Arid
DOI10.1111/j.1365-2486.2010.02363.x
Effect of precipitation variability on net primary production and soil respiration in a Chihuahuan Desert grassland
Thomey, Michell L.1; Collins, Scott L.1; Vargas, Rodrigo2; Johnson, Jennifer E.1; Brown, Renee F.1; Natvig, Donald O.1; Friggens, Michael T.1
通讯作者Thomey, Michell L.
来源期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
出版年2011
卷号17期号:4页码:1505-1515
英文摘要

Precipitation regimes are predicted to become more variable with more extreme rainfall events punctuated by longer intervening dry periods. Water-limited ecosystems are likely to be highly responsive to altered precipitation regimes. The bucket model predicts that increased precipitation variability will reduce soil moisture stress and increase primary productivity and soil respiration in aridland ecosystems. To test this hypothesis, we experimentally altered the size and frequency of precipitation events during the summer monsoon (July through September) in 2007 and 2008 in a northern Chihuahuan Desert grassland in central New Mexico, USA. Treatments included (1) ambient rain, (2) ambient rain plus one 20 mm rain event each month, and (3) ambient rain plus four 5 mm rain events each month. Throughout two monsoon seasons, we measured soil temperature, soil moisture content (theta), soil respiration (R-s), along with leaf-level photosynthesis (A(net)), predawn leaf water potential (Psi(pd)), and seasonal aboveground net primary productivity (ANPP) of the dominant C-4 grass, Bouteloua eriopoda. Treatment plots receiving a single large rainfall event each month maintained significantly higher seasonal soil theta which corresponded with a significant increase in R-s and ANPP of B. eriopoda when compared with plots receiving multiple small events. Because the strength of these patterns differed between years, we propose a modification of the bucket model in which both the mean and variance of soil water change as a consequence of interannual variability from 1 year to the next. Our results demonstrate that aridland ecosystems are highly sensitive to increased precipitation variability, and that more extreme precipitation events will likely have a positive impact on some aridland ecosystem processes important for the carbon cycle.


英文关键词carbon cycle desert grasslands leaf gas exchange precipitation variability primary production soil respiration
类型Article
语种英语
国家USA ; Mexico
收录类别SCI-E
WOS记录号WOS:000287853000001
WOS关键词SEMIARID GRASSLAND ; SONORAN DESERT ; CO2 FLUX ; TERRESTRIAL ECOSYSTEMS ; RAINFALL VARIABILITY ; TEMPORAL DYNAMICS ; PLANT-RESPONSES ; CLIMATE-CHANGE ; NORTH-AMERICA ; GAS-EXCHANGE
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
来源机构Arizona State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/168342
作者单位1.Univ New Mexico, Dept Biol MSC03 2020, Albuquerque, NM 87131 USA;
2.CICESE, Dept Biol Conservac, Ensenada 22860, Baja California, Mexico
推荐引用方式
GB/T 7714
Thomey, Michell L.,Collins, Scott L.,Vargas, Rodrigo,et al. Effect of precipitation variability on net primary production and soil respiration in a Chihuahuan Desert grassland[J]. Arizona State University,2011,17(4):1505-1515.
APA Thomey, Michell L..,Collins, Scott L..,Vargas, Rodrigo.,Johnson, Jennifer E..,Brown, Renee F..,...&Friggens, Michael T..(2011).Effect of precipitation variability on net primary production and soil respiration in a Chihuahuan Desert grassland.GLOBAL CHANGE BIOLOGY,17(4),1505-1515.
MLA Thomey, Michell L.,et al."Effect of precipitation variability on net primary production and soil respiration in a Chihuahuan Desert grassland".GLOBAL CHANGE BIOLOGY 17.4(2011):1505-1515.
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