中国西北沙漠毗邻区表土花粉与植被和气候的关系——古气候定量重建的尝试  

Relationship Between Topsoil Pollen,Vegetation,and Climate in Desert Adjacent Areas of Northwest China:Implications of palaeoclimate and palaeocological reconstruction

作　　者：许可可 杨振京[1] 宁凯 毕志伟[1] 杨庆华[1] 赵楠楠 XU KeKe;YANG ZhenJing;NING Kai;BI ZhiWei;YANG QingHua;ZHAO NanNan(Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Zhengding,Hebei 050800,China;China University of Geosciences(Beijing),Beijing 100083,China;Center of land and Resources Exploration,Hebei Bureau of Geology and Mineral Resources Exploration,Shijiazhuang 050000,China)

机构地区：[1]中国地质科学院水文地质环境地质研究所,河北正定050800 [2]中国地质大学(北京),北京100083 [3]河北省地矿局国土资源勘查中心,石家庄050000

出　　处：《沉积学报》2023年第4期1067-1079,共13页Acta Sedimentologica Sinica

基　　金：中国地质科学院水文地质环境地质研究所基本科研业务费(SK202012);河北省自然科学基金项目(D2021504016);中国地质调查局地质调查项目(DD20221773)。

摘　　要：为探讨中国西北沙漠毗邻区现代花粉、植被和气候之间的定性和定量关系,利用222个表土花粉样品、植被样方调查以及气象数据,进行指示种分析、花粉代表性分析、排序分析以及古气候定量重建尝试。结果表明,沙漠毗邻区的表土花粉可分为荒漠带(三个亚带)、灌丛带、草甸带、高山草甸带和林草过渡带5个带;各植被带中主要科属花粉的代表性均较低,且同种花粉不同区域代表性有较大差异;荒漠带2和灌丛带的花粉组合与植被调查一致性较差,其余植被带的花粉组合和植被调查结果均有较好的一致性;指示种分析以及排序分析表明除草甸带和高山草甸带样点区分度较差外,其余植被带样点之间均有较好的区分;年平均降水量、7月平均温度和1月平均温度是研究区3个重要的气候变量,其中年平均降水量是气候重建最理想的因素;利用加权偏最小二乘法(WA-PLS)和现代类比法(MAT)建立花粉—气候校准集,留一法交叉验证结果显示,WA-PLS预测性能优于MAT。To explore the qualitative and quantitative relationship among modern pollen,vegetation,and climate in the adjacent desert of northwest China,222 topsoil pollen samples,vegetation sample survey results,and meteorological data were used to perform indicator species,pollen representative,and sequence analyses and paleoclimate quantitative reconstruction.The results show that the topsoil pollen in the adjacent desert area can be divided into three desert subzones,as well as shrub,meadow,alpine meadow,and forest-grass transition zones.The representativeness of pollen from major families and genera in each vegetation zone is low,and that of the same species differs significantly in different regions.The pollen assemblage of desert zone 2 and the shrub zone is not consistent with the vegetation investigation.The pollen assemblage and vegetation survey results of other vegetation belts are in good agreement.Indicator species and sequencing analyses show that except for the poor differentiation of the meadow and alpine meadow zones,there is a good distinction among the different zones,and the three important climate variables in the study area are annual mean precipitation(Pann),July mean temperature(TJuly),and January mean temperature(TJan),among which Pann is the most ideal factor for climate reconstruction.The pollen-climate calibration set is established by using the weighted partial least square(WA-PLS)and modern analogy(MAT)methods.The crossvalidation results show that the prediction performance of WA-PLS is better than that of MAT.

关 键 词：沙漠毗邻区 表土花粉 花粉—植被关系 花粉—气候校准集 

分 类 号：P532[天文地球—古生物学与地层学]