Late Glacial and Holocene vegetation history and paleoclimate of the Tengger Desert, northwestern China
Late Glacial and Holocene vegetation history and paleoclimate of the Tengger Desert, northwestern China
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DOI：
10.1360/02wd0274
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发表时间：
2003-07
影响因子：
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通讯作者：
Yuzheng Ma;Hucai Zhang;H. Pachur;B. Wünnemann;Jijun Li;Zhaodong Feng;Zhaodong Feng
中科院分区：
文献类型：
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作者：
Yuzheng Ma;Hucai Zhang;H. Pachur;B. Wünnemann;Jijun Li;Zhaodong Feng;Zhaodong Feng
在中国西北部腾格里沙漠南部(北纬38°10‘46“，东经102°45’53”)的两个剖面上采集了距今30000年的沉积物。孢粉组合表明，27580~23510年前，云杉森林在较湿冷的环境中占主导地位。在接下来的23510-21880年BP期间，在湿冷气候下出现了莎草科草甸。湿润和凉爽的条件又回来了，在公元前21880到20910年间，云杉森林重新占领了这一地区。从20910到15590年前，干旱环境下的草原统治着该地区。第一次升温大约开始于15590年前。15590~10890 a BP的孢粉组合可划分为6个小带，表明在不稳定气候条件下植被组成变化较快。公元前10710到10370年间，气候变得又冷又干。在公元前10260-9140年间，气候条件变得更加温暖和潮湿。从公元前8450到7950年，干旱气候下的草原景观占据了这一地区。7950年至7290年间，气候似乎更为湿润。公元前7290-5670年的下一段时间总体上是温暖的。5670年至3510年BP之间的时期以剧烈的气候振荡为特征。相对较冷的时期出现在7760和7380、6490-6290、5670-5010、4470-3510年左右。6290-5670年和5010-4470年发生了两次明显的干旱事件，3510年至3000年为明显的湿季。
Sediments spanning the last 30000 yr BP were obtained from two sections in the southern part of the Tengger Desert, northwestern China (38°10′46″N, 102°45′53″E). The pollen assemblage suggested a Picea forest domination under a wetter and cooler environment from 27580 to 23510 yr BP. During the following period from 23510 to 21880 yr BP a Cyperaceae meadow occurred under a wet and cold climate. Wetter and cooler conditions returned and a Picea forest re-occupied this region between 21880 and 20910 yr BP. From 20910 to 15590 yr BP a steppe under a dry environment dominated the region. The first temperature increase started at ca.15590 yr BP. The pollen assemblage covering the period between 15590 and 10890 yr BP can be divided into six minor zones, suggesting that the vegetation compositions changed rapidly under unstable climate. Between 10710 and 10370 yr BP the climate became cold and dry again. The climatic conditions became warmer and more humid between 10260 and 9140 yr BP. From 8450 to 7950 yr BP a steppe landscape under a dry climate occupied this region. Between 7950 and 7290 yr BP climate seemed more humid. The following period from 7290 to 5670 yr BP was generally warm. The period between 5670 and 3510 yr BP was characterized by dramatic climatic oscillations. Relatively cold intervals appeared around 7760 and 7380, 6490—6290, 5670—5010, 4470—3510 yr BP. Two pronounced dry events occurred in 6290—5670 and 5010—4470 yr BP with a marked wet spell from 3510 to 3000 yr BP.