Study On The Habitat Suitability Of Plant Species

Taking Leymus chinensis, Stipa grandis, S. krylovii, Cleistogenes squarrosa,Artemisia frigida of typical grassland in Inner Mongolia as an example,habitatsuitability of plant species were reached from the regional and landscape scale.At the regional scale, climate is the primary factors, which decides habitatsuitability of species. Based on the meteorological data of meteorological stationsin Inner Mongolia Autonomous Region and the surrounding areas, using the latestresearch methods,distribution pattern of seven climate factor including averagetemperature(T₁) in the coldest month January, average temperature(T₇) in thehottest month July, annual mean temperature(T), annual mean precipitation (P),≥0℃accumulation temperature (AT₀),≥10℃accumulation temperature(AT₁₀)and aridity index(K)were established, factors were specialize. That appropriatedistribution of climate information of Leymus chinensis, Stipa grandis, S.krylovii,Cleistogenes squarrosa and Artemisia frigida in typical grassland in InnerMongolia were accessed.At the landscape level, species which adapts climate conditions do notappear in all of the habitat.Effected by factors such as soil, terrain and humandisturbance, distributions of habitat suitability of species have spatial heterogeneity obviously.The paper take the Baiyinxile Ranch in Xilin Gole forstudy target, based on the investigation and analysis of plant communities,Thereare five grades of suitability in every community types were determined bynormalized value of niche breadth. Evaluation of the suitability was realized atcommunity level, based on the map of vegetation types study area were drawled.Take the evaluation of the suitability into space, then the spatial distribution mapof suitable habitat was generated.After analyzed the characteristics of the spatial distribution of habitat ofsuitability at landscape level and relation between it and slope, degradation degree,we found that: 1)the most suitable habitats of Leymus chinensis, S. krylovii,Cleistogenes squarrosa mainly in the gentle slope at the range of 0°～6°.Theirsuitable habitats decrease with the gradient increaser obviously, especially Leymuschinensis. For Artemisia frigida most habitats are unsuitable. Habitat suitability ofStipa grandis and gradient have no significant relation.2) Habitat suitability ofLeymus chinensis and Stipa grandis site in light degraded and moderate degradedgrassland mostly. While more S.krylovii in moderate degraded and heavydegraded grassland. Cleistogenes squarrosa is the most suitable species, it is notsensitive to grazing. Artemisia frigida is most suitable in heavy degradedgrassland though the area is small, show that Artemisiafrigida fit the high grazingpress.