Arid
DOI10.1007/s10021-005-0138-y
Synchrony of seed dispersal, hydrology and local climate in a semi-arid river reach in California
Stella, John C.; Battles, John J.; Orr, Bruce K.; McBride, Joe R.
通讯作者Stella, John C.
来源期刊ECOSYSTEMS
ISSN1432-9840
出版年2006
卷号9期号:7页码:1200-1214
英文摘要

The temporal availability of propagules is a critical factor in sustaining pioneer riparian tree populations along snowmelt-driven rivers because seedling establishment is strongly linked to seasonal hydrology. River regulation in semi-arid regions threatens to decouple seed development and dispersal from the discharge regime to which they evolved. Using the lower Tuolumne River as a model system, we quantified and modeled propagule availability for Populus fremontii (POFR), Salix gooddingii (SAGO), and Salix exigua (SAEX), the tree and shrub species that dominate near-channel riparian stands in the San Joaquin Basin, CA. A degree-day model was fit to field data of seasonal seed density and local temperature from three sites in 2002-2004 to predict the onset of the peak dispersal period. To evaluate historical synchrony of seed dispersal and seasonal river hydrology, we compared peak spring runoff timing to modeled peak seed release periods for the last 75 years. The peak seed release period began on May 15 for POFR (range April 23-June 10), May 30 for SAGO (range May 19-June 11) and May 31 for SAEX (range May 8-June 30). Degree-day models for the onset of seed release reduced prediction error by 40-67% over day-of-year means; the models predicted best the interannual, versus site-to-site, variation in timing. The historical analysis suggests that POFR seed release coincided with peak runoff in almost all years, whereas SAGO and SAEX dispersal occurred during the spring flood recession. The degree-day modeling approach reduce uncertainty in dispersal timing and shows potential for guiding flow releases on regulated rivers to increase riparian tree recruitment at the lowest water cost.


英文关键词phenology seed dispersal degree-day model seed longevity germination Populus Salix seedling recruitment riparian habitat restoration flow regulation California central-valley
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000242334600014
WOS关键词WESTERN UNITED-STATES ; FREMONT COTTONWOOD ; RIPARIAN COTTONWOODS ; LINEAR-REGRESSION ; TEMPERATURE DATA ; SNOWMELT RUNOFF ; MISSOURI RIVER ; FLOW REGIMES ; GERMINATION ; WATER
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构University of California, Berkeley
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/151280
作者单位(1)Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA;(2)Stillwater Sci, Berkeley, CA 94705 USA
推荐引用方式
GB/T 7714
Stella, John C.,Battles, John J.,Orr, Bruce K.,et al. Synchrony of seed dispersal, hydrology and local climate in a semi-arid river reach in California[J]. University of California, Berkeley,2006,9(7):1200-1214.
APA Stella, John C.,Battles, John J.,Orr, Bruce K.,&McBride, Joe R..(2006).Synchrony of seed dispersal, hydrology and local climate in a semi-arid river reach in California.ECOSYSTEMS,9(7),1200-1214.
MLA Stella, John C.,et al."Synchrony of seed dispersal, hydrology and local climate in a semi-arid river reach in California".ECOSYSTEMS 9.7(2006):1200-1214.
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