河南主要山区栎类天然次生林幼树更新特征及影响因子

Regeneration Characteristics and Related Factors Affecting Saplings in Quercus Secondary Forest of Main Mountainous Areas in Henan Province

基于河南太行山区、伏牛山北坡、伏牛山南坡共45块栎类次生林样地数据,分析乔木幼树更新特征及其影响因子,旨在探究河南省主要山区栎类次生林天然更新规律。研究结果表明:(1)河南省3个主要山区栎类次生林天然更新数量多但质量低,更新幼树密度均超过8000株/hm^(2),但平均高度仅为0.5~0.7 m;(2)栓皮栎是研究区域栎类次生林的主要优势树种,3地区天然更新栓皮栎幼苗重要值分别为69%、42%、41%;(3)栎类天然次生林幼树更新与环境及林分因子关系复杂,与幼树更新指标呈负相关的影响因子主要有坡度、林分密度、草本高度,呈正相关的影响因子主要有海拔、草本盖度、灌木盖度、土层厚度等。

Based on the data of 45 Quercus secondary forest plots in the Taihang Mountains,northern slope of Funiu Mountain,and southern slope of Funiu Mountain in Henan Province,the growth status,natural regeneration status,and influencing factors of trees were analyzed aim to find out the growth status and natural regeneration mechanism of Quercus secondary forests in the main mountainous areas of Henan Province,in order to provide theoretical basis for improving the management technology of Quercus secondary forests and revealing the natural regeneration mechanism of Quercus secondary forests.The results show that:(1)The natural regeneration of oak secondary forests in the main mountainous areas of Henan Province is large in quantity but low in quality.The density of regeneration saplings exceeds 8000 plants/hm^(2),but the average height is only 0.5-0.7 m.(2)Quercus variabilis is the main dominant tree species of oak secondary forest in the study area,the important values of natural regeneration seedlings of Quercus variabilis are 69%,42%and 41%respectively.(3)The relationship between the natural regeneration status of Quercus natural secondary forest and the environment and stand factors is complex.The factors that are negatively correlated with the natural regeneration index of saplings are slope,stand density and herb height,and the factors that are positively correlated are elevation,herb coverage,shrub coverage and soil thickness.