干旱区生态环境知识资源中心(Arid): Effect of Grazing and Drought on Seed Bank in Semiarid Patchy Rangelands of Northern Patagonia, Argentina

Arid

DOI	10.1086/702661
	Effect of Grazing and Drought on Seed Bank in Semiarid Patchy Rangelands of Northern Patagonia, Argentina
	Funk, Flavia A.1,2; Loydi, Alejandro 1,2,3; Peter, Guadalupe 4,5; Distel, Roberto A.1,2,6
通讯作者	Funk, Flavia A.
来源期刊	INTERNATIONAL JOURNAL OF PLANT SCIENCES
ISSN	1058-5893
EISSN	1537-5315
出版年	2019
卷号	180 期号:4 页码:337-344
英文摘要	Premise of research. The soil seed bank (SSB) plays a critical role in vegetation regeneration after stress and/or disturbance events. Here, we analyzed how drought and grazing influence the SSB of shrub patches and interpatches in a rangeland from northern Patagonia. Methodology. Soil samples were collected from shrub patches and interpatches on heavily grazed, moderately grazed, and ungrazed sites at the end of a multiyear drought and 2 yr after the end of the drought. Sampling was done immediately before seed dispersion of the dominant species in order to study the persistent seed bank. Seeds were separated from the mineral soil by elutriation and grouped into four life-forms: annual grasses, perennial grasses, forbs, and shrubs. Pivotal results. In all sampling conditions, the SSB was markedly dominated by forbs. Total seed density and seed density of every life-form were higher in shrub patches than in interpatches. Seed density of grasses and shrubs was not influenced by drought and grazing in both shrub patches and interpatches. In contrast, seed density of forbs was negatively influenced by drought in interpatches and positively influenced by grazing in shrub patches. Conclusions. The results suggest that in patchy rangelands of northern Patagonia the SSB of shrub patches is less severely depleted than that of interpatches during multiyear droughts, particularly for forbs under high grazing intensity. However, the growth of the SSB after drought is a slow process in both shrub patches and interpatches. Our results highlight the importance of grazing pressure alleviation during drought conditions to safeguard the SSB, which is the only source of seedling recruitment for most species in northern Patagonia rangelands.
英文关键词	dry grasslands grazing intensity shrub steppes vegetation distribution
类型	Article
语种	英语
国家	Argentina
收录类别	SCI-E
WOS记录号	WOS:000467142600005
WOS关键词	SEASONAL-VARIATION ; GRASSLAND ; VEGETATION ; DYNAMICS ; HERBIVORY ; RESPONSES ; PATTERNS ; GRASSES ; DESERT ; GERMINATION
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216490
作者单位	1.Consejo Nacl Invest Cient & Tecn, Consejo Nacl Invest Cient & Tecn Republ Argentina, Ctr Recursos Nat Renovables Zona Semiarida CERZOS, Bahia Blanca, Buenos Aires, Argentina; 2.Univ Nacl Sur, Bahia Blanca, Buenos Aires, Argentina; 3.Univ Nacl Sur, Dept Biol Bioquim & Farm, Bahia Blanca, Buenos Aires, Argentina; 4.Consejo Nacl Invest Cient & Tecn, Viedma, Argentina; 5.Univ Nacl Rio Negro, Viedma, Argentina; 6.Univ Nacl Sur, Dept Agron, Bahia Blanca, Buenos Aires, Argentina
推荐引用方式 GB/T 7714	Funk, Flavia A.,Loydi, Alejandro,Peter, Guadalupe,et al. Effect of Grazing and Drought on Seed Bank in Semiarid Patchy Rangelands of Northern Patagonia, Argentina[J],2019,180(4):337-344.
APA	Funk, Flavia A.,Loydi, Alejandro,Peter, Guadalupe,&Distel, Roberto A..(2019).Effect of Grazing and Drought on Seed Bank in Semiarid Patchy Rangelands of Northern Patagonia, Argentina.INTERNATIONAL JOURNAL OF PLANT SCIENCES,180(4),337-344.
MLA	Funk, Flavia A.,et al."Effect of Grazing and Drought on Seed Bank in Semiarid Patchy Rangelands of Northern Patagonia, Argentina".INTERNATIONAL JOURNAL OF PLANT SCIENCES 180.4(2019):337-344.