长江中上游低质低效次生栎林的分类与评价

对林分的生长过程、形成原因和功能特征进行了分析 ,建立了栎类低质低效林综合等级的判别函数 ,将林分划分为四种类型 :极低质低效型、生长潜力型、低质型、综合低质低效型。对林分立地因子的逐步回归分析表明 ,影响栎林生长的主导立地因子依次为海拔、土层厚度和坡向 ,它们的组合可以构成不同的立地条件类型。根据对各等级的林分生长过程及其立地特征的分析 ,提出了划分栎类低质低效林的技术参数标准

Classification and Evaluation on the Low-quality and Low-benefit Secondary stand of Oak along the Middle and Upper Reaches of the Yangtzi River

Based on the analysis of the growth process and the courses that results in the stand development and the function features of the stands, we established the judge function of incorporate grades of the low quality and low benefit Oak secondary stands and divided it into four types: the extremely low quality and low benefit type, the potential type, the low quality type and the incorporate low quality and low benefit type Gradual regression analyses on the site factors shows that the main site factor that effects the growth are ordinally the altitude above sea level, the soil depth and the slope direction; the combination of them can constitute various site types Based on the analysis of the stands growth process and the site features , we provided the parameter criteria for sorting out the low quality and low benefit secondary stands