globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13493
论文题名:
Press–pulse interactions: effects of warming, N deposition, altered winter precipitation, and fire on desert grassland community structure and dynamics
作者: Collins S.L.; Ladwig L.M.; Petrie M.D.; Jones S.K.; Mulhouse J.M.; Thibault J.R.; Pockman W.T.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:3
起始页码: 1095
结束页码: 1108
语种: 英语
英文关键词: aboveground net primary production ; Bouteloua eriopoda ; Bouteloua gracilis ; desert grassland ; fire ; nighttime warming ; nitrogen addition ; soil moisture ; species richness
Scopus关键词: Bouteloua eriopoda ; Bouteloua gracilis ; Poaceae
英文摘要: Global environmental change is altering temperature, precipitation patterns, resource availability, and disturbance regimes. Theory predicts that ecological presses will interact with pulse events to alter ecosystem structure and function. In 2006, we established a long-term, multifactor global change experiment to determine the interactive effects of nighttime warming, increased atmospheric nitrogen (N) deposition, and increased winter precipitation on plant community structure and aboveground net primary production (ANPP) in a northern Chihuahuan Desert grassland. In 2009, a lightning-caused wildfire burned through the experiment. Here, we report on the interactive effects of these global change drivers on pre- and postfire grassland community structure and ANPP. Our nighttime warming treatment increased winter nighttime air temperatures by an average of 1.1 °C and summer nighttime air temperature by 1.5 °C. Soil N availability was 2.5 times higher in fertilized compared with control plots. Average soil volumetric water content (VWC) in winter was slightly but significantly higher (13.0% vs. 11.0%) in plots receiving added winter rain relative to controls, and VWC was slightly higher in warmed (14.5%) compared with control (13.5%) plots during the growing season even though surface soil temperatures were significantly higher in warmed plots. Despite these significant treatment effects, ANPP and plant community structure were highly resistant to these global change drivers prior to the fire. Burning reduced the cover of the dominant grasses by more than 75%. Following the fire, forb species richness and biomass increased significantly, particularly in warmed, fertilized plots that received additional winter precipitation. Thus, although unburned grassland showed little initial response to multiple ecological presses, our results demonstrate how a single pulse disturbance can interact with chronic alterations in resource availability to increase ecosystem sensitivity to multiple drivers of global environmental change. © 2016 John Wiley & Sons Ltd
资助项目: Research based on dataset SEV_205 is available at http://sev.lternet.edu. We thank two anonymous reviewers for comments that greatly improved the manuscript. We would also like to thank Renee Brown and Don Natvig for installing and maintaining the wireless data retrieval system and the Sevilleta LTER Field Crew for data collection. This research was supported by NSF Award DEB-0516458 and by Awards DEB-0620482 and DEB-1232294 to the University of New Mexico for Long-term Ecological Research. The authors declare no conflict of interest.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61047
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Biology, University of New Mexico, MSC03-2020, Albuquerque, NM, United States; Department of Zoology, University of Wisconsin, 430 Lincoln Drive, 545 Birge Hall, Madison, WI, United States; Department of Botany, University of Wyoming, Laramie, WY, United States

Recommended Citation:
Collins S.L.,Ladwig L.M.,Petrie M.D.,et al. Press–pulse interactions: effects of warming, N deposition, altered winter precipitation, and fire on desert grassland community structure and dynamics[J]. Global Change Biology,2017-01-01,23(3)
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