Arid
DOI10.1007/s00442-003-1331-3
Productivity responses to altered rainfall patterns in a C-4-dominated grassland
Fay, PA; Carlisle, JD; Knapp, AK; Blair, JM; Collins, SL
通讯作者Fay, PA
来源期刊OECOLOGIA
ISSN0029-8549
出版年2003
卷号137期号:2页码:245-251
英文摘要

Rainfall variability is a key driver of ecosystem structure and function in grasslands worldwide. Changes in rainfall patterns predicted by global climate models for the central United States are expected to cause lower and increasingly variable soil water availability, which may impact net primary production and plant species composition in native Great Plains grasslands. We experimentally altered the timing and quantity of growing season rainfall inputs by lengthening inter-rainfall dry intervals by 50%, reducing rainfall quantities by 30%, or both, compared to the ambient rainfall regime in a native tallgrass prairie ecosystem in northeastern Kansas. Over three growing seasons, increased rainfall variability caused by altered rainfall timing with no change in total rainfall quantity led to lower and more variable soil water content (0-30 cm depth), a similar to10% reduction in aboveground net primary productivity (ANPP), increased root to shoot ratios, and greater canopy photon flux density at 30 cm above the soil surface. Lower total ANPP primarily resulted from reduced growth, biomass and flowering of subdominant warm-season C-4 grasses while productivity of the dominant C-4 grass Andropogon gerardii was relatively unresponsive. In general, vegetation responses to increased soil water content variability were at least equal to those caused by imposing a 30% reduction in rainfall quantity without altering the timing of rainfall inputs. Reduced ANPP most likely resulted from direct effects of soil moisture deficits on root activity, plant water status, and photosynthesis. Altered rainfall regimes are likely to be an important element of climate change scenarios in this grassland, and the nature of interactions with other climate change elements remains a significant challenge for predicting ecosystem responses to climate change.


英文关键词climate change Konza Prairie net primary productivity precipitation soil moisture
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000185602300011
WOS关键词TALLGRASS PRAIRIE ; ANDROPOGON-GERARDII ; MESIC GRASSLAND ; WATER RELATIONS ; UNITED-STATES ; DESERT SHRUBS ; ROOT-GROWTH ; SOIL-WATER ; GRASSES ; PRECIPITATION
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/145543
作者单位(1)Kansas State Univ, Dept Biol, Manhattan, KS 66506 USA
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GB/T 7714
Fay, PA,Carlisle, JD,Knapp, AK,et al. Productivity responses to altered rainfall patterns in a C-4-dominated grassland[J],2003,137(2):245-251.
APA Fay, PA,Carlisle, JD,Knapp, AK,Blair, JM,&Collins, SL.(2003).Productivity responses to altered rainfall patterns in a C-4-dominated grassland.OECOLOGIA,137(2),245-251.
MLA Fay, PA,et al."Productivity responses to altered rainfall patterns in a C-4-dominated grassland".OECOLOGIA 137.2(2003):245-251.
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