A Preliminary investigation on the Vegetational and Climatic Changes Since 11, 000 Years in Qinghai Lake An Analysis Based on Palynology in Core QH85-14C

Qinghai Lake is the largest inland saline lake in China. it is situated in the northeastern part of the Qinghai Xizang Plateau. This paper is based on the information of the sporo-pollen assemblages of 47 samples from the drill core and surface samples. The general treads of vegetational and climatic changes since 11,000 years B. P. may be subdivided in ascending order as follows: In the first stage which corresponds to zone Ⅰ of the sporo-pollen assemlage, the vegetation during the past of 11,000–10,000 years was represented by a temperate shrub, semi-shrub and steppe, consisting of Chenopodiaceae. Artemisia, Nitraria, Ephedra and Gramineae were predominant. At the same time, some subalpine conifers, Pinus, Picea and Betula, would grow by the side of rivers and lakes, the climate was warmer and wetter than that of the Late Pleistocene. Due to the rising temperature in this zone, the Pleistocene-Holocene boundary might be estimated at about 11,000 years B. P.. The vegetation of the first stage belonges to temperate steppe with a few trees: In the second stage (ZoneⅡ of pollen), the vegetation was characterized by a temperate forest steppe during this period of 10,000 to 8,000 years B. P. Forest area apparently increased and some broadleaf deciduous and need leaf evergretn trees, such as Quercus, Betula, Pinus and Picea, grew by lakes and on mountains. At this time, the climate was warmer and wetter than that of the first stage. In the third stage (Zone Ⅲ) between B,000 and 3,500 years B. P, The vegetation was composed of a temperate mixed broad-leaf deciduous and needle-leaf evtrgreen forest. The needle-leaf evergreen forest consisting of Picea, Pinus, Abies, Betula grew in temperate zone mountains. The climate was relatively warm and wet. The fouth stage (zone IV), the vegetation was dominated by shrub semishrub, dwarf semishrubs, steppe and semi-arbors. Some trees consisting of Betula, Picea, and Pinus decreased in number in the lake regions. Some subalpine cold temperature evergreen trees, such as Abies and picea disappeared from the lake region. This indicated that the climate was warmer and drier during the past 3500–1500 years B. P. than the third zone. In the fifth stage (pollen zone V), the vegetation comprised steppe and desert from 1500 years ago to the present time. Some arborealtrus such as Betula and Pinus were less increased about 500 years B. P. at this time the temperate and wet slightly, rose up. From the above analysis, it is clear that the Qinghai lake region has been confronted with the vegetational and climatic changes since ll,000 years B. P. Therefore, the palynoflora of the Qinghai lake has its significance in Geography and vegetational history.     

Character of a Nology and Changes of Monsoon Climate Over the Last 10000 Years in Gucheng Lake,Jiangsu Province

Systematic palynological research was conducted on more than 343 samples from a column or rock core obtained by drilling to a depth of 20 m in Gucheng lake. According to three assemblage zones and nine subzones of the sporo-pollen, and the dating of 14℃, we have explored the regularity of palaeoclimatic changes and palaeomonsoon activities since 15.0 ka BP. During 15.0 ～ 11.0 ka BP, the temperature had increased a little, but the climate was still cool and relatively dry, reflecting a weak wet monsoon and low precipitation at that time. In the period of 3～11.0 ka BP, it became cold and wet, with an increased effect of the dry monsoon, and the area was probably situated in a position of the frontal zone. Causing considerable effective humidity. Later than 11.0 ka BP, the temperature increased rapidly within 500 years with a subsquent, turn of the climate towards significantly warmer and wet and a further intensification of the monsoon effect. This rapid temperature increase corre-sponded to the increasing radiation of solar energy during 11.0～10.0 ka BP. From 10.5 to 6.4 ka BP, the wet monsoon was the priority climate of the region, albeit there were at least two or three spells of cooling, as well as decreasing of monsoon precipitation.     

鄂尔多斯盆地西南部甘肃西峰地区延长组孢粉组合及古气候研究

鄂尔多斯盆地西南部西峰油田中上三叠统延长组长8段和长7段钻井岩心中发现丰富的孢粉化石,分别命名为Aratisporites-Punctatisporites组合和Asseretospora-Walchiites组合,组合特征分别与盆地东南部发现的铜川组孢粉组合和延长组孢粉组合相似,地质时代分别为中三叠世晚期Ladinian期与晚三叠世早期Carnian期。通过孢粉植物群类型地层分布特征及其生态环境讨论,推测盆地区中晚三叠世气候温暖潮湿,雨量充沛,植被茂盛。孢粉植物群所反映的古气候为温带—亚热带暖湿或湿热气候。这是由于本地区当时处于较低的纬度,且濒临大型湖泊,而长8—长7段沉积时期正处于湖泊扩张的鼎盛期。     

西藏台错古湖晚第四纪轮藻类及其生态环境、气候变化探讨

西藏台错TT-1剖面厚369 cm,为一套碳酸盐粘土和粘土碳酸盐沉积,地层测年为41.4-4.5 ka,含丰富的轮藻化石,分属于11个轮藻植物群,群落所在地层的碳酸盐和钙质含量分别为80％和33％.从老到新(剖面自下而上):①41.4-26.64 ka(369-319 cm),处于末次冰期间冰阶MIS3a暖期,湖区气候...     

Palynological Analysis of the Late Cenozoic and Its Significance in Fulaerji,Heilongjiang Province

The pollen analytical investigation of 226.07 m,, deep QH70 core from Fulaerji district in the city of Qiqihar, Heilongjiang province have been carried out. Based on the characteristics of QH70 core sporo-pollen assemblages, seven pollen zones may be subdivided in the order as follows: The first zone (Ⅰ) belongs to early period of the Late Cretaceous. When the flora was mainly composed of gymnosperm, the next was fern and a little original angisperm. Here the climate was hot and wet and the vegetation showed tropical-subtropical in aspects. In this core the author didn't find the Palaeogene flora. The Ⅱ–Ⅲ zones belonging to the Late Tertiary are characterized by predominance of arboreal pollens, mainly consisting of Amentiferae and some conifers. The flora of the Neogene was mainly composed of Pinus, Betula, Castanea, Ulmus, Corylus, Alnus, ,Juglans, Quercus, Carya, Fagus, Tsuga etc. some subtropical species of Hamamelis, Liquidambar, Castanopsis, Melia. Myrica and Taxodiaceae which still existed. The climate was warm and humid with the annual temperature higher than that of the present. As to the last period of the third zone (Ⅲ) the assemblage of herbaceous plants and semi-shrub were predominant. The climate was changed into cool and less dry. The fouth pollen zone (Ⅳ) is represented by herbaceous plants such as Artemisia, Chenopodiaceae, Gramineae, Polygonaceae etc. indicating the Fulaerji was covered by cold-temperature grassland with a cold and dry climate. According:to temperature decreasing at this zone, magnetostratigraphy and thermoluminescence dating we may take the start of the Ⅳ zone as the mark of the beginning of Quaternary in this region. The age of the boundary between Pliocene and Pleistocene might be 2.4 million years or so. The geological age of pollen zones Ⅳ–Ⅶ, is assigned to Pleistocene. The characteritics of the sporo-pollen assemblage at these zones are quite different from one another. In the fifth pollen zone (Ⅴ), the vegetation was represented by a steppe or tundra with a cold and dry climate at its initial stage, but in the late stage the flora was characterized by a deciduous broadleaved forest and steppe, indicating the climate was warm and less humid. Pollen zones Ⅵ–Ⅶ, the herbaceous plants, such as Artemisia, Gramineae, Chenopodiaceae etc. were predominant. The climate was rather dry and cold. The plants of the boreal conifers as Picea, ilbices, Larix, Pinus and the subpolor plants such as Betula were thriving in the low land and plain on the last glacial stage demonstrating that time the climate was humid and cold. Judging from the pollen analyses of core QH70, the vegetational development and climatic changes in Fulaerji had been rapid since the Late Tertiary. It is more or less significance to use pollen analysis in hydrogeology and engineering geology.     

Vegetational and Climatic Changes in the Past 30,000-10,000 Years in Beijing

This paper is based on the informations of the sporopollen assemblages of 52 samples obtained from the Fenzhuang field outcrop and its drilling core near Zhoukoudian in the vicinity of Beijing. About 30,000 years ago of the Dali glacial period, spruce-fir forests became predominant in the low land and the plain in Beijing. At that time the annual mean temperature was about 7 ℃ lower than that of the present. Based on the characteristics of Fenzbuang sporo-pollen assemblages four zones may be subdivided in ascending order as follows: 1. In the first zone (FⅠ), the herbaceous plants, such as Artemisia, Chenopodiaceae, Gramineae, etc., were predominant. The climate was rather dry and cold. 2. In the second zone (FⅡ), the vegetation during the past 22000–13000 years was dominate of a subalpine conifer forest, consisting of Picea, Abics, Larix, etc., Water plants Myriophyllum, Typha, Sparganium and some members of Cyperaeeae and Green algae, Mougeotia, Zygnema apparently increased. Annual mean temperature was lower than that of the present. The climate was wet with an annual precipitation about 800–1000 mm and cool. 3. In the third zone (FⅢ), the vegetation was represented by a warm temperate forest, predominant of Pinus, Tilia, Selaginella sinensis and Typha. The climate of Beijing was rather wet, with an annual mean precipitation more than that of the present, and warm. The Lakes and bogs were better developed. According to the temperature increasing at this zone, we think the Pleistocene-Holocene boundary should be maked at about 12000 B.P. 4. In the Zone Ⅳ (FⅣ), Tilia was still flourishing and the water plants were better developed at his initial stage but afterwards they were obviously reduced, since 10000 years ago.     

Palynoflora of the Qarhan Saline Lake and Its Significance in Geography and Botany The S poro-Poilen Assemblages from CK2022 Drilling Core at the Bieletan

The pollen analytical investigations of a 101 m deep CK2022 drilling core from Bieletan of the Qarhan saline lake have been carried out. The Qarhan saline lake is situated at the Qaidam Basin. The climate is cold and dry. Annual mean temperature is about 0.1 ℃, and annual precipitation is 28–40 mm. The vegetation is of desert type, mainly composed of Chenopodiaceae, Compositae, Tamaricaceac, Cruciferae, Zygophyllaceae, Leguminosae and Gramineae. Gymnospermae are very poorly represented e. g. Ephedra and Sabina. Ferns are even scanty. Based on the characteristics of CK2022 drilling core sporopollen assemblages 32,000 4,000 years ago five zones may be subdivided in ascending order as follows: 1. In the first zone, the vegetation during the past 31, 000–25, 600 years was represented by a temperate shrub and semi-shrub desert plants, such as Chenopodiaceae, Artemisia and Nitraria were predominant. The hydrophytes, such as Typha and Pediastrum boryanum, apparently increased. The climate was wet and rather warm. By this time, lakes and bogs were better developed in this area. 2. In the second zone (Ⅱ), green algae was very flourishing, which indicates a shallow, stagnant and more or less mesotrophic fresh water habitat. The climate was wet and cold, The lakes and bogs were better developed. 3 . In the third zone (Ⅲ), the vegetation consisted of Ephedra, Chenopodiaceae, Artemisia and Nitraria. At the same time subalpine conifer and Betula may have grown by rivers. The climate was warmer and drier than before. 4. In the fourth zone (Ⅳ), Shrubby and semi-shrubby deserts were better developed, but trees, ferns and algae were obviously reduced 18, 000–11, 000 years ago. The climate was very dry and cold. 5. In the fifth zone (Ⅴ), Ephedra, Chenopodiaceae, Artemisia and Nitratia were still flourishing. Hydrophytes, some trees and mesophytes plants and Polypodiaceae appeared again. Due to the increased temperature at this zone, the Pleistocene Holocene boundary should be demarcated at about 11000 years. BP Since 30000 years age there were alternation of dilution and salinization once and again.     

江苏溧阳神墩遗址地层的孢粉记录研究

对采自太湖西部的江苏溧阳市神墩遗址地层的17块土样进行了孢粉分析和研究,结果表明:在距今约7千年以前,研究地区尚无人类活动的痕迹,遗址点周围主要生长常绿和落叶阔叶混交林,如青冈、枫香、胡桃、栎、枫杨、悬铃木、榆和松等,反映比较温暖湿润的气候条件。马家浜文化早期气候温暖湿润,体现出良好的生存环境,但向晚期过渡时,气候环境发生变化,温凉偏干。马家浜文化晚期,遗址周围为亚热带常绿阔叶林,森林繁茂,气候温暖湿润,自然环境比较适宜人类活动与居住。良渚文化时期,木本植物花粉明显减少,草本花粉增加,约占孢粉总数的50%,气候环境为温凉。草本植物花粉中直径大于37μm的禾本科含量很大,达37.1%,可能是先人类进驻,开始进行农作,有水稻和小麦等农作物的大量种植。春秋时期,气候条件比良渚时期要好,较温湿,环纹藻等藻类孢子有较多出现,说明遗址区可能曾被淡水淹没成湖沼环境。     

新疆三塘湖盆地塘浅3井早侏罗世孢粉组合

本文对在新疆三塘湖盆地塘浅3井701－834m层段发现的孢粉植物群进行了系统的分析研究,共获孢粉45属93种（包括1新种）,疑源类化石5属5种及一个未定类型,组成以Osmundacidites-Piceites-Pinuspollenites-Quadraeculina为主的孢粉组合,根据孢粉组合特征,认为其时代应归为早株罗世晚期,对组合中主要孢粉属种可能的母体植物的生长环境进行分析,推测新疆三塘湖地区在早侏罗世晚期为温带－亚热带气候。     

Common garden comparison of the leaf‐out phenology of woody species from different native climates,combined with herbarium records,forecasts long‐term change

A well‐timed phenology is essential for plant growth and reproduction, but species‐specific phenological strategies are still poorly understood. Here, we use a common garden approach to compare biannual leaf‐out data for 495 woody species growing outdoors in Munich, 90% of them not native to that climate regime. For three species, data were augmented by herbarium dates for 140‐year‐long time series. We further meta‐analysed 107 temperate‐zone woody species in which leaf‐out cues have been studied, half of them also monitored here. Southern climate–adapted species flushed significantly later than natives, and photoperiod‐ and chilling‐ sensitive species all flushed late. The herbarium method revealed the extent of species‐specific climate tracking. Our results forecast that: (1) a northward expansion of southern species due to climate warming will increase the number of late flushers in the north, counteracting documented and expected flushing time advances; and (2) photoperiod‐ and chilling‐sensitive woody species cannot rapidly track climate warming.     

内蒙古自治区几个考古地点的孢粉分析在古植被和古气候上的意义

本文依据内蒙古自治区四个考古地点的孢粉分析资料,指出呼伦贝尔盟东部地区,在11400±230年前,不仅湖沼棋布,而且生长着由松、榆、椴、胡桃等组成的繁茂的温带针叶—阔叶混交林。公元前1700年,昭乌达盟敖汗旗一带,分布着暖温带针叶—阔叶混交林,从花粉分析说明那时的人类已摆脱了单纯狩猎,开始种植作物、饲养动物。自晚更新世以来,内蒙古植被由混交林向草原迅速的发展。     

云南禄丰古猿生活时期的古气候初步研究

本文通过对云南禄丰古猿化石地点的沉积物进行综合分析,提出古猿生活时期的气候变迁。即石灰坝组一段为干燥而凉爽气候;二段为温暖较湿润的气候;三段为湿热的南亚热带—热带气候;四段为古猿生活时期,已转变成干湿相间的南亚热带—热带季风气候。庙山坡组(五段),初期气候—度变得相当干燥而炎热、到后期又逐渐为干温气候。     

Spatiotemporal water dynamic modelling of Ramsar-listed lakes on the Victorian Volcanic Plains using Landsat,ICESat-2 and airborne LiDAR data

Spatiotemporal dynamic information on surface water area and level is a prerequisite for effective wetland conservation and management. However, such information is either unavailable or difficult to obtain. In this study, for the first time, we leverage Landsat imagery, ICESat-2 and airborne LiDAR data to develop time series of water body dynamics over the last 35 years (1987–2021) using machine learning method on a cloud computing platform for lakes identified as international importance in the Western District Lakes Ramsar site in Victoria, Australia. Our results reveal distinct seasonal (dry and wet) variation patterns and long-term changes in trends of lake water areas and levels in response to seasonal rainfall variations and regional climate changes for the periods of before, during and after the Millennium Drought when southeast Australia experienced unprecedented dry conditions. Lake water bodies have not recovered to the status of pre-Millennium Drought, and many permanent Ramsar-listed lakes in the region have become to ephemeral lakes due to climate change. The outcome of this study provides a baseline to help understand the historical and ongoing status of the Ramsar-listed lakes in a warming and drying climate in support of the development of strategic plan to implement international obligations for wetlands protection under the Ramsar Convention.     

西藏扎布耶盐湖晚第四纪孢粉植物群的初步研究

扎布耶盐湖位于西藏青藏高原腹地。通过该湖ＺＫ２钻孔的孢粉分析,揭示了约３６０００ａＢ．Ｐ．以来扎布耶地区的气候和湖盆演变。约在３６０００－３３０００ａＢ．Ｐ．,扎布耶地区为森林草原,气候冷、湿;约３３０００－３００００ａＢ．Ｐ．,为灌丛草原,气候温、干;约３００００－２７５００ａＢ,Ｐ．为干旱草原,气候偏暖、湿;约１８０００－１２０００ａＢ．Ｐ．,为干旱草原,环境寒冷,干燥;约１２０００－４０００ａＢ．Ｐ．,扎布耶地区各类草本植物繁茂,气候偏温、干。另外,根据水生藻类化石群的分析,自３６０００ａＢ．Ｐ以来,扎布耶盐湖有三次湖进、淡水湖期,同时也有三次湖退事件。     

On Analysis of Quant itative Geology for Quaternary Sporopollen in the Northern China Plain

The paper recommends the application of the hierarchical cluster, order cluster analysis and order correspondence analysis in dividing quaternary sporo-pollen zones, and the use of continuity coefficient (K) in defining classification number of the order cluster, the use of the ratio of factor load (D) in extending the result of the correspondence analysis to the classification of order samples. The application of above mentioned coefficients can help to assess better rationality in dividing sporopollen zones and provide evidence for the determination of the quaternary lower boundary, the evolution features of the paleovegetation and the paleoclimate. The sporo-pollen data of 36.2 samples in seven boreholes from the Northern China Plain (between 113–118˚E and 35–40˚N) were computed in this paper, and as a result, five sporopollen zones and six sporo-pollen subzones were defined. These zones and subzones, establishedon the basis of quantitative analysis, are closely related to the paleomagnetic polar and showno difference from the strata division by geological comprehensive interpretation, the ratio ofmisinterpretation is generally less than 5%. The age for each sporo-polten zones is as follows: sporo-pollen zone 1 ought to be Holocene Epoch, which is less than 1–1.2× 10⁴ years B. P. (Determined by the 14C method); ZoneⅡ ought to be Late Pleistocene, its boundary is located near Blake event in the paleomagneticpolar column; Zone Ill, Middle Pleistocene, B/M, about 73× 10⁴ years B. P.; Zone IV, EarlyPleistocene, M/G, about 248×10⁴ years B. P.; and Zone V, Pliocene, which is located under Gauss epoch in the paleomagnetic Polar column.     

Brackish to hypersaline facies in lacustrine carbonates: Purbeck Limestone Group,Upper Jurassic–Lower Cretaceous,Wessex Basin,Dorset, UK

Sedimentary facies and stratigraphic architecture of non-marine carbonates are controlled by a range of environmental parameters, such as climate, hydrology and tectonic setting, but the few published facies models do not account for this variability. Outcrop and petrographic observations from the Mupe Member of the Purbeck Limestone Group (Upper Jurassic–Lower Cretaceous) in Dorset, southern England, are the basis for new depositional models of non-marine microbialites and associated carbonates in an extensional basin. Ten facies are defined, described and grouped into five facies associations. The Mupe Member is characterised by accumulation of in situ microbial mounds developed around tree remains preserved as moulds and silicified wood. Mounds occur within three stratigraphic units, separated by three palaeosoils, characterised by less-porous, bedded, inter-mound packstone–grainstone that commonly onlap mound margins. Mounds are developed mainly in the shallowest areas of the lake, as indicated by their shapes, facies relationships and association with palaeosoils. These microbial mounds are compared to modern (Laguna Bacalar, Mexico and Great Salt Lake, Utah, USA) and ancient (Eocene Green River Formation, Uinta Basin, Utah, USA) analogues to assess their value as palaeoenvironmental indicators. Facies transitions indicate an earlier, brackish-water lake and a later hypersaline lake for the Mupe Member, both within a semi-arid climate setting in an extensional basin. The fact that the microbialites are covered by evaporitic strata, together with sedimentological, palaeontological and stable isotope data, suggest that there was a sharp change from through-flowing brackish-water, to a closed hypersaline, lacustrine system.     

Soybeans root distribution under wet soil culture on a red-brown earth

Root distribution of soybean was determined under wet soil culture on two Red-Brown earths in S.E. Australia. In general there was a parabolic distribution of roots with low root length densities in the furrow (saturated soil zone) and centre of the bed (dry zone). Maximum root length density (20 cm cm⁻³) occurred at the base of the plants, approximately 300 mm from the furrow under wet soil culture. Roots were confined to the wet aerated zone which was determined by the permeability of the soil.     

Vegetational Development and Climatic Changes in the Last 10000 Years in Beijing

In the previous paper authors found the vegetational and climatic changes in the past 30,000–10,000 years in Beijing. This paper is based on the informations of the sporo-pollen assemblages obtained from the Gaolizang, Dawangzhang, Yinjiahe, Xiwu- tiyng etc. with drilling cores in the vicinity of Beijing. About 12,000–10,000 years ago deciduous broad-leaved trees were flourishing in Beijing. At that time the climate was warm and rather wet. 10,000–8,000 years ago, the herbaceous plants, such as Artemisia, Compositae were flourishing in plain of Beijing and mountainous region was dominant in subalpine conifer forest, consisting of Pinus, Picea and Abies, According to the needle-leaved forest increasing at that time we think about 9,000 B. P. that climate was cool and wetter. In the past 8,000–6,000 years, needle-leaved and deciduous broad-leaved mixed forest, consisting of Pinus, Quercus and Betula thrived under a warm and wetter climate, the bogs were better developed in plain. During 6,000–2,000 years, in general review on the sporopollen assemblages of the Beijing we think that the climate was warm, especial about 5,000 years ago, the flora was mainly composed of deciduous broad-leaved trees, such as Ulmus, Quercus, Morus and Betula. But during 5,600 years ago or so, spruce-fir forest became predominant in the low land and the plain of Beijing again. At that time the annual mean temperature was lower than that of the present. It was corresponed to new glacial period. The flora mainly composed of Pinus was obviously reduced since 2,000 years. The glassland even increased in Beijing.     

Paleovegetation and Paleoclimate in the Past 20,000 Years in Jiaozhou Bay,Qingdao District

The spore-pollen assemblages collected from drilling cores in Jiaozhou Bay, Qingdao district, are analyzed in this paper. We have ascertained paleovegetation and paleodimate since last 20000 years in the studied district. It is concluded that development process can be devided into six stages, each stage has its corresponding characteristics on paleovegetation and paleoclimate. These stages are listed as follows: ( 1 ) Vegetation was mainly herbaceous plants and climate was cold and dry during 20000–13000 years B P (2) During 13000– 11000 years B P, there was a little conifer forest and herbaceous plants, in which aquatic and weter plants were relatively richer in quantities, climate was mild and wet. (3) During 11000–8500 years B P there was a little conifer and broadleaved forest and herbaceous plants, climate was mild and slightly dry. (4)During 8500–5000 years B P broadleaved trees were predominant but mixed with conifer forest, climate was warm and wet. (5) During 5000–2500 years B P conifer trees were predominant but mixed with broadleaved trees and herbaceous plants, climate was mild and slightly dry. (6) From 2300 years B P to present, we can further divide this stage into two periods, the preceding period and the late period. In the preceding period, vegetation was composed by conifer and broadleaved trees and herbaceous plants, climate was warm and wet; while conifer trees (including a little broadleaved trees) were prevailed in the late period, climate was mild and wet. As a result, we have concluded that the general tendency of climate variation for the studied district is consistent with North China and East China one, but there still exists a little differences. The authors suggest that the time limit between Pleistocene and Holocene should be demarcated at 11000 years B P owing to sharply increasing temperature for the studied district.     

孢粉信息函数在辽河断陷西部凹陷沙河街组古环境分析中的应用

为了加强含油气盆地的古环境和古气候研究,寻找古环境研究的多种途径,探索用孢粉信息函数半定量恢复古环境和古气候。孢粉是气候变化敏感的信息载体,气候适宜,孢粉信息函数值越高,而且在沉积过程中,从岸边到湖盆中心,随着水体加深,孢粉信息函数值逐渐降低。利用孢粉信息函数的这种变化规律,按<2.0、2.0—2.1、>2.1三个参数值,将辽河断陷西部凹陷沙河街组一段沉积时期的湖盆划分为半深湖、浅湖和滨浅湖环境。并依据沙河街组孢粉信息函数值从沙四段到沙一段呈现低(1.97)—高(2.12)—低(1.88)—高(2.28)的韵律性变化,判断古气候呈干热—潮湿—干热—潮湿的旋回性演变。西部凹陷沙河街组孢粉信息函数的变化规律与古气候演变有很好的响应,同时与盆地不同发育阶段的古地貌、古环境密切相关。因此,孢粉信息函数是重建古气候、古环境的有效手段之一,能弥补缺少大化石给含油气盆地沉积环境研究带来的不足。