The impacts of global changes on the natural environment of the polar regions have been observed and investigated by scientists over recent decades. For example, the melting of glaciers and the changes induced in both...The impacts of global changes on the natural environment of the polar regions have been observed and investigated by scientists over recent decades. For example, the melting of glaciers and the changes induced in both the global carbon cycle and the freeze-thaw cycle of the polar regions due to global warming have exerted pressure on the polar environment. Furthermore, the warming climate, changes in hydrological conditions, and changes to the rates of methane and nitrous oxide production and respiration in different types of soil have also constituted a challenge to polar region ecosystems.展开更多
The present article deals with the use of tree barks as a natural trap for airborne spores and pollen grains in China.The study carried out at the southern part of Beijing Botanical Garden,Institute of Botany,Chinese ...The present article deals with the use of tree barks as a natural trap for airborne spores and pollen grains in China.The study carried out at the southern part of Beijing Botanical Garden,Institute of Botany,Chinese Academy of Sciences has yielded a variety of palynomorphs mostly belonging to tree taxa.New methodologies for extraction of palynomorphs from tree barks have been suggested.Bark samples were collected from three taxa,i.e.,Paulownia fortunei Hemsl.(Scrophulariaceae),Quercus dentata Thunb.(Fagaceae),and Picea meyeri Rehder&E.H.Wilson(Pinaceae)having different bark morphologies.P.fortunei with a comparatively soft and fissured bark is believed to have a greater potential for trapping airborne spores and pollen grains compared to the stiff and less fissured barks of Q.dentata and the scaly bark of P.meyeri.Old barks yield better data in terms of quantity and quality of trapped pollen and spores.The present study throws new light on the modern pollen rain,spore-pollen dispersal,and their deposition in and aroundBeijing Botanical Garden,and other different parts of China.展开更多
文摘The impacts of global changes on the natural environment of the polar regions have been observed and investigated by scientists over recent decades. For example, the melting of glaciers and the changes induced in both the global carbon cycle and the freeze-thaw cycle of the polar regions due to global warming have exerted pressure on the polar environment. Furthermore, the warming climate, changes in hydrological conditions, and changes to the rates of methane and nitrous oxide production and respiration in different types of soil have also constituted a challenge to polar region ecosystems.
基金supported by the National Key Basic Research Program of China (2014CB954201)the National Natural Science Foundation of China (41271222)+1 种基金the Chinese Academy of Sciences Visiting Professorship for Senior International Scientists (90004F1005)the visiting scholarship funded by China Scholarship Council (CSC)
文摘The present article deals with the use of tree barks as a natural trap for airborne spores and pollen grains in China.The study carried out at the southern part of Beijing Botanical Garden,Institute of Botany,Chinese Academy of Sciences has yielded a variety of palynomorphs mostly belonging to tree taxa.New methodologies for extraction of palynomorphs from tree barks have been suggested.Bark samples were collected from three taxa,i.e.,Paulownia fortunei Hemsl.(Scrophulariaceae),Quercus dentata Thunb.(Fagaceae),and Picea meyeri Rehder&E.H.Wilson(Pinaceae)having different bark morphologies.P.fortunei with a comparatively soft and fissured bark is believed to have a greater potential for trapping airborne spores and pollen grains compared to the stiff and less fissured barks of Q.dentata and the scaly bark of P.meyeri.Old barks yield better data in terms of quantity and quality of trapped pollen and spores.The present study throws new light on the modern pollen rain,spore-pollen dispersal,and their deposition in and aroundBeijing Botanical Garden,and other different parts of China.
