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2012年8月在长白山林区云冷杉针阔混交林中设置一块60 m×60 m典型更新样地,采用地统计学的半方差函数分析方法、分形维数和Kriging插值方法,分析林下天然更新幼苗幼树的空间分布格局及其异质性.结果表明:云冷杉针阔混交林更新层幼苗幼树以冷杉和色木槭为主,占更新总数的87.4%;样地中更新幼苗幼树呈聚集分布,聚集斑块最大半径为9.93 m;更新幼苗幼树之间具有很强的空间自相关性,其88.7%的变异由结构性因素(生物学、生态学特性和环境异质性)引起,11.3%的变异由随机性因素引起;更新幼苗幼树的空间分布表现出各向异性,南北方向上的分形维数最小,异质性最高,东北-西南方向上的分形维数最大,异质性最低;更新幼苗幼树树高比地径的空间异质性强;更新幼苗幼树地径和树高的空间自相关范围分别为29.97和31.86 m,随机因素和结构因素对其空间异质性的影响具有同等作用.
In August 2012, a typical 60 m × 60 m plot was set up in a coniferous and broad-leaved mixed forest of Spruce-fir forest in Changbai Mountains. Geostatistical semi-variance function analysis method, fractal dimension and Kriging interpolation method were used to analyze natural forest understory The results showed that the young seedlings of the regeneration layer of Fir spruce-fir-fir mixed forest were mainly Firs and Acer truncatum, accounting for 87.4% of the total, and the seedlings were younger The tree was aggregated and distributed, and the maximum radius of the aggregated patches was 9.93 m. There was a strong spatial autocorrelation between the seedlings and juveniles, and 88.7% of the variance was caused by the structural factors (biological, ecological and environmental heterogeneity ), And 11.3% were caused by random factors. The spatial distribution of seedling sapling showed anisotropy with the smallest fractal dimension in the north and south direction, the highest heterogeneity and the largest northeast-southwest fractal dimension , And the least heterogeneity. The spatial heterogeneity of height-to-height ratio of seedling saplings was higher than that of the control. The spatial autocorrelation ranges of seedling diameter and tree height were 29.97 and 31.86 m, respectively. The random and structural factors The impact of spatial heterogeneity is the same And so on.