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以1977年MSS及1990、2000、2005年TM影像数据为基本信息源,在RS与GIS技术的支持下,对西鄂尔多斯特有种四合木的种群动态进行了时空分析。结果表明:四合木分布区总面积约2824km2,由8个种群斑块组成,但其空间分布格局极不均衡;28 a来四合木种群数量迅速减少,且其减少速率在不同时空尺度上并不相同,而人为干扰方式及程度不同是导致四合木种群动态时空差异显著的主要原因;研究期内四合木主要向沙地、以白刺为主的其它植被及工矿用地转化,表明工业的发展及由此引发的土地沙化是四合木生存的主要威胁。
Taking the MSS in 1977 and TM image data in 1990, 2000 and 2005 as the basic information sources, the spatial and temporal analysis of the population dynamics of Siheduo Sihethu was carried out with the support of RS and GIS technologies. The results showed that the total area of Tetraena mongolica was about 2824 km 2 and consisted of 8 species patches, but its spatial distribution pattern was extremely unbalanced. The population of Tetraena mongolica decreased rapidly after 28 years, and the rate of its reduction was on different spatial and temporal scales And the difference of man-made disturbance mode and degree is the main reason that caused significant spatial and temporal difference in Siheihu population. During the study period, Sihe Mu mainly converted to sandy land and other plantations and industrial and mining land mainly dominated by white thorns Industrial development and the consequent desertification of land are major threats to the survival of Sihetun Wood.