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Germination strategies under climate change scenarios along an aridity gradient

Journal of Plant Ecology 2020年第4期13卷 470-477页

作者： Alexander Zogas evsey kosman Marcelo Sternberg Porter School of Environmental Studies Tel Aviv UniversityTel AvivIsrael School of Plant Sciences and Food Security George S.Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael Institute for Cereal Crops Improvement School of Plant Sciences and Food SecurityGeorge S.Wise Faculty of Life SciencesTel Aviv UniversityTel AvivIsrael

Aims Climate change in the eastern Mediterranean region will have a strong impact on ecosystem functioning and plant community dynamics due to a reduction in annual rainfall and increased *** aim to understand the role of seed banks as potential buffers against climatic uncertainty determined by climate *** We examined germination strategies of 18 common species present along an aridity *** were obtained from soil seed banks germinated during nine consecutive years from arid,semi-arid,Mediterranean and mesic Mediterranean *** the semi-arid and Mediterranean sites,rainfall manipulations simulating 30%drought and 30%rainfall increase were *** strategies were tested under optimal irrigation conditions during three consecutive germination seasons to determine overall seed germinability in each soil *** in germination strategy were examined using a novel statistical approach that considers the climatic and biotic factors that may affect seed *** Findings The results showed that dominant species controlled their germination fractions by producing seeds with a different yearly germination fraction *** amount of rainfall under which the seeds were produced led to two major seed types with respect to germinability:high germinability,seeds leading to transient seed banks,and low germinability,seeds leading to persistent seed *** conclude that differential seed production among wet and dry years of both seed types creates a stable balance along the aridity gradient,enabling the soil seed bank to serve as a stabilizing mechanism buffering against rainfall ***,we present a general model of germination strategies of dominant annual species in Mediterranean and arid ecosystems that strengthens the notion of soil seed banks as buffers against climatic uncertainty induced by climate change in the region.

关键词： climate change desert drought Mediterranean rainfall manipulations seed bank

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