Arid
DOI10.1007/s11258-012-0085-6
Effects of elevated nitrogen and exotic plant invasion on soil seed bank composition in Joshua Tree National Park
Schneider, Heather E.; Allen, Edith B.
通讯作者Schneider, Heather E.
来源期刊PLANT ECOLOGY
ISSN1385-0237
出版年2012
卷号213期号:8页码:1277-1287
英文摘要

We investigated the effects of exotic species invasion and 3 years of nitrogen (N) fertilization on the soil seed bank in Joshua Tree National Park, California, USA at four sites along an N deposition gradient. We compared seed bank composition and density in control (no N added) and fertilized (30 kg N ha(-1) year(-1)) plots to determine if the seed bank would reflect aboveground changes due to N fertilization. Soil samples were collected and germinated in a greenhouse over 2 years. In the field, invasive species cover responded positively to N fertilization. However, we did not observe increased seed density of exotic invasive species in fertilized plots. While no significant differences were detected between treatments within sites, exotic invasive grass seeds overwhelmed the seed bank at all sites. Significant differences between sites were found, which may be due to differences in level of invasion, historic N deposition, and soil surface roughness. Sites experiencing low N deposition had the highest seed bank species richness for both control and fertilized treatments. Aboveground plant density did not correlate well with seed bank density, possibly due to the inherent patchiness of soil seed banks and differential ability of species to form seed banks. This seed bank study provided insight into site-specific impacts on native versus invasive species composition of soil seed banks, as well as magnitude of invasion and restoration potential at invaded sites.


英文关键词Soil seed bank Desert Exotic invasive Joshua Tree National Park Annual plant Schismus
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000306694200007
WOS关键词SOUTHERN CALIFORNIA DESERTS ; MOJAVE DESERT ; DEPOSITION ; GERMINATION ; CONSEQUENCES ; COMPETITION ; HABITATS ; GRASSES ; FATES ; SHAPE
WOS类目Plant Sciences ; Ecology ; Forestry
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174462
作者单位Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA
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Schneider, Heather E.,Allen, Edith B.. Effects of elevated nitrogen and exotic plant invasion on soil seed bank composition in Joshua Tree National Park[J],2012,213(8):1277-1287.
APA Schneider, Heather E.,&Allen, Edith B..(2012).Effects of elevated nitrogen and exotic plant invasion on soil seed bank composition in Joshua Tree National Park.PLANT ECOLOGY,213(8),1277-1287.
MLA Schneider, Heather E.,et al."Effects of elevated nitrogen and exotic plant invasion on soil seed bank composition in Joshua Tree National Park".PLANT ECOLOGY 213.8(2012):1277-1287.
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