中文摘要：

丘间低地植物种间关联研究对揭示植物对生境变化的响应及植被演替机制具有重要意义。通过χ2检验和AC关联系数对科尔沁沙地22个不同面积的流动沙丘区和固定沙丘区丘间低地植物种间关联进行了比较分析。结果表明：在固定沙丘区,当丘间低地面积〈0.5hm^2时,｜AC｜≤0.3的种对数占所有种对数的百分比和｜AC｜≥0.7的种对数占所有种对数的百分比略大于流动沙丘区,当丘间低地面积＆gt;0.5hm2时,｜AC｜≤0.3的种对数占所有种对数的百分比显著小于流动沙丘区,｜AC｜≥0.7的种对数占所有种对数的百分比显著大于流动沙丘区;当面积〈0.5hm2时,沙丘固定未引起丘间低地植物种间关系发生明显变化;当面积〉0.5hm2时,沙丘固定导致丘间低地植物种间关系更加紧密。

英文摘要：

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 hm^2 to 5.64 hm^2 in the mobile and stabilized dunes in eastern Inner Mongolia. When the lowland area was smaller than 0. 5 hmz, 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 hm^2, 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 hm^2, but made the interspecific association closer in the lowlands lager than 0. 5 hm^2.