LATE HOLOCENE VEGETATION SUCCESSION,CLIMATE CHANGE,AND FIRE HISTORY IN WESTERN GUIZHOU
Western Guizhou is located in the humid and sub-humid climate region of Yunnan-Guizhou Plateau in the northern subtropical region.The southwest monsoon is the main climate system of water vapor source in this region.The Niangniang Mountain(26°34′40″～26°36′38″N,104°45′29″～104°48′45″E)in Liupanshui,Guizhou Province,has a continuous distribution of peat swamp deposits,which provides a relatively complete record of past vegetation and climate history,and is an ideal place to study the change of climate,vegetation,fire and human activities.In this paper,the upper 52 cm of the NNS core(26.10° N,104.82° E)obtained from the peat wetland at altitude of 1999 m in Niangniangshan Mountain was selected for AMS 14C dating,pollen and charcoal analysis to reconstruct the history of vegetation succession and fire activity under the influence of climate change and human activities during the Late Holocene.The results show that during the period of 3500～3100 cal.aB.P.,the local subtropical evergreen broad-leaved forest flourished,and the fire activity was mainly controlled by climate,but the fire activity did not change the overall appearance of the broad-leaved forest;during the period of 3100～600 cal.aB.P.,the climate showing a drying trend,the broad-leaved woody plants decreased significantly,and the local vegetation changed from subtropical evergreen broad-leaved forests to coniferous sparse forests and grasslands,which was most likely the result of a cold and dry climate;after ca.600 cal.aB.P.,the local vegetation changed to open forests,accompanied by the appearance of large charcoal(＞125 μm)and the significant increase of human-associated pollen,indicated that the intensive slash-and-burn cultivation of human agricultural activities have expanded to higher altitudes in mountainous areas.Regional comparison shows that the southwestern region has been mainly affected by regional fires since 3500 cal.a B.P,while the fire activity has been influenced by both dry climate and human activities.Eespecially since 600 cal.a B.P.,human activities(slash-and-burn)probably have become the main factor in local fires and vegetation replacement.
Western Guizhoumountain peatpollencharcoalvegetation successionhuman activitiesLate Holocene
万方数据
维普
