PALEOSOLS OF SANDY LANDS AND ENVIRONMENTAL CHANGES IN THE WESTERN PART OF NORTHEAST PLAIN OF CHINA WESTERN DURING HOLOCENE
- Publish Date: 1995-06-20
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Key words:
- Northeast Plain /
- sandy land /
- paleosol /
- Holocene Environment
Abstract: Two-three paleosol layers were formed in the western part of the Northeast Plain. China during Holocene. These paleosol layers interlaid with eolian fine sand layers. Dated by 14C dating. archeology and TL and analyzed by statistics.the formation periods of paleosols are divided from the results. The periods are 11000-7000 5500-4500. 3500-2800 and 1400-1000 a B. P. respectively.According to the spore-pollen compositions in more than ten sand dune paleosol profiles, it is discovered th.t there is little spore-pollen in the sand layers and a little spore-pollen in the paleosol layers. The spore-pollen compositions in the paleosols are simple. mainly Artemisia (50%-70%) and Chenopodiaceae. In the paleosols of 11000-7000 a B. P.. the spore-pollen composition is Artemisia-Rubiaceaechenopodiaceae. The contents of Ephedra pollen in the lower and upper parts of the layer are less than that in the middle part. In the paleosols of 5500-4500 a B. P.,the spore-pollen composition is Artem isal-Chenopod iaceae-Melilotus. There is some Salix sp. and Betula sp. pollen in the lower part of the layer and some Ephedra pollen in the upper part. In the paleosols of 3500-2800 a B. P.. the spore-pollen composition is Artemisia Chenopodiaceae-Rubiaceae. There are some Kochia and Baryaceae. In the paleosols of 1400-1000 a B. P., the spore-pollen composition is also Artemisia-Chjenopodiaceae-Rubiaceae. There is a little pine pollen. The grain size of paleosol is relatively coarse, but still finer than that of eolian sand and becomes coarser from the bottom to the top of the profile. This fact reflects that the weathering environments during the paleosol formation periods were wetter than that during the eolian periods and became dryer from middle to late Holocene.
Citation: | Qiu Shanwen, Li Qusheng Xia Yumei, Wang Jinglu, . PALEOSOLS OF SANDY LANDS AND ENVIRONMENTAL CHANGES IN THE WESTERN PART OF NORTHEAST PLAIN OF CHINA WESTERN DURING HOLOCENE[J]. Chinese Geographical Science, 1995, 5(2): 137-148. |