title: [Pollen assemblage and palaeo-vegetation of Late holocene fen in Dunhua of Jilin Province].
abstract: Based on the study of pollen, stratum and 14C dating of Daqiao fen in Dunhua of Jilin Province, four pollen zones were distinguished, i.e., Pinus-Picea-Abies assemblage (2195 +/- 70 to appromimately 2045 +/- 70 B. P., Carex-Pinus-BetulaCorylus-Juglans assemblage (2045 +/- 70 to appromimately 1745 +/- 70 B.P.), Pinus-Corylus-Carpinus-Carex-Ranunculus assemblage (1745 +/- 70 to appromimately 705 +/- 70 B.P.), and Pinus-Picea-Abies-Betula-Carex assemblage (705 +/- 70 to appromimately 1950 AD). The vegetation changed from coniferous forest (similar to the vegetation currently foundover 1100 m a.s. 1. in this area), through conifer-broad-leaved mixed forest (similar to the vegetation currently found between 400-600 m a.s.l.) and conifer-broad-leaved mixed forest (similar to the vegetation currently found between 600-800 m a.s.l.), to conifer-broad-leaved mixed forest (similar to the vegetation currently found between 800-1100 m a.s.l.). Accordingly, Daqiao fen underwent the periods of gestation, fast development, expansion, and dieing out.
authors.affiliation: Key Laboratory for Ecological Restoration & Ecosystenm Management of Jilin Province, Northeast Normal University, Changchun 130024, China. hyzhao@nenu.edu.cn
authors.forename: Hongya
authors.initials: H
authors.lastname: Zhao
authors.forename: Daowei
authors.initials: D
authors.lastname: Zhou
mesh_terms: D002681:China; D017753:Ecosystem; D005580:Fossils; D010163:Paleontology; D011058:Pollen; D012987:Soil / Q000032:analysis*; D014197:Trees / Q000145:classification*
chemical_list: D012987:Soil