DOI: 10.1007/s00442-019-04575-x
论文题名: Rainfall, not soil temperature, will limit the seed germination of dry forest species with climate change
作者: Dantas B.F. ; Moura M.S.B. ; Pelacani C.R. ; Angelotti F. ; Taura T.A. ; Oliveira G.M. ; Bispo J.S. ; Matias J.R. ; Silva F.F.S. ; Pritchard H.W. ; Seal C.E.
刊名: Oecologia
ISSN: 298549
出版年: 2020
卷: 192, 期: 2 语种: 英语
英文关键词: Climate change
; Drought
; Functional trait
; Salinity
; Seed germination modelling
; Temperature threshold
Scopus关键词: arid region
; climate change
; drought
; dry forest
; functional role
; future prospect
; germination
; rainfall
; salinity
; soil temperature
; threshold
; tropical forest
; Brazil
; climate change
; forest
; germination
; plant seed
; soil
; temperature
; Brazil
; Climate Change
; Forests
; Germination
; Seeds
; Soil
; Temperature
英文摘要: Drylands are predicted to become more arid and saline due to increasing global temperature and drought. Although species from the Caatinga, a Brazilian tropical dry forest, are tolerant to these conditions, the capacity for germination to withstand extreme soil temperature and water deficit associated with climate change remains to be quantified. We aimed to evaluate how germination will be affected under future climate change scenarios of limited water and increased temperature. Seeds of three species were germinated at different temperatures and osmotic potentials. Thermal time and hydrotime model parameters were established and thresholds for germination calculated. Germination performance in 2055 was predicted, by combining temperature and osmotic/salt stress thresholds, considering soil temperature and moisture following rainfall events. The most pessimistic climate scenario predicts an increase of 3.9 °C in soil temperature and 30% decrease in rainfall. Under this scenario, soil temperature is never lower than the minimum and seldomly higher than maximum temperature thresholds for germination. As long as the soil moisture (0.139 cm3 cm3) requirements are met, germination can be achieved in 1 day. According to the base water potential and soil characteristics, the minimum weekly rainfall for germination is estimated to be 17.5 mm. Currently, the required minimum rainfall occurs in 14 weeks of the year but will be reduced to 4 weeks by 2055. This may not be sufficient for seedling recruitment of some species in the natural environment. Thus, in future climate scenarios, rainfall rather than temperature will be extremely limiting for seed germination. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159555
Appears in Collections: 气候变化与战略
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作者单位: Embrapa Semiárido, Caixa Postal 23, Rodovia BR-428, Km 152, Zona Rural, Petrolina, PE 56302-970, Brazil; Universidade Estadual de Feira de Santana- UEFS, Feira de Santana, BA, Brazil; Universidade do Estado da Bahia- UNEB, Juazeiro, BA, Brazil; Universidade Federal Rural do Semiárido- UFERSA, Mossoró, RN, Brazil; Department of Comparative Plant and Fungal Biology, Royal Botanic Gardens, Kew, Wakehurst Place, Ardingly, United Kingdom
Recommended Citation:
Dantas B.F.,Moura M.S.B.,Pelacani C.R.,et al. Rainfall, not soil temperature, will limit the seed germination of dry forest species with climate change[J]. Oecologia,2020-01-01,192(2)