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密云水库上游典型油松林地林木生长空间格局 被引量:2

Spatial pattern of growth in a typical Pinus tabulaeformis forest in upper reaches of Miyun reservoir
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摘要 【目的】植被空间格局是植物群落生态特征、种间竞争等分析的基础,对了解植物群落生态学特征及过程具有重要意义。本研究试图探讨样地林分树高和胸径的空间异质性,以期获得北京山区优势种群的空间分布格局与空间分布特征。【方法】选择生长良好的林分设置固定观测样地(100 m×100 m),对所有树木进行每木检尺,明确样地内树种组成、结构特征与径级结构,基于各立木在二维空间上的坐标构建点图,分析林木聚集特征;应用变异函数分析方法了解林木空间异质性特征,采用Kriging空间插值统计学方法分析样地内林木树高及胸径等生长特征的空间分布特征。【结果】研究样地内共有树种13种,共计株数833株,其中油松为其优势树种,占78.75%,在部分区域呈现高度聚集分布;栓皮栎、黄栌、山杏等其他树种混交分布其中,在部分区域有小范围的聚集;样地内所有林木还是优势树种油松林木,其径级分布均接近于正态分布,随着径级的增加,个体数呈先增大后减小的单峰变化趋势;树高和胸径均以指数理论模型的拟合效果较好,树高值的空间异质性不高,而胸径值的空间异质性较高,树高和胸径均表现出中等程度的空间自相关性;林木树高的空间分布呈连片分布,胸径的空间分布呈斑块分布。【结论】林分在小尺度上存在聚集效应,林木生长存在空间异质性,其空间格局表现为连片和斑块状分布。 【Objective】The spatial pattern of vegetation is the basis of the analysis of ecological characteristics and interspecific competition of plant community,which is of great significance to understand the ecological characteristics and process of plant community.This study try to analyze the spatial heterogeneity of tree height and DBH in sample plots in order to obtain the spatial distribution pattern and characteristics of dominant populations in Beijing mountainous area.【Method】Fixed observation plots(100 m×100 m)were set up for well-growing stands,and the tree species composition,structure and diameter class structure were determined.Point maps were constructed based on the coordinates of each tree in two-dimensional space to analyze the characteristics of tree aggregation.Variogram analysis was used to understand the spatial heterogeneity of trees,and Kriging space interpolation was used.The spatial distribution characteristics of tree height and DBH were analyzed by value statistics.【Result】There were 13 species and 833 trees in the sample plot,of which Pinus tabulaeformis was the dominant tree species,accounting for 78.75%,showing a highly aggregated distribution in some areas;other tree species were mixed and distributed in some areas,with a small aggregation in some areas;all trees or dominant tree species Pinus tabulaeformis forest in the sample plot,their diameter distribution was close to normal distribution.With the increase of diameter class,the number of individuals increased first and then decreased.The fitting effect of exponential theory model was better for tree height and DBH.The spatial heterogeneity of tree height value was not very high,but DBH value was higher,and the spatial autocorrelation of tree height and DBH was moderate.The spatial distribution of tree height was continuous and DBH was spatial.The distribution was patchy.【Conclusion】There is aggregation effect on small scale and spatial heterogeneity in forest growth.The spatial pattern of forest growth is contiguous a
作者 卢泽洋 王贺年 LU Zeyang;WANG Henian(Academy of Forestry Inventory and Planning of National Forestry and Grassland Administration,Beijing 100714,China;Institute of Wetland Research,Chinese Academy of Forestry,Beijing 100091,China)
出处 《中南林业科技大学学报》 CAS CSCD 北大核心 2020年第7期1-8,共8页 Journal of Central South University of Forestry & Technology
基金 国家自然科学基金项目(51809265)。
关键词 密云水库 油松 空间格局 树高 胸径 Miyun reservoir Pinus tabulaeformis spatial pattern tree height diameter at breast height
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