Acta Botanica Yunnanica 

About: Acta Botanica Yunnanica is an academic journal. The journal publishes majorly in the area(s): Genus & Population. It has an ISSN identifier of 0253-2700. Over the lifetime, 1371 publications have been published receiving 5183 citations.

A preliminary floristic study on the seed plants from the region of hengduan mountain

Abstract: The region of Hengduan mountain is a very natural region in floristic nature Its seed plants' flora is abundant in species, genera and families, complex in geographical elements, striking in endemism and vicariance, and basically temperate in nature According to the degree of abundance in endemic species and some physiographical features, the region can be floristically divided into three subregions: subregion of NW Yunnan and SW Sichuan, subregion of NW Sichuan to SW Gansu and SE Qinghai, as well as subregion of E to SE Xizang Based on the analysis of its floristic elements, the region is certainly a knot for clarifying the questions about the relationships between the florogenesis and the plate-fectonics, about the origin of the North temperate flora including that of E Asia, N America and Europe

Tethys Retreat and Himalayas-Hengduanshan Mountains Uplift and Their Significance on the Origin and Development of the Sino-Himalayan Elements and Alpine Flora

Abstract: The flora of Himalayas Hengduanshan Mountains started in late Cretaceous and early PaleogenePaleobotanical data had showed that the flora of Himalayas Hengduanshan Mountains was a part of Tethyan Tertiary Flora or evergreen,laurophyll "paleotropical geoflora" in that timeAfter late Paleogene,along with climate of the Mediterranean gradually become aridity,the laurophyll "paleotropical geoflora" gradually replaced by semiarid or arid flora of the MediterraneanThe Tethyan Tertiary Flora was only conserved and developed in E Asian for monsoon climate bringing ample summer rain up to todayTherefore,most of subtropical evergreen broad leaved forest occurring in Himalayas Hengduanshan Mountains are the descendant of the Tethyan Tertiary FloraAfter Neogene,the Himalayas Hengduanshan Mountains uplifted caused the semiarid or arid flora of Mediterranean turning to adapt to alpine environment and gradually differentiated and developed in these regionsThrough analysis of the origin of sclerophyllus oaks forest in Himalayas Hengduanshan Mountain and the Euroasian disjunction in some examples: Helleborus,Meconopsis,Acanthochlamys,Notholirion and Coriaria ,as well as the descendants of Tethyan flora,such as Piptanthus,Lamiophlomis,Notochaete,Phyllopnyton ,exsiting in the regions,showed that quite a part of Sino himalayan elements and modern alpine plants of Himalayas Hengduanshan Mountains originated from the semiarid or arid flora of Mediterranean

The Areal-types of the World Families of Seed Plants

Abstract: The areal-type means distribution map of certain plants always same or nearly same. This is an important method in floristic research to divide distribution into different areal-types.More than 3116 genera of seed plants have been recorded in China.They have been classified into 15 areal-types and 37 subtypes.The certain number represent certain areal type such as number 2 always means pantropic distribution pattern.After repeated to tests and uses,it has been proved that characteristics and relationships of each areal type can be showen by such classification.A classification precept of families of seed plants of the world has been proposed at present paper.The families of seed plants of the world can classified into 18 areal types and 74 subtypes.Among these areal-types,areal-types 1 to 15 are coincidence with those of Chinese seed plants.Areal-type 16-18 are the kinds of distribution pattern which can not be found in China.A distribution patterns of world families of seed plants is listed at present paper as well.This classification is a key to help us to understand development of flora of seed plants of the world and become a base of regionalization of world flora.

The Fossil History of Quercus

Abstract: The evolution of plant ecosystems during the Cenophytic was complex and influenced by both abiotic and biotic factors. Among abiotic forces were tectonics, the distribution of continents and seas, climate, and fires; of biotic factors were herbivores, pests, and intra- and interspecific competition. The genus Quercus L. (Quercoideae, Fagaceae) evolved in this context to become an established member of the plant communities of the Northern Hemisphere, commencing in the Paleogene and spreading to a diverse range of environments in the later Cenozoic. Its palaeontological record, dominated by leaves and pollen, but also including wood, fruits and flowers, is widespread in Eurasia and North America. Consequently, a great number of species have been described, from the 19th century to the present day. Although Quercus is currently an ecologically and economically important component of the forests in many places of the Northern Hemisphere and Southeastern Asia, no comprehensive summary of its fossil record exists. The present work, written by an international team of palaeobotanists, provides the first synthesis of the fossil history of the oaks from their appearance in the early Paleogene to the Quaternary.

Origin, phylogeny and dispersal of quercus from china

Abstract: Origin, phylogeny and dispersal of Quercus from China were discussed based on studies of phylogeny, fossil history and modern distribution of Quercus According to Takhtajan's view point of regionlizatiton of the world flora, a number of species in every region of the world were counted as follows: Caribbean region with 134 species belonging to one subgenus and three sectitons (3/1), Indo-Chinese region 118(3/2) and east Asian region 97(3 / 2) Above regions are abundant in a number of species and can be considered as the centres of majority In conjunction with considering their phylogenetic relationships and fossil history Indo-Chinese region would be however the centre of distribution and speciation and could be original place of Quercus Original time of Quercus was suggested in early Plaeogene based on the fossil history of Quercus Trigonobalanus has been recognized as probable ancestor of Quercus After the emergence of Quercus on the earth, two large groups, subg Cyclobalanopsis and subg Quercus were first derived Subg Cyclobalanopsis mainly developed and dispersed insoutheasten Asian They dispersed not beyoned "the line of Wallace "forward to southeast and reached the line of Qinling moutain to Huaihe river forward to north Two groups were evolved, sect Brachylepides and sect Engleriana, after the emergence of subg Quercus Sect Brachylepides, the oldest group in subg Quercus, mixed in broad evergreen forest at first and then developed and becomed dominant in Hengduan Mountain with the Tethys withdrawing and Himalayas rising since the Miocene because of adapted to dry enviroment Deciduous oaks could be evolved from sect Echinolepides via sect Engleriana and then two sections, sect Quercus and sect Aegilops, were derived These sections dispersed in North Temperate, reaching 62 degrees north latitude in northwesten Europa and 52 degrees north latitude in northeast Deciduous oaks dispersed to subtropical area and tropical mountains when the glacier came and climate became cold in the earth Oaks dispersed to North America by two routes: 1) from Tethyan region migrating across the middle Atlantic before the late Eocene, this group could be sect Protobalanus, evolving from sect Brachylepides via QilexThis section is held to be primitive among American oaks; 2) across the Asia-Bering land bridge after the Miocene Sect Quercus could take this route In short Quercus was evolved from Trigonobalanus in tropic mountains of Indo-Chinese region in the early Paleocene and then dispersed to other areas from this region