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【目的】揭示大明山常绿阔叶林灾后恢复中冠层结构的空间变化规律及空间异质性动态,为监测灾后受损森林生态系统的恢复能力及灾后管理提供理论依据。【方法】对2008年特大冰冻干扰后大明山常绿阔叶林的林冠结构进行连续4年的监测,采用半变异函数对其林冠开度和叶面积指数进行空间异质性分析。【结果】随着恢复时间的延长,大明山常绿阔叶林冠层结构已有较大恢复,2011年林冠开度最小、叶面积指数最大。2011年和2012年林冠开度的空间变异程度大幅增加,结构性因素引起的空间变异大于随机因素;2010年叶面积指数的空间异质性大幅度增加,但随后2年其空间异质性大幅度降低并趋于稳定,空间异质性尺度较小且主要由结构性因素引起。【结论】随着恢复演替的进行,大明山常绿阔叶林林冠结构在空间上向着越来越不均匀的方向发展,而叶面积指数则逐渐趋于稳定。
【Objective】 The purpose of this study was to reveal the spatial variation of spatial structure and spatial heterogeneity of the canopy structure in the evergreen broad-leaved forest in Daming Mountain, and provide a theoretical basis for monitoring the resilience and disaster management of damaged forest ecosystems. 【Method】 The canopy structure of the evergreen broad-leaved forest in the Daming Mountain after 2008 super-freeze disturbance was monitored for 4 consecutive years. The spatial heterogeneity of the canopy opening and leaf area index was analyzed by semi-variogram. 【Result】 With the prolongation of recovery time, the canopy structure of evergreen broad-leaved forest in Daming Mountain has recovered greatly. In 2011, the canopy opening degree was the smallest and the leaf area index was the largest. The degree of spatial variation of the canopy opening increased significantly in 2011 and 2012. The spatial variability caused by the structural factors was larger than the random factor. The spatial heterogeneity of the leaf area index increased significantly in 2010, but the spatial heterogeneity Magnitude decreases and tends to be stable, with small spatial heterogeneity and mainly due to structural factors. 【Conclusion】 With the succession of restoration succession, the canopy structure of the evergreen broad-leaved forest in the Daming Mountain spatially tends to be more and more uneven, while the leaf area index gradually tends to be stable.