摘要
将费希尔(Fisher)最优分割法引入到临夏盆地早更新统东山组地层孢粉带的划分中,结合地层特征,共划分出了3个孢粉带。这3个孢粉带分别为:带Ⅰ(深度78.5～45.5m)柏科-禾本科组合带、带Ⅱ(深度45.5～12.5m)云杉属-榆属-禾本科组合带、带Ⅲ(深度12.5～0.5m)云杉属-禾本科组合带。孢粉带分带揭示,临夏盆地早更新世气候变化经历了干-湿-干3个阶段,这一结果同以往获得的粒度、碳酸钙和Cl-等无机指标高分辨率分析结果相一致。
Based on the characteristic of strata, Fisher best division of ordinal samples was used to divide 3 sporepollen zones of a early Pleistoeene strata in Linxia Basin. These spore-pollen zones were Cupresseeae and Gramineae Zone （Zone Ⅰ in depth 78.5-45.5 m）, Pieea, Ulmus and Gramineae Zone （Zone Ⅱ in depth 45.5- 12.5m ） and Pieea and Gramineae Zone （Zone Ⅲ in depth 12.5-0.5 m） . The division result indicates that the early Pleistocene climatic evolution in Linxia Basin underwent three periods： dry-humid-dry, which was consistent with previous results obtained from inorganic proxies such as grain size, CaCO3 and Cl^-.
出处
《云南地理环境研究》
2007年第2期12-16,共5页
Yunnan Geographic Environment Research
基金
国家自然科学基金委青年科学家群体研究项目"亚洲季风与干旱环境系统耦合过程和发展趋势"(40121303).
关键词
费希尔最优分割法
孢粉带
临夏盆地
Fisher best division, Spore-pollen Zones, Hnxia Basin
