河西走廊荒漠化地区景观格局的动态变化

 根据1996年沙漠化普查资料,结合TM影像数据和各县、市1:10万的土地利用现状图,采用景观指数对河西走廊荒漠化地区景观格局动态变化进行研究。结果表明:戈壁、暂难利用地、流动沙地和半固定沙地等嵌块体面积与人类活动强度成正相关;林地、固定沙地、水域和耕地等嵌块体的平均斑块面积与人类活动强度成反相关;全区景观多样性指数和均匀性指数呈增加态势,而景观优势度指数则呈减小态势;景观斑块破碎化指数与最小斑块面积有关;在各类型斑块中,耕地、潜在沙漠化土地、流动沙地、半固定沙地和戈壁的景观分离度有减小态势,而林地、水域的景观分离度有增加态势。

Dynamic Variation of Landscape Pattern of Desertification Area in Hexi Corridor

Based on the investigation data of desertified land in 1996 and TM images of Hexi corridor, Gansu province, landscape pattern dynamic variations of desertifiied land were studied by the landscape indices. The results shows that in the past 40 years the landscape pattern of desertification land has changed constantly. The area of unavailable land, drifting sand dune, semi-drifting sand dune and gobi patches has become larger due to human activity intervention while the mean patch area of forest land, fixed sand land, arable land area has decreased for the mean patch area, the variation tendency of landscape diversity index and evenness index has increased while landscape dominance index has decreased. The results indicates that there is an intimacy relationship between the variation of landscape pattern and human activity.