干旱区生态环境知识资源中心(Arid): 柴达木盆地6.0kaB.P.,2.5kaB.P.和现代的植被覆盖度重建

Arid

	柴达木盆地6.0kaB.P.,2.5kaB.P.和现代的植被覆盖度重建
其他题名	QUANTITATIVE RECONSTRUCTIONS OF VEGETATION COVERS FOR THE PERIODS OF 6.0kaB.P.,2.5kaB.P.AND 0kaB.P.IN QAIDAM BASIN
	郑艳伟 1; 郑卓 1; 黄康有 1; 潘安定 2; 马海州 3; 魏金辉 1; 魏海成 3
ISSN	1001-7410
出版年	2009
卷号	29 期号:4 页码:701-710
中文摘要	研究区位于青海柴达木盆地及其邻近地区,本文利用MODIS的植被覆盖度栅格数据,对区内的286个表土花粉样品进行覆盖度估算的误差与精度检验,并且选取了尕海湖和青海湖6.0kaB.P.,2.5kaB.P.和现代的3个时间片段进行裸地、草地和乔木覆盖度变化的研究.冰消期以来的气候变化必然导致荒漠一草原一森林草原的边界发生位移,钻孔第四纪花粉数据的植被覆盖度莺建是一个新的尝试,它可以为该地区植被带的位移和季风变化提供重要的环境替代指标.本文采用经验正交函数(EOF)对多变量花粉数据进行了组合变换,然后采用弦距离类比法获得覆盖度的定量重建值.两个钻孔的花粉一覆盖度转换结果清楚地揭示出柴达木盆地6.0kaB.P.时期较为湿润,而2.5kaB.P.和现代较为于旱,其中青海湖在6.0kaB.P.的乔木覆盖度达到6.13%,而到了2.5kaB.P.和现代降至0.5%左右.尕海的草地覆盖度在6.0kaB.P.达到46.87%,而到了2.5kaB.P.降至21.75%和现今的0%.本研究结果证明,采用表土花粉数据作为标准数据集来进行古代植被覆盖度转换是可行的,该方法相对于A/C比值对指示干旱程度方面更具有说服力,在季风边缘区和农牧交错带的环境变迁定量化研究方面具有较大的潜力.
英文摘要	The studied area includes the Qaidam Basin,Qinghai Province and its neighboring regions.The research is focused on the accuracy test of pollen-based vegetation cover estimation including bare,herb and tree,for 286 surface pollen samples.The vegetation cover reconstruction is applied to the periods of 6.0kaB.P.,2.5kaB.P.and 0kaB.P.from cores in Gahai and Qinghai hkes.The Qaidam area is characterized by transitions among desert,grassland and forest,which might have shifted since the Last Glacial Maximun resulted from climate fluctuation and monsoon changes.The present land-cover reconstruction is a new attempt and can be used as an environmental proxy for evaluating the climate changes and monsoon circulation.We use here the empirical orthogonal functions (EOF)to replace the muhivariable pollen data,and then reconstruct quantitatively the past vegetation cover by means of the best analogue with the chord distance.The reconstruction shows that the climate was wetter at 6.OkaB.P.In the Qinghai lake the tree cover was as high as 6.13% at 6.0kaB.P.,and fell down to ca.0.5% at 2.5kaB.P.and 0kaB.P.The Gahai lake result shows that the grass cover attained 46.87% at 6.0kaB.P.,and decreased to 21.75% at 2.5kaB.P.and 0% at present-day.The present work testified that the pollen-based vegetation cover reconstruction is feasible as a land cover proxy.The vegetation cover reconstruction provides more abundant information and more reliable estimation on the dryness index in comparison with A/C ratio.The method has a high potential application on quantitative studies of climate changes in the summer monsoon zone and the farming-pastoral boundaries.
中文关键词	植被覆盖度 ; 花粉分析 ; 柴达木盆地 ; 全新世 ; 卫星数据
英文关键词	vegetation cover pollen Qaidam Basin Holocene Satellite data
语种	中文
国家	中国
收录类别	CSCD
WOS类目	HORTICULTURE
WOS研究方向	Agriculture
CSCD记录号	CSCD:3592070
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/223455
作者单位	1.中山大学地球科学系, 广州, 广东 510275, 中国; 2.广州大学地理科学学院, 广州, 广东 510006, 中国; 3.中国科学院青海盐湖研究所, 西宁, 青海 810008, 中国
推荐引用方式 GB/T 7714	郑艳伟,郑卓,黄康有,等. 柴达木盆地6.0kaB.P.,2.5kaB.P.和现代的植被覆盖度重建[J]. 中国科学院西北生态环境资源研究院,2009,29(4):701-710.
APA	郑艳伟.,郑卓.,黄康有.,潘安定.,马海州.,...&魏海成.(2009).柴达木盆地6.0kaB.P.,2.5kaB.P.和现代的植被覆盖度重建.,29(4),701-710.
MLA	郑艳伟,et al."柴达木盆地6.0kaB.P.,2.5kaB.P.和现代的植被覆盖度重建".29.4(2009):701-710.