HOLOCENE ENVIRONMENTAL CHANGES IN THE GUANZHONG PLAIN
HOLOCENE ENVIRONMENTAL CHANGES IN THE GUANZHONG PLAIN
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发表时间：
2003
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通讯作者：
Zhao Jing-bo
中科院分区：
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作者：
Zhao Jing-bo
根据陕西岐山剖面高分辨率孢粉分析和古土壤类型研究，探讨了关中平原全新世环境变迁。中全新世发育的土壤中粘粒灌浆较强，粘质粘土膜发育较好，CaCO 3含量小于1%，CaCO 3淀积层已从古土壤粘粒灌浆层迁移过来。这些资料表明，这是一种强度不低于淋溶褐土的残积森林土，而不是过去所谓的森林草原环境下发育的黑黄土。通过对旗山剖面54个样品的孢粉分析，结果表明：旗山剖面孢粉含量丰富，每个样品的孢粉颗粒数在100粒以上，约有50个科属。花粉组成以草本花粉为主。乔木花粉含量在10%以下的有栎属、松属、臭椿属、鹅耳枥属、榆属、桤木属、榛属、栗属、朱兰香属、化香属、枫香属、云杉属、漆树属等，草本花粉含量在10%以下的有菊科、蒿属、藜科、禾本科、十字花科、茜草科等，根据乔木花粉含量和组成变化，全新世植被与气候变化可分为三个时期九个阶段。早全新世可分为两个阶段。第一阶段为落叶阔叶林，第二阶段为森林草原。中全新世可分为五个阶段。第1、3、5级为落叶阔叶林，其余为森林草原。第一阶段潮褐土发育良好，气候适宜;年平均气温比现在高3℃，年平均降水量比现在多200毫米左右。晚全新世可分为两个阶段。第一种是森林草原，第二种是落叶阔叶林。
According to the high resolution sporo-pollen analysis in the Qishan profile of Shaanxi Province and the study on the paleosol type, the paper has discussed the Holocene environmental changes in the Guanzhong Plain. The clay grouting in soil developing in Middle Holocene in the area was stronger, lumpy clay films developed well, the content of CaCO 3 is less than 1%, and the illuvial horizon of CaCO 3 has migrated from the clay grouting horizon of the paleosol. This materials indicated that it was eluvial forest soil whose intensity was no less than Luvic cinnamon soil and it was not Dark loessial soil that developed under the forest-steppe environment so-called in the past. The sporo-pollen analysis of 54 samples in Qishan profile indicates the content of sporo-pollen is rich and there is more than 100 grains in each sample, including about 50 families and genuses. The majority of the sporo-pollen constitute is herbaceous pollen. The content of arbor pollen is less than 10%, including Quercus, Pinus, Ailanthus, Carpinus, Ulmus, Alnus, Corylus, Castanea, Julance, Platycarya, Pterocarya, Picea, Rhus and so on. The pollen of herbaceous are Compositae, Artemisia, Chenopodiaceae, Gramineae, Cruciferae, Rubiaceae and so on. According to the content and constitute changes of arbor pollen, Holocene vegetation and climate changes can be divide into three periods and nine stages. The Early Holocene can be divided into two stages. The First stage is deciduous broadleaf forest and the second stage is forest-steppe. The Middle Holocene can be divided into five stages. The first, the third and the fifth are deciduous broadleat forest and the rest are forest-steppe. Luvic cinnamon soil developed well and the climate was suitable in the first stage. The mean annual temperature was 3℃ higher and the mean annual rainfall is about 200mm more than present. The Late Holocene can be divide into two stages. The first is forest-steppe and the second is deciduous broadleaf forest.