珍稀特有植物四合木种群动态时空分析

Spatial-temporal change of endemic plant-Tetraena mongolica Maxim.population.

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。

Using remote sensing and geographical information system, the research analyzed 4 sensing images of Tetraena mongolica distribution region in different periods（ 1977,1990,2000,2005 ）to study the spatial- temporal changes of population dynamic of T. mongolica. The results showed ： The distribution area of T. mongolica was 2824km^2, it was composed of 8 populations and the spatial distribution of T. mongolica populations were different notability. The population of T. tnongolica was decreasing during 28 years, and the decreasing degrees of the population were varied in different spatial -temporal scales. Human disturbance and its degree resulted in the T. mongolica population dynamic. T. mongolica shrub land mainly transformed to sand land, Niteraria tan- gutorum and industry land in the research period. It indicated that the development of industry and land desertification were the main threat to T. mongolica.