Simulation of Distribution Pattern of Dominant Grass Species in Tibetan Plateau Based on the Maxent Model
Taking Kobresia,Carex and Stipa as the research objects.The grassland specimen point data were obtained by querying the her-bology database and the climate,soil texture and topography were selected as environmental factors to explore the influence and internal mech-anism of the dominant environmental factors on the distribution of different grasslands,the Maxent model was used to simulate the distribution pattern of each dominant grass and the Jackknife method was used to screen out the dominant environmental factors.The results showed that the precipitation in the coldest season,the standard deviation of the seasonal variation of temperature,the average annual precipitation and the altitude were the dominant environmental factors for the distribution of Kobresia(accumulated contribution rate>80%);the precipitation in the coldest season,the average temperature in the warmest season,the average annual precipitation,and the altitude had a greater contribution to the distribution of Carex(accumulated contribution rate was 82.55%);the warmest season precipitation,the annual average temperature,the slope and altitude had the greatest influence on the geographical distribution of Stipa(accumulated contribution rate was 73.47%).Soil texture had little effect on this three grassland species(accumulated contribution rate<5%).In general,the hydrothermal conditions in the growing season were the most important climatic factors that restrict the distribution of dominant species on the Tibetan Plateau.
国家科技期刊平台
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