干旱区生态环境知识资源中心(Arid): Seed germination and plant fitness response of a narrowly endemic, rare winter annual to spatial heterogeneity in microenvironment

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DOI	10.1111/1442-1984.12292
	Seed germination and plant fitness response of a narrowly endemic, rare winter annual to spatial heterogeneity in microenvironment
	Kaur, Jaspreet; Schwilk, Dylan; Sharma, Jyotsna
通讯作者	Kaur, J
来源期刊	PLANT SPECIES BIOLOGY
ISSN	0913-557X
EISSN	1442-1984
英文摘要	Environmental heterogeneity affects distributions of plant species, although the effects of fine-scale heterogeneity on plant demographies are not widely studied. Diminutive winter annuals, especially rare taxa, can be sensitive to spatial variation in microenvironment as a consequence of their small stature above and belowground. To address whether spatial environmental heterogeneity affects demography, germination and fitness ofChorizanthe orcuttiana, an endangered winter annual distributed in distinct easterly and westerly microhabitats within an exceedingly narrow niche in California, we performed multiyear observational and empirical studies. We manipulated after-ripening environment, soil moisture and ambient light at both aspects, and profiled microclimate, soil physicochemistry and soil microbiomes at all sites. We show that easterly aspects host larger plants in larger populations, and have lower air temperatures combined with higher soil moisture in comparison to the west-facing sites. Yet, soil physicochemistry and microbiomes were similar across all sites. Manipulations of after-ripening conditions showed that seeds exposed to low humidity (17%) during dormancy and sown at easterly aspects exhibited the highest germination percentages, whereas seeds incubatedin situand subsequently sown at westerly aspects yielded the lowest germination. Simultaneous manipulations of soil moisture and light showed that at both aspects higher moisture combined with shade led to higher germination, whereas ambient soil moisture combined with shade yielded the lowest germination. Altogether, our studies show that the diminutive, rare winter annualC. orcuttianaexhibits higher germination and plant fitness under cooler soil conditions with higher soil moisture while preferring drier environments during after-ripening.
英文关键词	after-ripening aspect microclimate microhabitat soil moisture
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000564616900001
WOS关键词	POPULATION-STRUCTURE ; CHORIZANTHE-RIGIDA ; CLIMATE-CHANGE ; LIFE-HISTORY ; DESERT ; TEMPERATURE ; DORMANCY ; DYNAMICS ; MICROHABITAT ; PATTERNS
WOS类目	Plant Sciences ; Ecology
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328195
作者单位	[Kaur, Jaspreet; Sharma, Jyotsna] Texas Tech Univ, Dept Plant & Soil Sci, Lubbock, TX 79409 USA; [Schwilk, Dylan] Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA
推荐引用方式 GB/T 7714	Kaur, Jaspreet,Schwilk, Dylan,Sharma, Jyotsna. Seed germination and plant fitness response of a narrowly endemic, rare winter annual to spatial heterogeneity in microenvironment[J].
APA	Kaur, Jaspreet,Schwilk, Dylan,&Sharma, Jyotsna.
MLA	Kaur, Jaspreet,et al."Seed germination and plant fitness response of a narrowly endemic, rare winter annual to spatial heterogeneity in microenvironment".PLANT SPECIES BIOLOGY