摘要
中国西部新疆巴里坤荒漠草原是地球陆地生态系统最脆弱的区域之一,其物种组成简单、植被盖度较低,研究其相关花粉源范围(RSAP)和相对花粉产量(RPP)对利用化石花粉数据定量重建荒漠草原区古植被、古环境具有重要意义。本文基于中国西部干旱区巴里坤盆地荒漠草原36个样点的现代花粉分析和详细植被调查,采用Prentice距离加权方法和ERV子模型2,估算出研究区RSAP为255 m;以禾本科为参照种(1±0)估算了其余5种植物类型(柽柳科1.50±0.13、蒿属16.15±1.41、藜科28.39±1.62、麻黄22.87±0.76、菊科20.50±2.68)的RPP。景观重建算法(LRA)花粉产量检验表明,禾本科、蒿属、藜科、麻黄和菊科模拟的相对植被盖度与实际相对盖度误差较小,花粉产量值可信;但柽柳科花粉重建的相对植被盖度低于实际相对盖度,花粉产量值被高估。考虑到研究区真实植被盖度较低(实际植被盖度低于30%,无植被裸地约70%),作者基于遥感影像数据,依据现代类比法(MAT)对景观重建算法重建的相对植被盖度进行了校正,校正后的各属种植被盖度与实际盖度吻合。
The Barkol Desert Steppe is one of the most vulnerable area on the earth's land ecological system.It has simple species composition and low vegetation coverage.Study on its relative source area of pollen(RSAP)and relevant pollen productivity(RPP)have great potential to reconstruct ancient vegetation and ancient environment in desert steppe areas.This study is based on detailed vegetation survey and modern pollen analysis of 36 sampling sites in the desert steppe area of the Barkol Basin(43°39'~44°10'N,91°54'~92°04'E),which is located in the hinterland of arid northwest China,surrounded by mountains on all sides,using the ERV model to estimate the RSAP of the study area and the RPP of the 6 main plant types.Four plant communities are defined based on the plant species composition within 100 m of each sampling site:grass communities,Artemisia communities,Chenopodiaceae-Ephedra communities and Reaumuria songarica communities.The pollen assemblages are dominated by Chenopodiaceae,Artemisia,Ephedraceae and Asteraceae.It is estimated that RSAP of the study area is 255 m by using Prentice distance weighting method and ERV sub-model two.Compared with other steppe areas,the RSAP is smaller,which may be related to the vegetation cover,vegetation patch size,the accuracy of the vegetation map and sedimentation radius size in the study area.Using Poaceae as the reference species(1±0)to estimate the RPP of the remaining five plant types(Tamariaceae 1.50±0.13,Artemisia 16.15±1.41,Chenopodiaceae 28.39±1.62,Ephedraceae 22.87±0.76,Asteraceae 20.50±2.68).Regional climate and the composition of species may affect RPP.The modern vegetation reconstruction using Landscape Reconstruction Algorithm(LRA)shows that the errors between simulated and observed relative vegetation coverages of Poaceae,Artemisia,Chenopodiaceae,Ephedraceae and Asteraceae are small,showing the results of relative pollen productivities are credible;however,the reconstruction of relative vegetation coverage for Tamaricaceae plant is lower than the actual coverage,showing the relative pollen productivity result is overestimated.Considering the real vegetation coverage in study area is less than 30%,and the bare land(without vegetation cover)is about 70%,the author adjusts the relative vegetation coverage reconstructed by Landscape Reconstruction Algorithm approach(LRA)to true vegetation coverage according to remote sensing image data and Modern Analogue Technique(MAT).The results show that the adjusted vegetation coverage of each plant taxa is consistent with the actual coverage.
作者
王叶星
许清海
张生瑞
孙沅浩
李怡雯
郝佳
黄荣
石晋东
王娜
王涛
李月丛
张茹春
阳小兰
周忠泽
WANG Yexing;XU Qinghai;ZHANG Shengrui;SUN Yuanhao;LI Yiwen;HAO Jia;HUANG Rong;SHI Jindong;WANG Na;WANG Tao;LI Yuecong;ZHANG Ruchun;YANG Xiaolan;ZHOU Zhongze(College of Resources and Environment Sciences,Hebei Normal University,Shijiazhuang 050024,Hebei;Hebei Key Laboratory of Environmental Change and Ecological Construction,Shijiazhuang 050024,Hebei;College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,Gansu;Institute of Geographical Science,Hebei Academy of Sciences,Shijiazhuang 050011,Hebei;School of Resources and Environmental Engineering,Anhui University,Hefei 230601,Anhui)
出处
《第四纪研究》
CAS
CSCD
北大核心
2021年第6期1738-1748,共11页
Quaternary Sciences
基金
国家自然科学基金项目(批准号:41630753、41501048和41702184)
中国国家基金委和瑞典皇家教育基金会国际合作项目(批准号:41611130050)
河北省环境演变与生态建设重点实验室和河北省重点学科基金项目共同资助。
关键词
西部干旱区
荒漠草原
相对花粉产量
相关花粉源
ERV
LRA
western arid area
desert steppe
relative pollen productivity
relevant source area of pollen
ERV
LRA
