摘要
采用孢粉分析及^(14)C测年,本文认为大连沿海分布的泥炭层主要形成于中全新世中晚期及晚全新世早期的暖湿、温湿气候下富营养性湖沼环境。属草本植物为主的草本-木本型泥炭,沉积速度一般为0.7—1.1mm/a。全新世海侵,在辽宁海岸带约距今7000年以前达最大范围。近5000年来,海面在下降过程中有波动和稳定时期。
Dalian Region belongs to a wet and semi-wet monsoon climate of warm-temperate zone with an annual average temperature between 8 and 10 centigrade,and an annual precipitation of 550-10(0 mm.There is a landscape of the conifer and broadleaf forest.The natural forest with pine and oak, ect. is only found in the lower mountainous and hilly areas. Coastal zone has been developed earlier and most of them have become farmlands I . Deposit Environment of PeatThe alongshore peat was mostly deposited in the nutritional cacustrine-swamp environment under the warm-temperate wetted climate from middle-late stage of middle Holocene to early stage of the late Holocene. It belongs to herb-xylophyta type mainly with herbaceous plant and generally the depositiny rate is about 0.7-1.1 mm/a.(1).Peat in the Early HoloceneThe lacustrines-swamp peat formation in the Pulandian intermountainous basin was formed from 9950+ ( - )300 to 8087+ (-) 190 a B.P.. It was the scattered conifer-broadleaf mixed forest grassland, and warm-dry climate of the early post-glacial period.(2).Peat in the Middle HoloceneThe peat formation in the Qianqia depression of Zhujiatun was formed between 5649 + ( - )75 and 4949+( - )73 a B.P.. By sporepollen combination it is divided into three stages as follows.The first stage is forest-grassy marshland.The second is the deciduous broadleaf-grassy marshland with the climate from warm-wet to temperate-wet, which is the major deposited stage of peat.The last is also the forest-grassy marshland, but climtely,it is transferred from temperate-wet to temperate-dry .(3).Peat in the Late HoloceneThe peat in Danandao was mainly deposited from 2435 +( - ) 100 to 2050 + ( - )95 a B.P..II .Sea-Level FluctuationTransgression in the Holocene reached up to the largest altitude of the cower ing coastal zone, 7000 a B.P.. During 6000-56000 a B.P.,it became temperate-dry climate and sea-level cowering, in the recent 5000 yrs, fluctuation and static periods occurred during the sea-level cowering.
出处
《地理研究》
CSSCI
CSCD
北大核心
1992年第4期38-46,共9页
Geographical Research
基金
国家自然科学基金948807号
中国科学院87-45-03号重大项目
