基于森林健康的刺槐人工林抚育间伐效果研究

Effect of Thinning Different Age Locust Plantations on Their Health in Loess Plateau

通过对不同林龄不同间伐强度的刺槐人工林进行对比研究,确定出能有效提高刺槐人工林健康状况的间伐强度,为刺槐人工林健康经营提供科学理论依据。基于科学性、系统性和可操作性的原则,在永寿县槐坪林场36块样地中,通过活力、结构和抗逆性3个方面选出9个评价指标。采用层次分析与聚类分析法,构建刺槐人工林评价模型,计算各样地的健康指数,根据健康指数,将处于不同龄级的刺槐林划分为健康、亚健康和不健康3个等级,进而对样地进行健康评价。结果表明在不同间伐强度的林分中,进行了25%间伐强度的刺槐人工林最好,未经过间伐的林分状态最差,幼龄林要比中龄林和近熟林的健康状况要好。总体看来,在永寿县槐坪林场的刺槐人工林总体处于亚健康状态,健康林分占其中的25%,亚健康林分占55.6%,不健康林分占19.4%。25%强度间伐能有效的提高刺槐人工林的健康状况,当地林业部门应及时进行适当的间伐。

A comparative study of thinning for different ages in thinning intensities in plantation was conducted to determine their effect on the health of Locust Plantation.The study was based on the principle of scientific,systematic and operability,36 sample plots were surveyed in Huaiping forestry in Yongshou County and nine indicators from the vigor,structure and resistance were selected for assessment with the tool of Analytic Hierarchy Process and Cluster Analysis.Health indexes of every sample plots were calculated.According to health indicators,the black locust plantations of different ages will be divided into healthy,sub-healthy and unhealthy grades.The result showed that 25%thinning intensity was the healthiest,the forests with no thinning intensity were the worst,young forests were better than immature timbers and near-mature forests.Overall,the black locust plantations in Yongshou were assessed in terms of healthy grade:healthy grage about 25%,sub-healthy grade 55.6%and unhealthy grade 19.4%.The analysis showed that 25%thinning intensity can effectively improve the health status of Locust Plantations,local forestry department shall promptly make the appropriate thinning.