Arid
DOI10.1016/j.jaridenv.2015.01.018
Top-down vs. bottom-up regulation of herbaceous primary production and composition in an arid, urbanizing ecosystem
Davis, Michelle K.1; Cook, Elizabeth M.1; Collins, Scott L.2; Hall, Sharon J.1
通讯作者Cook, Elizabeth M.
来源期刊JOURNAL OF ARID ENVIRONMENTS
ISSN0140-1963
EISSN1095-922X
出版年2015
卷号116页码:103-114
英文摘要

Plant growth and composition are regulated by top-down (e.g., herbivory) and bottom-up factors (e.g., resource availability). The relative importance of consumers and multiple resources for net primary production (NPP) and community structure have rarely been studied in drylands, which cover about one third of Earth’s land surface, or with respect to increasingly common environmental changes such as urbanization. Urban expansion in drylands is likely to alter both nutrient availability and consumer populations. We explored the relative roles of herbivory, precipitation, and soil nitrogen (N) availability as drivers of aboveground NPP and composition of herbaceous communities in protected native ecosystems in the Sonoran Desert within and surrounding Phoenix, Arizona. Precipitation was the primary driver of production, while soil N availability had little effect on growth. Herbivory was secondarily important relative to precipitation, reducing aboveground biomass by similar to 33% regardless of proximity to the city. Protected desert open space supported distinct plant communities within and surrounding the city, but these patterns were more strongly related to bottom-up resources than consumers. Together, our results suggest that urbanization does not significantly affect the relative drivers of plant growth and structure in this arid ecosystem. (c) 2015 Elsevier Ltd. All rights reserved.


英文关键词Consumer-resource dynamics NPP Herbaceous annual plant communities Herbivory Urban Sonoran desert
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000350840100016
WOS关键词PLANT COMMUNITY STRUCTURE ; SONORAN DESERT ANNUALS ; CHIHUAHUAN DESERT ; EXPLOITATION ECOSYSTEMS ; NITROGEN DEPOSITION ; DRYLAND ECOSYSTEMS ; RESOURCE CONTROL ; PULSE DYNAMICS ; MOJAVE DESERT ; UNITED-STATES
WOS类目Ecology ; Environmental Sciences
WOS研究方向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/2XILL650/188320
作者单位1.Arizona State Univ, Sch Life Sci, Tempe, AZ 85281 USA;
2.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA
推荐引用方式
GB/T 7714
Davis, Michelle K.,Cook, Elizabeth M.,Collins, Scott L.,et al. Top-down vs. bottom-up regulation of herbaceous primary production and composition in an arid, urbanizing ecosystem[J]. Arizona State University,2015,116:103-114.
APA Davis, Michelle K.,Cook, Elizabeth M.,Collins, Scott L.,&Hall, Sharon J..(2015).Top-down vs. bottom-up regulation of herbaceous primary production and composition in an arid, urbanizing ecosystem.JOURNAL OF ARID ENVIRONMENTS,116,103-114.
MLA Davis, Michelle K.,et al."Top-down vs. bottom-up regulation of herbaceous primary production and composition in an arid, urbanizing ecosystem".JOURNAL OF ARID ENVIRONMENTS 116(2015):103-114.
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