A New Species of Tsuga(Pinaceae) based on Lignified Wood from the Late Miocene of Central Yunnan, China, and Its Paleoenvironmental Implications  

作　　者：WANG Haobo Olesia V.BONDARENKO Frédéric M.B.JACQUES WANG Yuehua ZHOU Zhekun 

机构地区：[1]Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences [2]School of Life Science, Yunnan University [3]College of Agriculture and Bioscience, Dali University [4]University of Chinese Academy of Sciences [5]Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences [6]Institute of Biology and Soil Science, Far Eastern Branch, Russian Academy of Sciences

出　　处：《Acta Geologica Sinica(English Edition)》2015年第5期1429-1439,共11页地质学报（英文版）

基　　金：supported by a 973 program of the Ministry of Science and Technology (Mo ST) of China (20120CB821900);the National Natural Science Foundation of China (grants 41272007, 41030212, 31350110504);the Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany;the Chinese Academy of Sciences (KLBB 201201 and 2013Y1SA002);part of the NECLIME (Neogene Climate of Eurasia) network

摘　　要：A new species, Tsuga nanfengensis sp.nov.（Pinaceae）, is described on the basis of lignified fossil wood from the late Miocene of the Xianfeng Basin, central Yunnan, southwestern China.Detailed observation of the fossil wood specimens show the following characteristics： distinct growth rings, absence of resin canals, uniseriate bordered pits in the radial wall of tracheids, ray tracheids and piceoid and cupressoid cross-field pits.These features indicate similarities to the wood of extant Tsuga canadensis, T.chinensis, and T.dumosa.According to the fossil record, Tsuga was present in Xundian County during the Miocene.Today Tsuga is drought intolerant, preferring wet conditions with no extant species growing naturally in Xundian County.The presence of Tsuga in the Miocene of Xundian County indicates a humid climate consistent with previous palaeoclimatic reconstructions showing a wetter and probably shorter dry season in the Miocene, relative to the present day.Therefore, the change in the local climate such as increasing aridity through the Miocene might explain the local extinction of Tsuga from central Yunnan.A new species, Tsuga nanfengensis sp.nov.（Pinaceae）, is described on the basis of lignified fossil wood from the late Miocene of the Xianfeng Basin, central Yunnan, southwestern China.Detailed observation of the fossil wood specimens show the following characteristics： distinct growth rings, absence of resin canals, uniseriate bordered pits in the radial wall of tracheids, ray tracheids and piceoid and cupressoid cross-field pits.These features indicate similarities to the wood of extant Tsuga canadensis, T.chinensis, and T.dumosa.According to the fossil record, Tsuga was present in Xundian County during the Miocene.Today Tsuga is drought intolerant, preferring wet conditions with no extant species growing naturally in Xundian County.The presence of Tsuga in the Miocene of Xundian County indicates a humid climate consistent with previous palaeoclimatic reconstructions showing a wetter and probably shorter dry season in the Miocene, relative to the present day.Therefore, the change in the local climate such as increasing aridity through the Miocene might explain the local extinction of Tsuga from central Yunnan.

关 键 词：TSUGA fossil wood PALAEOCLIMATE late Miocene YUNNAN 

分 类 号：Q914[天文地球—古生物学与地层学] P534.621[生物学—古生物学]