云南中部杞麓湖地区晚更新世——全新世植被研究

A STUDY OF LATE PLEISTOCENE TO HOLOCENE.VEGETATION IN JILULAKE AREA OF CENTRAL YUNNAN

根据植被及C^14资料,本文将杞麓湖水下沉积物分为6个花粉带,其沉积年代及气候如下: 1.11.00--9.40m(水下沉积物深度,下同)松—油杉、冷杉、云杉、铁杉—栎针阔叶混交林带。气候冷湿。距今约3000—15000年,晚更新世(大理冰期最盛期)。 2.9.40—7.OOm 稀疏松-栎林带。气候干凉。距今约15000-12350年,晚更新世晚期(大理冰期冰后期)。 3.7.00-4.80m 松-油杉-栎、榆针阔叶林繁盛带。气候温暖。距今约12350-9500年,早全新世(前北方期-北方期)。 4.4.80-3.OOm 松-柏-栋、桦针阔叶林继续繁盛带。气候暖湿。距今约9500-5500年,中全新世(大西洋期-亚北方期) 5.3.00--0.84m 松-油杉-栎,以针叶树为主的针阔叶林带。气候温凉略干。距今约5000-1600年,晚全新世(亚大西洋期)。 6.0.84--O.OOm 稀疏松林。约1600年至今。本带森林面积迅速减小,可能由于人类的生产和生活活动所致,尚有待进一步研究。

According to the vegetation change and C data, this paper divides the subaqueous sediments in the Jilulake into ti pollen zones and discusses its sedi-mentary chronology and climate. 1. Underground 11.00—9.40m In which the pinus-Keteleeria, Abies, Picea, Tsuga-Quercus, Conifer and broad-leaf mixed forest zone developed, with cold and moist climate, 30000—15000y. BP, corrsponding to the Upper Pleistocene (the glaciation limit of the Dali glacial age). 2. 9.40—7.00m The Pinus-Quercus forest zone appeared, indicating a dry cool climate, 15000—12350 y.Bp, corresponding to the late Upper Pleistocene (late in the Dali glacial age). 3. 7.00—4.80m The Pinus-Keteleeria-Quercus, Ulmus, Conifer and broad-leaf mixed forest zone flourished, showing a warm climate, 12350—9500 y. BP, equivalent to the Lower Holocene(Preboreal—Boreal). 4. 4.80—3.00m The Pinus-Cupressaceae-Quercus, Betula, Conifer and broad-leaf mixed forest zone continually florished, marking a warm-moiat cli-mate, 9500—5500 y.BP, near the Middle Holocene(Atlantic-Subboreal ages). 5. 3.00—0.84m The Conifer alul broad-leaf forest zone of the Pinus-heteleeria-Quercus occurred, taking the Conifer as the dominant zone, repre-senting a warm cool and slightly dry climate, 5500—1600 y.BP, congruent the Upper Holocene(Subatlantic age). 6. 0.84—0.00m Only aparse Pinus forest zone grown, 1600 y. BP. up to pre-sent. In that period, the forest area rapidly decreased probably resulting from the production and life activities of the mankind, it remains to be studied.