干旱区石羊河终闾湖泊孢粉组合中云杉圆柏属环境指示意义探讨   总被引：8，自引：3，他引：8  

朱艳  陈发虎  施祺  颉耀文 《中国沙漠》2001,21(2):141-146

河西走廓东段、石羊河终闾湖泊边缘的三角城剖面下部全新世早期至末次冰消期的292-600cm处155个样孢粉组合显示云杉、圆柏属含量极高，两者之和达40%-60%左右，且百分比互为消长，通过对云杉、圆柏属生态习性、传播性能、与其它组分关系、当地特殊的自然地理条件和表土花粉记录的综合分析，笔者认为剖面中高含量的云杉、圆柏属来自流域上游祁连山，是石羊河搬运的结果，两者含量与区域有效湿度关系密切，云杉丰值指示湿润，圆柏丰值指示干旱。  相似文献   

内蒙古东乌珠穆沁旗西山巴润特花组孢型化石及其时代   总被引：1，自引：0，他引：1  

高联达 《华北地质矿产杂志》1996,11(1):24-30,T002

本文首次报道内蒙古东乌珠穆沁旗西山下泥盆统巴润特花组底部所发现的丰富的孢型石。共发现孢子１８属，３９种，其中新种２个；凝类４属５种，通过孢型化石的研究，确定巴润特花组为早泥盆世早期，相当西欧吉丁阶，并可与中国云南东部，四川龙门山，西秦岭和新疆西准噶尔同时期孢带比较。  相似文献   

The landscape factor in the formation of pollen records in lake sediments     

J.-M. Punning  T. Koff 《Journal of Paleolimnology》1997,18(1):33-44

Comprehensive paleobotanical and geochemical methods have been used to study the relationship between the spatial scale of landscape development and values of pollen influx to take the bog sediments. The spatial-temporal history of the four lakes and a bog was established in NE Estonia and pollen analyses of thier sediment were made. It was found that the influx of total arboreal pollen directly corresponds with the sizes of the sites studied, and varies with thier expansion or reduction.  相似文献   

南海北部周边地区倒数第二次冰期—末次间冰植被演化   总被引：9，自引：0，他引：9  

罗运利  孙湘君 《海洋地质与第四纪地质》2003,23(1):19-26

为了研究倒数第二次冰期旋回(氧同位素6/5期)中的环境变迁,对南海北部大洋钻探(ODP)1144站(20°3.18′N、 17°25.14′E, 水深2 037 m)总共385个孢粉样品进行了分析研究,时间分辨率为530 a/样.孢粉谱的主要特征是松属花粉和草本植物花粉百分含量交替占优势,并且大致和冰期旋回对应间冰期时松属花粉占优势,冰期时草本植物花粉占优势.详细的对比表明,在氧同位素6/5期的冰期-间冰期过渡阶段,孢粉组合的变化要早于氧同位素记录指示的冰盖体积的变化,表明中低纬度地区气候变暖早于冰盖后退.还讨论了孢粉组合变化对轨道和亚轨道旋回以及季风变化的响应.  相似文献   

我国某些红树植物花粉形态研究及其古环境意义   总被引：3，自引：0，他引：3  

张玉兰  王开发 《海洋地质与第四纪地质》2002,22(4):29-35

对我国11科11属14种（除红树科和海桑属之外）红树植物花粉形态作了光学显微镜的各种数据测定，并在扫描电镜下观察和摄片研究。这14种红树植物花粉是海榄雌，水芫花，水椰，榄李，红榄李，银叶树，小花老鼠勒，老鼠勒，海漆，杨叶肖瑾，玉蕊，桐花树，尖叶卤蕨，卤蕨，红树植物是热带-亚热带海岸潮间带的一种特有的指示植物，根据沉积物中出现的红树植物花粉种类和数量，可推测海滨红树林的演化，海面升降，海岸线变迁，追溯古海流和沉积物来源。  相似文献   

Dust pollen distribution on a continental scale and its relation to present-day vegetation along north-south transects in east China   总被引：1，自引：0，他引：1  

P. COUR  D. DUZER  G. ROBERT  M. CALLEJA  C. BEAUDOUIN 《中国科学D辑(英文版)》2007,50(2):236-246

A series of dust pollen samples was collected along N-S transects in east China (18°N to 53°N latitudes). Sample sites extend from the cold-temperate zone in the north to the tropical region in the south. Pollen taxa characterize each region and reflect the natural and devastated vegetation as well as corre- sponding climatic zones. The quantitative pollen data can be used to estimate the spatial distribution of planted and introduced species. Valuable information of human disturbance of the natural forest is evaluated by quantitative comparison between dust pollen and in-situ pollen of protected forest. In addition, percentages of grass pollen vary regularly from north to south that is consistent with spatial distribution of net primary productivity in east China. Among all grasses, Artemisia and the Gramineae carry the clearest signal: their ratio increases northwards and therefore represent a suitable and con- venient tool for palaeoclimate reconstructions.  相似文献   

青藏高原北部孢粉记录的全新世以来环境变化   总被引：3，自引：1，他引：3  

赵振明  刘爱民  彭伟  计文化  李荣社  王毅智  朱迎堂 《干旱区地理》2007,30(3):81-391

根据青藏高原北部同纬度地区,同一个垂直自然带内的西藏羊湖的湖相沉积、青海昆仑河河流相沉积、青海豆错(苦海)湖的湖相沉积记录的全新世以来孢粉(spore-pollen)资料的对比分析,表明:①极度干旱荒漠区的代表植被麻黄属(Ephedra)花粉平均百分含量,三个地区分别为:7.7%,4.2%,7.5%,总体上,羊湖地区的数值高于昆仑河地区与苦海地区。②代表气候湿润的禾本科(Gram ineae)花粉平均百分含量,三个地区分别为:1.2%、4.9%、12.0%,从西向东数值逐渐升高。③代表气候湿润的蒿属(Artem isia)花粉平均百分含量,三个地区分别为:22.2%,43.6%,48.8%,从西向东数值逐渐升高。④代表气候干旱的藜科(Chenopod iaceae)花粉平均百分含量,三个地区分别为:52.1%,42.4%,11.5%,从西向东数值逐渐降低。⑤依据蒿属、藜科花粉百分含量,计算出环境变化指标,蒿属/藜科(A/C)值,三个地区的平均值分别为:0.45,1.23,5.59,从西向东比值逐渐升高,⑥麻黄属/蒿属值,在全新世晚期,三个地区都呈上升趋势,但幅度存在差异,分别为:0.45,0.34,0.28,从西向东数值逐渐降低。综观上述6个方面的变化规律,青藏高原北部全新世以来,干旱的程度从西向东逐渐降低;对青藏高原北部东西方向现今植被和环境的实际考察并结合上述变化规律,未来高原北部干旱变化的趋势将继续由西向东推移。  相似文献   

A discontinuous Late Cenozoic vegetation record from a maar crater in Auckland, New Zealand     

M. Horrocks  S. L. Nichol  D. C. Mildenhall  I. Lawlor 《New Zealand geographer》2007,63(1):5-17

Abstract:  Presented here are results of analyses of sediments from a maar crater at Matukutureia, south Auckland. The record is discontinuous, reflecting formation of peat on the tuff surface after the eruption. The tuff section of the profile (3–7 million years old) has pollen of numerous extinct taxa and suggests broad-leaf beech ( Brassospora ) forest with Casuarina and Agathis , and warm temperate conditions. A date of 15 051 ± 80 ¹⁴C yr BP from the base of the overlying peat provides a minimum date for the eruption of McLauchlins Hill volcano. We cannot determine the timing of early Polynesian activities.  相似文献   

北京城区8月日花粉总数量和致敏花粉数量短期预报   总被引：2，自引：0，他引：2  

张姝丽张德山  何海娟穆启占 《气象科技》2006,34(6):724-727

对北京城区1983~1986年和1998~2003年8月逐日花粉总数量和致敏花粉数量的分析发现,北京夏秋季花粉日数量在“立秋”节气的前、中期呈缓慢增加趋势;在“立秋”节气的后期迅速增加;当进入“处暑”节气,日花粉总数量增长到峰值,并居峰值左右摆动。利用统计方法建立不同天气分型条件下以时间序列为因子的日花粉总数量和致敏花粉数量的短期预报模型,编制了日花粉总数量和日致敏花粉数量短期预报的软件操作平台,自动读取分型因子,制作出未来24 h北京花粉总数量和日致敏花粉的预报产品。  相似文献   

A high-resolution late Pleistocene record of pollen vegetation and climate change from Jingning, NW China   总被引：2，自引：0，他引：2  

LI Chunhai  TANG Lingyu  FENG Zhaodong  ZHANG Hucai  WANG Weiguo  AN Chenbang 《中国科学D辑(英文版)》2006,49(2):154-162

During the late Pleistocene, a number of climatic fluctuations such as the Heinrich events were recorded in the climatic proxies in the Loess Plateau and in North China[1―7]. Most of these records were based on geophysical and geochemical evidence[1―4]. Therefore, more biologic evidence is necessary for explaining the regional ecosystems in response to climatic change in the Loess Plateau during this period since pollen re-cords in other areas presented strong evidence to cli-matic fluctu…  相似文献