油松天然林林分空间结构特征  

Stand spatial structure characteristics of Pinus tabuliformis natural forest

作　　者：武秀娟 奥小平 姚丽敏 田建华 WU Xiujuan;AO Xiaoping;YAO Limin;TIAN Jianhua(Shanxi Academy of Forestry and Grassland Sciences,Taiyuan 030012,Shanxi,China)

机构地区：[1]山西省林业和草原科学研究院,山西太原030012

出　　处：《中南林业科技大学学报》2024年第2期83-90,共8页Journal of Central South University of Forestry & Technology

基　　金：山西省林业重点研发计划专项(LYZDYF2023-14,2022LYCX);山西省重点研发计划项目(201603D321004)。

摘　　要：【目的】分析灵空山自然保护区典型森林类型即油松天然林的空间结构并对其进行评价,旨在为油松天然林空间结构优化措施的制定提供理论支撑。【方法】以灵空山自然保护区的油松天然林为研究对象,采用角尺度、大小比数、混交度、林层指数和开敞度5个指数分析油松天然林的空间结构特征,并利用熵权法确定权重进而构建空间结构综合指数,对其空间结构进行分级评价。【结果】油松天然林林分角尺度均值为0.54~0.66,林分空间分布格局总体上呈聚集分布;阳坡林分平均混交度为0.20,属弱度混交,其他立地林分混交程度介于中度与强度混交之间;林分大小比数均值为0.35~0.50,大小分化程度为中庸或近中庸状态;林分平均林层指数为0.29~0.41,且阴坡林层指数高于阳坡,林层结构总体较为简单,但阴坡林层结构较阳坡丰富;林分平均开敞度为0.37~0.52,林分内光照条件总体均达到了基本充足及以上,但半阴坡和阳坡半数以上油松光照条件受限;油松天然林林分空间结构综合指数为0.313 5~0.543 5,评价等级分属2、3级,半阴坡油松和阴坡辽东栎的空间结构综合指数分别为0.283 6和0.253 3,均属2级。【结论】灵空山油松天然林林分结构整体状况较差或一般,需进行结构优化调整,半阴坡油松和阴坡辽东栎的结构调整需求更为迫切,空间结构综合指数可作为优化调整油松天然林林分空间结构的依据。【Objective】In order to provide theoretical support for optimizing the stand spatial structure,it is necessary to analyze and evaluate the stand spatial structure of Pinus tabulaeformis natural forest in the nature reserve of Lingkong mountain.【Method】Taking the natural P.tabulaeformis forest in the nature reserve of Lingkong mountain as the research object,five spatial structure parameters(Uniform angle index,neighborhood comparison,mingling index,storey index and open degree of stand)were selected to analyze the spatial structure characteristics of the natural P.tabulaeformis forest,the entroy weight methods were used to construct a comprehensive index of spatial structure for hierarchical evaluation of spatial structure.【Result】The mean uniform angle indexes of the natural P.tabulaeformis forests were between 0.54 and 0.66.The spatial pattern was mainly clustering distributions.The mean mingling degree on sunny slope was 0.20,indicating that the overall stand was in weak mixed state,and those on the other slope aspects were belonging to the intermediate state of moderate and intensity.Stand neighborhood comparisons were between 0.35 and 0.50,the overall stands were closed to moderate neutral state.Stand layer index averages were between 0.29 and 0.41,and the average on shady slope was higher than that on sunny slope,stand layer structure was relatively simple,but the structure on shady slope was complex than that on sunny slope.The open degree of mean values were between 0.37 and 0.52,indicating that the light condition of entire stand was overall good,but light conditions of 50%trees of P.tabulaeformis on semi-shady slope and sunny slope were constrained.The comprehensive index of stand spatial structure was between 0.3135 and 0.5435,the evaluation grades of spatial structure were 2 and 3.The comprehensive indexes of P.tabulaeformis on semi-shady slope and Quercus wutaishanica on sunny slope were 0.2836 and 0.2533 respectively,and their evaluation grades were 2.【Conclusion】The spatial structure

关 键 词：油松天然林 空间结构 林分空间结构综合指数 熵权法 

分 类 号：S758.53[农业科学—森林经理学]