| 中国东北沙地埋藏土壤的成因和环境指示意义 |
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| 引用本文： | 任国玉.中国东北沙地埋藏土壤的成因和环境指示意义[J].干旱区地理,1997,20(2):73-79. |
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| 作者姓名： | 任国玉 |
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| 作者单位： | 国家气候中心!北京100081 |
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| 摘 要： | 本文对我国东北沙地沙丘埋藏土壤的形成原因重新进行了探讨。新的观察和证据表明,中晚全新世沙丘埋藏土壤的形成主要是过去人类活动等非气候因子导致附近沙丘活化或沙漠化所引起的,气候变化所起的作用可能比原来认为的小得多;中晚全新世的埋藏土壤及其风沙层序列因而不能被用来指示过去气候变化,但可以被用来重建过去人类活动与沙地环境相互作用历史。
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| 关 键 词： | 沙丘埋藏土壤 古气候 沙地 土壤成因 土壤环境 |
FORMATION AND ENVIRONMENTAL SIGNIFICANCE OF THE BURIED SOIL UNDER SAND DUNES ON THE MAJOR SAND LANDS IN NORTHEAST CHINA |
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| Ren GuoYu.FORMATION AND ENVIRONMENTAL SIGNIFICANCE OF THE BURIED SOIL UNDER SAND DUNES ON THE MAJOR SAND LANDS IN NORTHEAST CHINA[J].Arid Land Geography,1997,20(2):73-79. |
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| Authors: | Ren GuoYu |
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| Abstract: | It has been long held that the buried soil under sand dunes on the major sand lands in northern China formed due to the climatic changes of the Holocene, which could be used as a proxy record to reconstruct the past climate in warm-humid periods. In this paper, an alternative is put forward to explain the new observation obtained from the sand lands of Northeast China, and the past human activities are suggested as the dominating factor for the formation of the buried soil layers in the sand dunes. This explaination is supported by the facts that the formation ages of the buried soil layers in the same sand land are not simultaneous, the mature degree and thickness for the buries soil layers in the same sand dune decrease from bottom up to top, and the burrying process of the modern soil on sand dunes and on inter-dune lowlands is being under way owing to the human induced desertincation in present. These facts are very difficult to be explained by change in wettness or in precipitation. It is more possible that the settlement of population in the sand lands in the past led to the mobilization of the sand dunes, and the human-induced descrtification caused the soil to be buried by the drifting sand, forming the buried soil layers under sand layers. In spite of this, a stable climate with wetter condition may be helpful for the recovery of the vegetation and soil after the sand layers above the buried soil is deposited, and may thus be Anportant for the formation of the alternative soil and sand layers in the late Holocene period. In most cases, therefore, the "dead soil" could not be callcd paleosoil, and it could hardly be used to indicate the past climate changes either. |
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| Keywords: | buried soil under sand dunes paleoclimate human activity northeast China |
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