甘肃小陇山5种不同灌木林改造模式对比分析

运用林分空间结构参数角尺度、混交度、大小比数和树种多样性指数等指标对甘肃小陇山5种不同灌木林改造模式的林分组成、结构特征以及树种多样性进行评价,研究表明:带状割灌营造的华山松林模式从树种组成、林分结构以及树种多样性等各方面优于其它模式,林分更易形成异龄混交林,是一种较好的改造模式;带状割灌改造较全面割灌改造更有利于提高林分的树种多样性,增加林木个体分布的随机性和混交程度;其它改造模式的林分状态并不完全表现为人工纯林的特征,在今后的经营中,可以通过优化林分空间结构促使现有林趋向进展演替,实现人工林自然化.

Compara tive Ana lysis of Five Shrub Forest Transforma tionModels on Xiaolongshan in Gansu

In order to know about the stands state of five shrub forest transformation models and give somemanagement advices on Xiaolongshan in Gansu, the paper used spatial structure parameters of the angle index,mingling, neighborhood comparison and species diversity indictor to study the stand composition, structure featuresand species diversity, the result showed that the zonal cutting shrub p lanting Pinus a rm and iimodelwas better thanothermodels in composition, stand structure, species diversity and the stands were easier to become uneven-agedmixed forest, while the zonal cutting shrub p lanting was benefit in imp roving species diversity, mingling anddistributing in random pattern than overall cutting shrub p lanting. In future is management, some measurementscould be adevp ted to op timize the structure and space allocation, so as to p romote the p rogress of stands successionand achieve naturalization.