干旱区生态环境知识资源中心(Arid): Climate and disturbance influence self-sustaining stand dynamics of aspen (Populus tremuloides) near its range margin

Arid

DOI	10.1002/eap.1948
	Climate and disturbance influence self-sustaining stand dynamics of aspen (Populus tremuloides) near its range margin
	Shinneman, Douglas J.; McIlroy, Susan K.
通讯作者	Shinneman, Douglas J.
来源期刊	ECOLOGICAL APPLICATIONS
ISSN	1051-0761
EISSN	1939-5582
出版年	2019
卷号	29 期号:6
英文摘要	Species that are primarily seral may form stable (self-sustaining) communities under certain disturbance regimes or environmental conditions, yet such populations may also be particularly vulnerable to ecological change. Aspen (Populus spp.) are generally considered seral throughout the Northern Hemisphere, including P. tremuloides, the most widely distributed tree species in North America. Recent declines in aspen populations have occurred, especially along drought-sensitive margins of its range and where fire exclusion and herbivory have promoted community transition. However, aspen also forms stable stands, and examination of the mechanisms that influence persistence can offer conservation insights, especially where populations are vulnerable to changing climate or altered disturbance dynamics. We sampled tree age and stand characteristics of isolated aspen forests in the arid Great Basin (USA) to determine if (1) aspen communities are more fire-dependent and seral or fire-independent and stable; (2) ungulate browsing inhibits aspen stability; and (3) temporal patterns of vegetative reproduction (i.e., ramet establishment or suckering) are correlated with climate. Aspen size and age class densities strongly fit negative exponential distributions, whether grouped geographically or by functional type, suggesting landscape-scale persistence. Continuous age distributions and high proportions of recruitment-sized to overstory trees suggest stability at stand scales, with exceptions including stands with higher browsing pressure. Few stands had evidence of fire, and relationships between dead tree size and variability in live tree size suggest a lack of fire dependency. Several 5-yr averaged climate variables and one sea surface temperature index were correlated with aspen ramet establishment densities over time, with strongest relationships occurring similar to 5 yr prior to establishment year, often followed by inverse relationships similar to 1 yr after. Indeed, aspen establishment density for a recent 41-yr period was reliably reconstructed using antecedent climate conditions derived from a single drought index. Temporally synchronized aspen ramet establishment across the study region may be due to climate-driven storage of nonstructural carbohydrate reserves in clonal root systems later used for regeneration. Complex regeneration dynamics of these self-sustaining aspen stands, especially sensitivity to climate variability, suggest they may serve as harbingers of ecological change in the arid Great Basin and in other aspen populations near their range margin.
英文关键词	aspen clone fire nonstructural carbohydrates Palmer Drought Severity Index Populus tremuloides recruitment regeneration sea surface temperatures seral succession ungulate browsing
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000476086600001
WOS关键词	SAN-JUAN MOUNTAINS ; QUAKING ASPEN ; CARBOHYDRATE RESERVES ; MULTIDECADAL DROUGHT ; NATIONAL-PARK ; AGE STRUCTURE ; GREAT-BASIN ; FIRE ; COLORADO ; GROWTH
WOS类目	Ecology ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215154
作者单位	US Geol Survey, Forest & Rangeland Ecosyst Sci Ctr, 970 Lusk St, Boise, ID 83706 USA
推荐引用方式 GB/T 7714	Shinneman, Douglas J.,McIlroy, Susan K.. Climate and disturbance influence self-sustaining stand dynamics of aspen (Populus tremuloides) near its range margin[J]. United States Geological Survey,2019,29(6).
APA	Shinneman, Douglas J.,&McIlroy, Susan K..(2019).Climate and disturbance influence self-sustaining stand dynamics of aspen (Populus tremuloides) near its range margin.ECOLOGICAL APPLICATIONS,29(6).
MLA	Shinneman, Douglas J.,et al."Climate and disturbance influence self-sustaining stand dynamics of aspen (Populus tremuloides) near its range margin".ECOLOGICAL APPLICATIONS 29.6(2019).