秦岭中段华山松群落动态初步研究

对秦岭华山松群落的更新及群落动态分析结果表明:(1)在土壤湿度较小时,华山松群落的更新状况较好.(2)群落中华山松、锐齿栎和漆树的年龄结构都是左偏正态分布,说明华山松、锐齿栎、漆树在群落中处于进展演替的过程中,油松则在群落中比较稳定.(3)荩草+美丽胡枝子+华山松群丛的演替方向是松栎混交林;毛叶轴脉蕨+美丽胡枝子+华山松群丛和光蹄盖蕨+陕西绣线菊+华山松群丛将会形成针阔混交林;蛇梅+华山松群丛将会形成铁杉、红桦、华山松的混交林;崖棕+蔷薇+华山松群丛和深绿蒿+短梗胡枝子+华山松群丛目前暂时处于稳定状态.

Study on Community Dynamic of Pinus armandii in the Qinling Mountains

Regeneration and community dynamic of Pinus armandii are analyzed .The results were as follows: (1) Soil moisture may be one of the most important factors, which effect the seedling number. Only when the soil was not very wet, the regeneration was better. (2)The diameter structure of P. armandii, Toxicodendron vernicifluum and Quercus aliena var. alcuteserrata were left deflection normal distribution,so they are evolutional populations. That of P. tabulaefomis is normal distribution, this suggested that it was a stable population in the P. armandii forest community. (3) Ass.Arthraxon hispidus+Lespedeza formosa+ P. armandii would evolve into pine and oak mixed forest. Ass.Ctenitopsis devexa+ L. formosa+ P. armandii and Ass.Athyrium otophorum+Spiraea wilsonii+ P. armandii will evolve into coniferous and broadleaf mixed forest. Ass.Duchesnea indica+ P. armandii will evolve into Betula. albo-sinensis, Tsuga chinensis and P. armandii mixed forest. Ass.Carex siderosticta+Rosa multiflora+ P. armandii and Ass.Artemisia atrovirens+L. cyrtobotrya+ P. armandii will be in its temporarily stable condition.