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Influence of smoke, heat and fire on germination of woody species occurring in the dry valleys of southwest China

Journal of Plant Ecology 2019年第6期12卷 931-940页

作者： Mareike Roeder Weidong Yang Kyle W.Tomlinson Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunMenglaYunnan 666303China Institute of Floodplain Ecology Karlsruhe Institute of TechnologyJosefstraße 1D–76437 RastattGermany

Aims Savannahs depend on fire for their *** influences regeneration from seeds in several ways:it converts the environment into a more open space which can benefit the establishment of seedlings,and fire itself can also enhance germination by chemical and physical cues,such as smoke and *** is limited information as to how seed of Asian savannah species respond to fire,even though Asia has several dry vegetation types that are associated with *** main question was whether fire enhances or triggers the germination of woody species occurring in southwest Chinese dry valleys,which have savannah *** We conducted tests with heat(80°C)and smoke solution treatments,and tests with real fire by burning grass on top of sand trays containing *** tested 35 species,including savannah species,and gully and forest *** on seed availability,not all species were tested for all ***-six species had total germination>4%and these were used for *** Findings Heat increased germination of three species(strongest reaction:Dodonaea viscosa),smoke increased germination of five species(strongest reaction:Calotropis gigantea).Both treatments decreased germination for five and seven species,*** fire was detrimental for most species,except for ***,which is known to respond positively to heat *** though fire-related cues were not a trigger for germination for most species in our study,fire could still be crucial for regeneration by competition release.

关键词： smoke water burning biomass germination time Dodonaea viscosa Calotropis gigantea seed mass water content dark germination

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