鄂托克旗風蝕荒漠化景觀格局動態變化研究

摘要： 利用鄂托克旗2000年和2005年TM遙感影像,對荒漠化土地進行判讀,結合實地調查,并根據中國"三北"地區荒漠化區域分類與發展趨勢綜合研究野外地質調查內容-技術要求,確定土地荒漠化景觀類型和荒漠化程度,將研究區風蝕荒漠化分為輕度沙化、中度沙化、重度風蝕和嚴重風蝕4個類型.應用Arcview3.3對兩期TM影像進行人機交互判讀,得到研究區兩個時期的風蝕荒漠化景觀類型數據并統計,分析研究區風蝕荒漠化景觀格局的動態變化.結果表明,未荒漠化土地主要集中在研究區的北部,嚴重風蝕主要集中在研究區的南部,由北向南,風蝕程度逐漸加重.研究區風蝕荒漠化主要以輕度沙化和中度沙化為主,占研究區風蝕面積的70%以上,破碎度有所增大.風蝕荒漠化面積雖有減小,但風蝕呈加劇趨勢.鹽漬化土地已轉化為風蝕荒漠化景觀,而風蝕荒漠化景觀可以向其他各景觀轉化.在適當條件下,輕度沙化土地與未荒漠化土地容易相互轉化.中度沙化土地和重度風蝕土地容易轉變為其他景觀. Abstract： The TM remote sensing images of Otog Banner in 2000 and 2005 were interpreted to abstract the desertification lands. The results combined with the field survey were used to determine the types and degrees of desertification lands according to the requirements of content-technology in the desertification regionalization of China "three-north" regions. The aeolian lands in study region can be classified as four types: slight desertification, moderate desertification, severe desertification, and very severe desertification. The statistical data on landscape patterns of the study region in two periods were obtained through human-computer interaction interpretation with Arcview3.3 software. Then the dynamic changes of aeolian landscape patterns were analyzed. The results showed that not desertification lands mainly distributed in the north and very severe desertification lands in the south of Otog Banner, with the wind erosion degree increasing from north to south. The area of desertification lands in the study region had decreased, but the wind erosion degree of land increased, and the desertification area of both slight desertification and moderate desertification occupied more than 70% of the erosion area. The former salinized lands had been transformed into aeolian desertification lands. Generally, under proper conditions transformation usually occurred between the slight desertification and non desertification lands, and the middle and the severe types are inclined to the other landscapees. 作 者： 朱麗    李金霞    秦富倉    姚云峰    Zhuli    LI Jin-xia    QIN Fu-cang    YAO Yun-feng   作者單位： 朱麗,Zhuli(包頭師范學院,資源與環境學院,內蒙古,包頭,014030;內蒙古農業大學,生態環境學院,內蒙古,呼和浩特,010019)

李金霞,LI Jin-xia(包頭師范學院,資源與環境學院,內蒙古,包頭,014030)

秦富倉,姚云峰,QIN Fu-cang,YAO Yun-feng(內蒙古農業大學,生態環境學院,內蒙古,呼和浩特,010019) 

期 刊： 中國沙漠  ISTICPKU   Journal： JOURNAL OF DESERT RESEARCH  年，卷(期)： 2009, 29(6)  分類號： X144  關鍵詞： 風蝕荒漠化    景觀格局    鄂托克旗    動態    Keywords： blow desertification    landscape pattern    dynamic change    Etuoke county   

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