川西高山松林火烧迹地植被天然恢复过程中物种多样性动态研究

Dynamics of Species Diversity in the Natural Restoration Progress of the Pinus densata Burned Areas in Western Sichuan Province

以'空间序列'代替'时间序列'的研究方法对川西灌木高山松林不同年龄火烧迹地调查研究,结果表明:灌木高山松林火烧迹地恢复早期,物种多样性波动较大,其并非绝对随群落演替的顺向发展而增加,火烧后4～5年是群落发生剧变的时期,火烧后8～20年、20～27年是群落结构组成连续变化的时期,群落中物种多样性最大值出现在恢复27年时耐荫物种和不耐荫物种同时出现的阶段.

Through “space sequence” instead of “time sequence” method, species diversity and vegetation change were studied in the arbor layer, the shrub layer, the herb layer and the total of burned areas at different ages in the shrub Pinus densata forests. The results show that the species diversity fluctuates largely in the early stage of restoration, community structure changes sharply 4~5 years after burning, and community structure changes consecutively 8~20 and 20~27 years after the fire.The species diversity close not necessarily increase with the ordinal development of community succession. Species diversity index reaches the climax in burned areas 27 years after burning when shade-resistant plants and non-shade-resistant plants exist simultaneously.