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High leaf area index expands the contrasting effect of climate warming on western siberia taiga forests activity before and after 2000

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Journal of Geographical Sciences 2024年第1期34卷 131-145页

作者： SUN Han WANG Xiangping State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry UniversityBeijing 100083China School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China

The taiga vegetation in western siberia has been seriously threatened by climate warming in recent decades.However,how vegetation in different growing states and climate conditions responds to climate changes differently is still unclear.Here we explore the vegetation activity trends in western siberia taiga forests using the annual rate of change in leaf area index(LAI)during 1982–2018 so as to answer two questions:(1)how did climate warming affect taiga vegetation activity in the recent last decades?(2)Did the growing state of taiga forest affect its response to climate warming?Our results revealed that climate warming promoted taiga vegetation activity in western siberia before 2000.However,continuous warming caused excessive evapotranspiration and led to decreased vegetation activity after 2000.Moreover,the intensity of vegetation growth response to warming was positively related to canopy height and LAI,indicating that both the positive and negative effects of warming were more significant in taiga forests in better growing state.Since these forests generally have higher productivity and play more important roles in ecosystem functioning(e.g.,carbon sink and biodiversity conservation),our results highlight their vulnerability to future climate change that need more research attention.

关键词： climate warming taiga forest leaf area index(LAI) vegetation activity western siberia

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First Asian record of Panthera(Leo)fossilis(Mammalia,Carnivora,Felidae)in the Early Pleistocene of western siberia,Russia

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Integrative Zoology 2014年第4期9卷 517-530页

作者： Marina V.SOTNIKOVA Irina V.FORONOVA Geological Institute of Russian Academy of Sciences MoscowRussia V.S.Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of SciencesNovosibirskRussia

A lion-like pantherine felid is described as Panthera(Leo)fossilis from the late Early Pleistocene sediments of the Kuznetsk Basin(western siberia,Russia).The find of P.fossilis first recorded in Asia considerably extends the current notion of the eastward expansion of the most ancient lions.The siberian lion is geologically the oldest form and is dimensionally among the largest members of the group of fossil lions on the Eurasian continent.Although known by mandibular remains only,it is readily distinguished from Panthera(Leo)spelaea by a heavy built mandibular corpus with rectangular profile in the cheek teeth area,a deep,well-outlined and narrow anterior section of the masseteric fossa,and a largeр4 supported by a big unreduced anterior root.The siberian lion shares these features with the European Middle Pleistocene P.fossilis and the American Late Pleistocene P.(Leo)atrox,which suggests their close relationship.P.atrox originated from P.fossilis and was isolated in North America south of the Late Pleistocene ice sheets.This explains why the American lion has retained more primitive features than the coeval Eurasian cave lion P.(L.)spelaea.

关键词： Early Pleistocene evolution Panthera fossilis relationships western siberia

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