摘要
A pollen record from Haiyuan section in the southern part of Ningxia revealed a detailed history of vegetation variation and associated climate changes during the period from^13.0 to^7.0 14 C ka BP.A steppe landscape under a moderately dry(and probably cool)condition(~12.7-~12.1 14 C ka BP)was replaced by a coniferous forest dominating the landscape under a generally wet climate from^12.1 to ~11.01 4C ka BP.This generally wet period,corresponding to the European B?lling/All?rod period,can be divided into three stages:a cool and wet stage between^12.1 and^11.4 14 C ka BP,a mild and rela- tively dry stage between^11.4 and^11.2 14 C ka BP,and a mild and wet stage between^11.2 and^11.0 14 C ka BP.The coniferous forest-dominated landscape was then deteriorated into steppe landscape (~11.0-~10.6 14 C ka BP)and further into a desert steppe landscape from^10.6 to^9.8 14 C ka BP,being correspondent to the European Younger Dryas period.After a brief episode of a cool and wet climate (~9.8-~9.6 14 C ka BP),a relatively mild and dry condition prevailed during the early Holocene(~9.6- ~7.6 14 C ka BP)and then a warm and humid climate started the mid-Holocene(~7.6-~7.2 14 C ka BP).
A pollen record from Haiyuan section in the southern part of Ningxia revealed a detailed history of vegetation variation and associated climate changes during the period from -13.0 to -7.0 ^14C ka BP. A steppe landscape under a moderately dry （and probably cool） condition （-12.7--12.1 ^14C ka BP） was replaced by a coniferous forest dominating the landscape under a generally wet climate from -12.1 to -11.0 ^14C ka BP. This generally wet period, corresponding to the European Boelling/AIlerod period, can be divided into three stages： a cool and wet stage between -12.1 and -11.4 ^14C ka BP, a mild and relatively dry stage between -11.4 and -11.2 ^14C ka BP, and a mild and wet stage between -11.2 and -11.0 ^14C ka BP. The coniferous forest-dominated landscape was then deteriorated into steppe landscape （-11.0--10.6 ^14C ka BP） and further into a desert steppe landscape from -10.6 to -9.8 ^14C ka BP, being correspondent to the European Younger Dryas period. After a brief episode of a cool and wet climate （-9.8--9.6 ^14C ka BP）, a relatively mild and dry condition prevailed during the early Holocene （-9.6- -7.6 ^14C ka BP） and then a warm and humid climate started the mid-Holocene （-7.6--7.2 ^14C ka BP）.
基金
Supported by the National Natural Science Foundation of China(Grant Nos.40331012 and 40421101)and NSF(Grant Nos.EAR 04-02509 and BCS 06-23478)
关键词
中国
宁夏南部
花粉记录
气候变化
植被
历史
pollen record, vegetation history, climate changes, southern Ningxia
