秦岭中段华山松林健康评价研究

Health Evaluation of Pinus armandi in the Middle of Qinling Mountains

本实验以秦岭中段华山松林为研究对象,在秦岭中段的火地塘林区,按照不同的立地条件,设置26块20 m×20 m的标准样地,以生态服务功能为依据,从活力、组织结构、土壤因素、抵抗力4个方面22个指标入手,对秦岭中段华山松林生态系统健康状况进行健康评价。结果表明：秦岭中段的华山松林整体活力指标较低,大部分都处在20~35年之间,平均树高为11.73 m,平均胸径为17.77 cm,样地的平均密度为1 233.6株/hm2,属于中林龄到成熟林过渡的阶段,样地乔木平均蓄积量小于40 m3,林分更新在1 000~2 000株/hm2,后备资源不足。通过相关性分析和实地调查相结合,发现林分的郁闭度和乔木的多样性是影响其健康程度的直接因子。

In this experiment,the health of Pinus armandi forest in Qinling Mountains was studied with 26 sampling plots of 20 m×20 m serving different ecological functions in terms of 22 indicators covering four aspects like energy,organizational structure,soil factors,resistance according to different site conditions.The results showed that： activity indicators of Pinus armandi forest in the middle section of Qinling Mountain are lower,mostly 20~35 years with the average height of 11.73 m,the average DBH of 17.77,the average density of plot： 1 233.6 hm2,and canopy density of 57.3,belonging to the transitional stage from middle age to mature age.The plots have the average tree volume less than 40m3,with regeneration seedlings at 1 000~2 000 hm2,not sufficient for regeneration.Through correlation analysis and the field survey,it was found that the canopy density and tree stand diversity are the direct factors affecting the health of forest.