濒危植物四合木的生境适宜性评价

Habitat Suitability Assessment of Endangered Plant Tetraena mongolica Maxim.

以TM影像数据为基本信息源,在GIS技术支持下,选取地形、土壤、气候、人类活动指标为评价因子,借助DEM及生境评价模型,对鄂尔多斯特有植物四合木的生境进行了不同层面的适宜性评价。结果表明,地形与气候等自然因素不是四合木生存与发展的限制性因素,而人类活动使四合木的实际生境质量无论在分布上还是数量上均发生了较大变化;与潜在生境相比,已有23.87km2的实际可生存生境退化为较不适宜生境,说明人类活动可能是导致四合木局部濒危的关键因素。在各生境类型区内,四合木的潜在及实际生境质量均有较大差异。其中,乌家庙、低山、棋盘井种群的生境质量较好,而乌达与千里山种群的生境质量较差。

Based on Landsat TM images and GIS technology, the paper assessed the habitat suitability of endangered plant Tetraena mongolica in western Ordos Plateau by selecting terrain, soil, climate and human activities factors as assessment indices and using Digital Elevation Model and Habitat Assessment Model. The results were as follows. Natural factors such as climate and terrain weren＇t the restrictive factors of survival and development of T. mongolica in the research region, whereas human activities made the habitat quality of T. mongolica change intensively in quantity and distribution. Compared with the potential habitat suitability, the area of practically less suitable habitat increased 23.87 km2. It showed human activities may be the key factor resulting in the endangered of T. Mongolica in some area. There was obvious difference of potential and practical habitat suitability between different habitat regions of the study area. The habitat quality was better in Wujiamiao, Dishan and Qipanjing regions, and it was worse in Wuda and Qianlishan regions.