关键词: 开矿, 草原, 变异性, 互补效应

Abstract: Mining changes the community structure and composition of grassland. We conducted an experiment to study the variability of aboveground biomass in grassland communities and the compensatory effect among species. We took Stipa grandis steppe around Baiyinhua mining area in Inner Mongolia as the research object,and analyzed community composition,the variability of aboveground biomass at different organization levels (species,functional groups and communities) and the compensatory effect among species/functional groups. We found that the common species were Stipa grandis,Carex korshinskyi,Cleistogenes squarrosa,Leymus chinensis,Agropyron cristatum and Anemarrhena asphodeloides， and the cumulative relative importance value of the six species was 79.63%. Secondly,at the species and functional group levels,the variability decreased with the increase of aboveground biomass (R²=0.24,P<0.01;R²=0.63,P<0.05). In addition,with the increase of organizational level,the rank of the variability levels was population (587.13%) > functional groups (237.94%) > community (44.65%). Moreover,the compensatory effect mainly existed between dominant species and dominant or non-dominant species,between dominant functional groups and dominant or non-dominant functional groups,and the possibility of compensatory effect between non-dominant species and non-dominant species and between non-dominant functional group and non-dominant functional group was small. In the process of mining,both economic and ecological aspects should be taken into account in order to keep the grassland community stable.

Key words: Mining, Grassland, Variability, Compensatory effect