Arid
DOI10.1007/s00442-012-2552-0
Effects of experimental rainfall manipulations on Chihuahuan Desert grassland and shrubland plant communities
Baez, Selene1; Collins, Scott L.2; Pockman, William T.2; Johnson, Jennifer E.2; Small, Eric E.3
通讯作者Baez, Selene
来源期刊OECOLOGIA
ISSN0029-8549
出版年2013
卷号172期号:4页码:1117-1127
英文摘要

Aridland ecosystems are predicted to be responsive to both increases and decreases in precipitation. In addition, chronic droughts may contribute to encroachment of native C-3 shrubs into C-4-dominated grasslands. We conducted a long-term rainfall manipulation experiment in native grassland, shrubland and the grass-shrub ecotone in the northern Chihuahuan Desert, USA. We evaluated the effects of 5 years of experimental drought and 4 years of water addition on plant community structure and dynamics. We assessed the effects of altered rainfall regimes on the abundance of dominant species as well as on species richness and subdominant grasses, forbs and shrubs. Nonmetric multidimensional scaling and MANOVA were used to quantify changes in species composition in response to chronic addition or reduction of rainfall. We found that drought consistently and strongly decreased cover of Bouteloua eriopoda, the dominant C-4 grass in this system, whereas water addition slightly increased cover, with little variation between years. In contrast, neither chronic drought nor increased rainfall had consistent effects on the cover of Larrea tridentata, the dominant C-3 shrub. Species richness declined in shrub-dominated vegetation in response to drought whereas richness increased or was unaffected by water addition or drought in mixed- and grass-dominated vegetation. Cover of subdominant shrubs, grasses and forbs changed significantly over time, primarily in response to interannual rainfall variability more so than to our experimental rainfall treatments. Nevertheless, drought and water addition shifted the species composition of plant communities in all three vegetation types. Overall, we found that B. eriopoda responded strongly to drought and less so to irrigation, whereas L. tridentata showed limited response to either treatment. The strong decline in grass cover and the resistance of shrub cover to rainfall reduction suggest that chronic drought may be a key factor promoting shrub dominance during encroachment into desert grassland.


英文关键词Bouteloua eriopoda Climate change Drought Forbs Larrea tridentata Plant community structure Species richness Water addition
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000322180000019
WOS关键词NORTH-AMERICAN GRASSLANDS ; NET PRIMARY PRODUCTION ; SEMIARID GRASSLANDS ; LARREA-TRIDENTATA ; NEW-MEXICO ; PRECIPITATION VARIABILITY ; SPECIES INTERACTIONS ; DECREASES DIVERSITY ; ARIDLAND ECOSYSTEM ; TEMPORAL DYNAMICS
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/2XILL650/179064
作者单位1.Univ Florida, Gainesville, FL 32611 USA;
2.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA;
3.Univ Colorado, Dept Geol, Boulder, CO 80309 USA
推荐引用方式
GB/T 7714
Baez, Selene,Collins, Scott L.,Pockman, William T.,et al. Effects of experimental rainfall manipulations on Chihuahuan Desert grassland and shrubland plant communities[J],2013,172(4):1117-1127.
APA Baez, Selene,Collins, Scott L.,Pockman, William T.,Johnson, Jennifer E.,&Small, Eric E..(2013).Effects of experimental rainfall manipulations on Chihuahuan Desert grassland and shrubland plant communities.OECOLOGIA,172(4),1117-1127.
MLA Baez, Selene,et al."Effects of experimental rainfall manipulations on Chihuahuan Desert grassland and shrubland plant communities".OECOLOGIA 172.4(2013):1117-1127.
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