Arid
DOI10.1007/s00442-003-1255-y
Dominant cold desert plants do not partition warm season precipitation by event size
Schwinning, S; Starr, BI; Ehleringer, JR
通讯作者Schwinning, S
来源期刊OECOLOGIA
ISSN0029-8549
出版年2003
卷号136期号:2页码:252-260
英文摘要

We conducted experiments to examine the quantitative relationships between rainfall event size and rainwater uptake and use by four common native plant species of the Colorado Plateau, including two perennial grasses, Hilaria jamesii (C-4) and Oryzopsis hymenoides (C-3), and two shrubs, Ceratoides lanata (C-3), and Gutierrezia sarothrae (C-3). Specifically, we tested the hypothesis that grasses use small rainfall events more efficiently than shrubs and lose this advantage when events are large. Rainfall events between 2 and 20 mm were simulated in spring and summer by applying pulses of deuterium-labeled irrigation water. Afterwards, pulse water fractions in stems and the rates of leaf gas exchange were monitored for 9 days. Cumulative pulse water uptake over this interval (estimated by integrating the product of pulse fraction in stem water and daytime transpiration rate over time) was approximately linearly related to the amount of pulse water added to the ground in all four species. Across species, consistently more pulse water was taken up in summer than in spring. Relative to their leaf areas, the two grass species took up more pulse water than the two shrub species, across all event sizes and in both seasons, thus refuting the initial hypothesis. In spring, pulse water uptake did not significantly increase photosynthetic rates and in summer, pulse water uptake had similar, but relatively small effects on the photosynthetic rates of the three C-3 plants, and a larger effect on the C-4 plant H. jamesii. Based on these data, we introduce an alternative hypothesis for the responses of plant functional types to rainfall events of different sizes, building on cost-benefit considerations for active physiological responses to sudden, unpredictable changes in water availability.


英文关键词deuterium-labeled irrigation niche separation precipitation change rain use efficiency
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000184092500010
WOS关键词RAINFALL EVENTS ; PHOTOSYNTHETIC CAPACITY ; STOMATAL CONDUCTANCE ; HEAVY PRECIPITATION ; SHORTGRASS STEPPE ; COLORADO PLATEAU ; WATER ; COMMUNITY ; NITROGEN ; SHRUBS
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/2XILL650/145538
作者单位(1)Univ Utah, Biosphere Ctr 2, Oracle, AZ 85623 USA;(2)Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA
推荐引用方式
GB/T 7714
Schwinning, S,Starr, BI,Ehleringer, JR. Dominant cold desert plants do not partition warm season precipitation by event size[J],2003,136(2):252-260.
APA Schwinning, S,Starr, BI,&Ehleringer, JR.(2003).Dominant cold desert plants do not partition warm season precipitation by event size.OECOLOGIA,136(2),252-260.
MLA Schwinning, S,et al."Dominant cold desert plants do not partition warm season precipitation by event size".OECOLOGIA 136.2(2003):252-260.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Schwinning, S]的文章
[Starr, BI]的文章
[Ehleringer, JR]的文章
百度学术
百度学术中相似的文章
[Schwinning, S]的文章
[Starr, BI]的文章
[Ehleringer, JR]的文章
必应学术
必应学术中相似的文章
[Schwinning, S]的文章
[Starr, BI]的文章
[Ehleringer, JR]的文章
相关权益政策
暂无数据
收藏/分享

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。