地理学报 ›› 2006, Vol. 61 ›› Issue (9): 937-945.doi: 10.11821/xb200609005

• 干旱区环境研究 • 上一篇    下一篇

鄂尔多斯高原古城夯层沙的环境解释

王乃昂1,2, 黄银洲2, 何彤慧2,3, 冯文勇2,4, 隆浩2, 程弘毅2   

  1. 1. 兰州大学西部环境教育部重点实验室,兰州 730000;
    2. 兰州大学资源环境学院,兰州 730000;
    3. 宁夏大学资源环境学院,银川 750021;
    4. 忻州师范学院地理系,山西忻州 034000
  • 收稿日期:2006-07-02 修回日期:2006-08-03 出版日期:2006-09-25 发布日期:2010-09-01
  • 作者简介:王乃昂 (1962- ), 男, 博士, 教授, 博士生导师, 主要研究方向为气候变化、环境考古和历史地理。 E-mail: wangna@lzu.edu.cn
  • 基金资助:

    国家自然科学基金项目 (40471138); 国家自然科学基金创新群体项目 (40421001)

The Environmental Significance of Tamping Sandy Layer in Ancient City Ramparts on Erdos Plateau

WANG Nai'ang1,2, HUANG Yinzhou2, HE Tonghui2,3, FENG Wenyong2,4, LONG Hao2, CHENG Hongyi2   

  1. 1. Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University,Lanzhou 730000, China;
    2. College of Earth & Environmental Sciences, Lanzhou University, Lanzhou 730000, China;
    3. College of Resource & Environment, Ningxia University, Yinchuan 750021, China;
    4. Department of Geography, Xinzhou Teachers University, Xinzhou 034000, Shanxi, China
  • Received:2006-07-02 Revised:2006-08-03 Online:2006-09-25 Published:2010-09-01
  • Supported by:

    National Natural Science Foundation of China, No.40471138; NSFC Innovation Team Project, No.40421001

摘要:

在2005年野外实地考察过程中,于内蒙古自治区准格尔旗十二连城、神木县大保当古城、鄂托克前旗巴彦呼日呼等古城址城墙中发现“夯层沙”。实验分析表明其成因皆为风成,堆积时代应在建城之前,反映当时地表流动沙丘或半固定、固定沙丘的广泛分布,由此证明鄂尔多斯地区的沙漠在人类大规模开发之前即已存在。这一重要发现为研究本区土地退化、沙漠化等问题提供了新的依据,对西部大开发战略重点之一的生态环境保护与建设具有特殊的历史借鉴意义。

关键词: 古城, 夯层沙, 历史沙漠化, 鄂尔多斯高原, 内蒙古, 陕西

Abstract:

In 2005, when studying the process of historic sandy desertification on Erdos Plateau, we found that a lot of ancient city ramparts were fortified by alternate layers of sand and soil, and these cities included Shi'er Lian Ancient City (located in Zungar Banner, Inner Mongolia, China), Dabaodang Ancient City (located in Shenmu county, Shaanxi province, China), Bayanhurihu Ancient City (located in Otog Front Banner, Inner Mongolia, China) and so on. They are located in deep desert now. Several researchers have thought that the fate of these ancient cities is associated with natural environmental conditions. However, our experimental result does not support this view. The discovery sheds new light into when and how sandy desertification occurred and provides new historic insight for eco-environment conservation in this district. Through the experiment, some conclusions are drawn as follows: (1) The sandy layer in the ramparts consisting of aeolian-sand which should deposit before the cities were built. Considering the time when these cities were built, we could conclude that the desert scene had existed before the Han Dynasty. Some researchers pointed out that the existence of these cities were associated with good natural conditions when they were built, while our experimental result did not support this view. Accordingly, the existence of these cities could not be an evidence to prove good environmental conditions on Erdos Plateau in historical times. (2) It is an effective way to analyze the environmental change and process of man-land relationship through the fate of the ancient cities, relics, traces of human activities and changes in wasteland reclamation. However, it is not accurate to quantify the time when sandy desertification occurred through the time when these relics were abandoned. Undoubtedly, farming activities in historical times to a certain extent destroyed vegetation on Erdos Plateau, thereby accelerating the process of sandy desertification, but it is not the main factor leading to sandy desertification before the Ming Dynasty. (3) It is credible that sandy layer in the ramparts as a direct sign to interpret the environmental background, so it is very useful for us to explain the process of sandy desertification in historical times. Through the discovery, mobile sand dunes, fixed sand dunes, meadows in low humid lands, lakes, and so on, can coexist on Erdos Plateau in prehistory and human history. Up to now, these environments still coexist in the district.

Key words: ancient city, tamping sandy layer, historic sandy desertification, Erdos Plateau, Inner Mongolia, Shaanxi Province