Ecological role of physical dormancy in seeds of Oxytropis racemosa in a semiarid sandland with unpredictable rainfall

doi:10.1093/jpe/rtx063

	Ecological role of physical dormancy in seeds of Oxytropis racemosa in a semiarid sandland with unpredictable rainfall
	Hu, Dandan 1; Baskin, Jerry M.; Baskin, Carol C.; Yang, Xuejun ; Huang, Zhenying
	2018
发表期刊	JOURNAL OF PLANT ECOLOGY
ISSN	1752-9921
卷号	11 期号:4 页码:542-552
摘要	Aims Seed dormancy and the soil seed bank are crucial to plant regeneration strategy, especially in semiarid ecosystems with unpredictable precipitation. The aim of this study was to investigate how seed dormancy is controlled by environmental factors and how it is correlated with the soil seed bank and regeneration of the perennial legume Oxytropis racemosa, a dominant perennial herb in Mu Us Sandland of semiarid China. Methods Germination and imbibition experiments on fresh intact and scarified seeds of O. racemosa were used to identify physical dormancy (PY) in seeds of this species. Soil seed bank dynamics, timing of seedling emergence and the fate of buried seeds in the natural habitat were investigated. Important Findings PY was broken by mechanical scarification or wet heat/ice water cycles but not solely by dry heat or wet heat treatment. The soil seed bank exhibited seasonal changes in the number of seeds, which was highest in September and lowest in July. Seeds buried at different sand depths gradually lost dormancy; 20-42% of the seeds remained dormant after 20 months of burial. Dormancy break occurs gradually throughout the year. Our results indicate that O. racemosa exhibits hardcoatedness heterogeneity that spreads germination of a seed cohort between seasons and years in the semiarid environment, where the amount of precipitation during the growing season is highly variable.
关键词	Oxytropis racemosa physical dormancy seedling emergence soil moisture soil seed bank soil temperature unpredictable rainfall
学科领域	Plant Sciences ; Ecology ; Forestry
DOI	10.1093/jpe/rtx063
收录类别	SCI
语种	英语
WOS关键词	1ST REPORT ; WATER-GAP ; GERMINATION ; BANKS ; REQUIREMENTS ; BREAKING ; FIRE ; SAPINDACEAE ; POPULATIONS ; PERSISTENCE
WOS记录号	WOS:000433291100004
出版者	OXFORD UNIV PRESS
文献子类	Article
出版地	OXFORD
EISSN	1752-993X
资助机构	Key Basic Research and Development Plan of P. R. China [2016YFC050080502] ; National Natural Science Foundation of P. R. ChinaNational Natural Science Foundation of China (NSFC) [31370705, 31570416]
作者邮箱	zhenying@ibcas.ac.cn
作品OA属性	Bronze
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/20499
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 20 Nanxincun, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, 19 A Yuquan Rd, Beijing 100039, Peoples R China 3.Baskin, Jerry M.; Baskin, Carol C.] Univ Kentucky, Dept Biol, Lexington, KY 40506 USA 4.Baskin, Carol C.] Univ Kentucky, Dept Plant & Soil Sci, Lexington, KY 40546 USA
推荐引用方式 GB/T 7714	Hu, Dandan,Baskin, Jerry M.,Baskin, Carol C.,et al. Ecological role of physical dormancy in seeds of Oxytropis racemosa in a semiarid sandland with unpredictable rainfall[J]. JOURNAL OF PLANT ECOLOGY,2018,11(4):542-552.
APA	Hu, Dandan,Baskin, Jerry M.,Baskin, Carol C.,Yang, Xuejun,&Huang, Zhenying.(2018).Ecological role of physical dormancy in seeds of Oxytropis racemosa in a semiarid sandland with unpredictable rainfall.JOURNAL OF PLANT ECOLOGY,11(4),542-552.
MLA	Hu, Dandan,et al."Ecological role of physical dormancy in seeds of Oxytropis racemosa in a semiarid sandland with unpredictable rainfall".JOURNAL OF PLANT ECOLOGY 11.4(2018):542-552.

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