干旱区生态环境知识资源中心(Arid): A seed-seedling conflict for Atriplex polycarpa shrubs competing with exotic grasses and their residual dry matter

Arid

DOI	10.1002/ecs2.3455
	A seed-seedling conflict for Atriplex polycarpa shrubs competing with exotic grasses and their residual dry matter
	Coleman, Mitchell L.; Mayence, C. Ellery; White, Michael D.; Jacobsen, Anna L.; Pratt, R. Brandon
通讯作者	Coleman, ML (corresponding author), Calif State Univ Bakersfield, Dept Biol, 9001 Stockdale Highway, Bakersfield, CA 93311 USA. ; Coleman, ML (corresponding author), Tejon Ranch Conservancy, 637 San Emidio Way, Frazier Pk, CA 93225 USA.
来源期刊	ECOSPHERE
ISSN	2150-8925
出版年	2021
卷号	12 期号:4
英文摘要	Native saltbush, Atriplex polycarpa, shrub populations are widely diminished and fragmented in the southern San Joaquin Desert of California due to habitat conversion and invasion by exotic annual grasses of mostly Mediterranean origin. The role these grasses play in saltbush population demography is not well understood. We hypothesized that saltbush seedling recruitment and growth is limited by the competitive interactions with exotic grasses, preventing saltbush stands from maintaining their populations and expanding. We predicted that saltbush seedling recruitment would be reduced by (1) light and moisture competition with the grasses; and (2) the physical barrier of grass residual dry matter (RDM) formed during senescence. To test our predictions, we investigated saltbush seedling recruitment under field conditions across six saltbush populations. We examined how variations in edaphic structure and water availability by site may have affected saltbush seedling recruitment and longer-term population dynamics. In experimental plots where saltbush seeds were sowed, exotic grass RDM reduced saltbush seedling emergence compared to seeds sown in the absence of RDM; competition post-emergence was not significant. Saltbush seedlings transplanted into the field had lower mortality and less herbivory in invaded grassy habitats compared to seedlings planted in bare zones in between established, mature saltbush shrubs. Edaphic variation and water availability by site were likely key factors affecting the success of both grass invasion and saltbush recruitment. Our results suggest that there is a seed-seedling conflict: Sites favorable for saltbush seedling emergence (minimal grass cover among mature shrubs) are unfavorable for seedling survival due to high herbivory. Conversely, sites favorable for saltbush seedling survival (high grass coverage away from mature shrubs) are unfavorable for seedling emergence. The RDM produced by grasses represents an important stabilizing feedback favoring continued grass dominance.
英文关键词	Atriplex polycarpa Bromus Chenopodiaceae competition exotic annual grasses recruitment residual dry matter San Joaquin Desert
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000645597500005
WOS关键词	INVASIVE GRASS ; RECRUITMENT ; DESERT ; GROWTH ; GERMINATION ; PREDATION ; DENSITY ; LITTER
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	University of Western Australia
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350047
作者单位	[Coleman, Mitchell L.; Jacobsen, Anna L.; Pratt, R. Brandon] Calif State Univ Bakersfield, Dept Biol, 9001 Stockdale Highway, Bakersfield, CA 93311 USA; [Coleman, Mitchell L.; Mayence, C. Ellery; White, Michael D.] Tejon Ranch Conservancy, 637 San Emidio Way, Frazier Pk, CA 93225 USA; [Mayence, C. Ellery] New Zealand Dept Conservat, Private Bag 4715, Christchurch 8140, New Zealand; [Mayence, C. Ellery] Univ Western Australia, Sch Biol Sci, Perth, WA 6005, Australia; [White, Michael D.] San Diego State Univ, Dept Biol Sci, 5500 Campanile Dr, San Diego, CA 92182 USA
推荐引用方式 GB/T 7714	Coleman, Mitchell L.,Mayence, C. Ellery,White, Michael D.,et al. A seed-seedling conflict for Atriplex polycarpa shrubs competing with exotic grasses and their residual dry matter[J]. University of Western Australia,2021,12(4).
APA	Coleman, Mitchell L.,Mayence, C. Ellery,White, Michael D.,Jacobsen, Anna L.,&Pratt, R. Brandon.(2021).A seed-seedling conflict for Atriplex polycarpa shrubs competing with exotic grasses and their residual dry matter.ECOSPHERE,12(4).
MLA	Coleman, Mitchell L.,et al."A seed-seedling conflict for Atriplex polycarpa shrubs competing with exotic grasses and their residual dry matter".ECOSPHERE 12.4(2021).