) on biomass production is paramount for accurately projecting agricultural productivity, global carbon balances and climate changes. Plant physiology suggests that eCO(2) should result in a strongly positive CO2 fertilisation effect (CFE) via positive effects on photosynthesis and water use efficiency. However, the CFE in CO2 experiments is often constrained because of other factors of which rainfall pattern is particularly important. Here, we apply a generally applicable, empirically derived relationship between the CFE and an index of seasonal rainfall balance (SRB), to identify how historical and projected future rainfall patterns modify the CFE using 25 native grassland sites in south-eastern (SE) Australia as a test case. We found that historical and projected rainfall produced SRBs that varied widely from year-to-year resulting in a CFE that was only positive in about 40% of years, with no or even negative biomass responses in the remainder of years; a finding that is in marked contrast to other studies that have not taken account of relationships between rainfall seasonality and plant responses to CO2. The dependence of the CFE on SRB also means that using the CFE from a specific eCO(2) experiment can be misleading as the result will be heavily influenced by the SRB during the period of experimentation but this problem can be avoided by using a robust general relationship of the kind used in this study. Generalisations of grassland biomass responses to the rising CO2 concentration are contextual in terms of the variability in precipitation seasonality; as such, this provides a new lens by which to view aboveground responses to the rising CO2 concentration and fosters a novel approach for cross-site comparisons among experiments. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439940200008 |
WOS关键词 | ALTERS SPECIES COMPOSITION ; ELEVATED ATMOSPHERIC CO2 ; ENRICHMENT FACE ; CARBON-DIOXIDE ; ECOSYSTEM RESPONSE ; SHORTGRASS STEPPE ; WATER RELATIONS ; CHANGE IMPACTS ; NITROGEN ; PRODUCTIVITY |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/30018 |
专题 | 气候变化 |
作者单位 | 1.Univ Tasmania, Sch Nat Sci, Biol Sci, Private Bag 55, Hobart, Tas 7001, Australia; 2.AgResearch, Plant Funct Biol, Tennent Dr,Private Bag 11008, Palmerston North 4442, New Zealand |
推荐引用方式 GB/T 7714 | Hovenden, Mark J.,Newton, Paul C. D.. Variability in precipitation seasonality limits grassland biomass responses to rising CO2: historical and projected climate analyses[J]. CLIMATIC CHANGE,2018,149(2):219-231. |
APA | Hovenden, Mark J.,&Newton, Paul C. D..(2018).Variability in precipitation seasonality limits grassland biomass responses to rising CO2: historical and projected climate analyses.CLIMATIC CHANGE,149(2),219-231. |
MLA | Hovenden, Mark J.,et al."Variability in precipitation seasonality limits grassland biomass responses to rising CO2: historical and projected climate analyses".CLIMATIC CHANGE 149.2(2018):219-231. |
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