关键词: 效益, 效益

Abstract: Artermisia ordosica has been highly regarded as a sand fixation plant in arid and semi-arid area of China. The research on the intraspecific competition of Artermisia ordosica population in different areas can provide a scientific basis for its conservation and restoration. The intraspecific competition of Artermisia ordosica population in arid regions was studied by using Hegyi's competition index model for individual tree, chose three typical distribution area for Artermisia ordosica, which are Shapotou Region in Ningxia Province, Mingshazui in Gulang County and Zhazigou in Minqin County in Gansu Province. The results demonstrated that, 6 meters was the optimal competition distance for intraspecific competition of Artermisia ordosica population in arid regions. The intraspecific competition in natural Artermisia ordosica population gradually became weakened with the crown width of the objective trees increasing. The competition intensity was relatively great when crown area of objective trees was less than 0.8 m2, and the competition intensity decreased rapidly with the crown area of objective trees was greater than 0.8 m2. The intraspecific competitive intensity was different in the different area. The intraspecific competitive intensity in different regions ranked in order of fixed dune in Mingshazui, the plot in Shapotou, semi-fixed dune in Mingshazui and the plot in Zhazigou. A power function was developed to describe the relationship between competition intensity and crown width of Artermisia ordosica.