关键词: 一元多生态位, 生态位宽度, 生态位重叠, 棉花

Abstract: To study the interspecific association of plants in interdune lowland is of significance in understanding the responses of plant species to habitat change and the mechanisms of vegetation succession. Sand stabilization may affect the plant interspecific association in interdune lowland, but relevant reports are scare. In this paper, Chi-square test and association coefficient (AC) were used to analyze the interspecific associations of plants in the interdune lowlands with the areas ranging from 0.10 hm² to 5.64 hm² in the mobile and stabilized dunes in eastern Inner Mongolia. When the lowland area was smaller than 0.5 hm², the percentages of |AC|≤0.3 and |AC|≥0.7 species pairs relative to the overall species pairs were somewhat larger in stabilized dunes than in mobile dunes; but when the lowland area was larger than 0.5 hm², the percentage of |AC|≤0.3 species pairs relative to the overall species pairs was significantly smaller in stabilized dunes than in mobile dunes fields, while that of |AC|≥0.7 species pairs relative to the overallspecies pairs was in adverse. Sand stabilization less changed the interspecific association in the interdune lowlands smaller than 0.5 hm², but made the interspecific association closer in the lowlands lager than 0.5 hm².

Key words: Multiple ecological niche of one-species (variety) (MENOS), Niche breadth, Niche overlap, Cotton