延安丘陵溝壑區土地利用類型坡度分異研究
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國家科技攻關項目(2004BA522D071)“西北地區生態環境動態監測”、“綜合評價和應用服務系統研究”資助


Land Use and Slope Gradient Differentiation over Yan’an Hilly and Gully Area
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    摘要:

    選取典型黃土高原丘陵溝壑區的延安市寶塔區,利用遙感和地理信息系統技術,通過監督分類方法得到1997~2004年間該地區的土地利用分類圖,并結合DEM(數字高程模型)坡度信息,分別提取1997年、2004年的坡耕地、坡林地、坡草地和坡園地數據,對該地區土地利用類型變化及坡度分異進行深入分析。結果表明:①在1997~2003年,耕地面積減少了33.1%,林地增加了10.1%、草地增加了20.6%、果園面積增加了33.3%,使該區域生態環境整體得到改善;②耕地減少的面積主要集中發生在坡耕地部分,其中坡度大于等于

    Abstract:

    The landuse classification charts in 1997 and 2004 are acquired by means of the remote sensing,GIS, and supervised classification methods for the hilly and gully area (Baota district) in Yan’an. Combined with the local DEM (digital elevation model) slope data, an analysis is made of the landuse distribution variation and differentiation with the data of the slope farmland, slope woodland, slope pasture and slope orchard for the years of 1997 and 2004, respectively. The results show that: (1) During the six years from 1997 to 2003, farmland decreased by 33.1%, woodland increased by 10.1%, pasture increased by 20.6%, orchard increased by 33.3% and the ecological environment of the studied area is improved generally. (2) The slope farmland decrease is mostly obvious, with the 55.5% of decrease occurred in the area of >35° and 51.2% in 25° to 35°. The decreased slope farmland was mainly converted into slope woodland, slope orchard, and mostly the slope pasture. However, the proportion of the irrigable farmland to total farmlands increased while the total farmland decreased. Analysis shows that the preliminary achievements are attributed to the execution of the government’s forestation project.

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卓靜,鄧鳳東,劉安麟,周輝,趙青蘭.延安丘陵溝壑區土地利用類型坡度分異研究[J].氣象科技,2008,36(2):219~222

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  • 收稿日期:2007-03-19
  • 定稿日期:2007-05-29
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