望天树天然林幼苗更新及生长与环境因子的关系  

Relationship Between Seedling Regeneration,Growth and Environmental Factors in Parashorea Chinensis Natural Forest

作　　者：刘奎[1] 黄宝榴 陈凯 杨梅[1] LIU Kui;HUANG Bao-liu;CHEN Kai;YANG Mei(Forestry Institute of Guangxi University,Nanning 530004,China;Liangfengjiang National Forest Park,Nanning 530000,China)

机构地区：[1]广西大学林学院,中国南宁530004 [2]良凤江国家森林公园,中国南宁530000

出　　处：《湖南师范大学自然科学学报》2018年第4期47-53,共7页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金资助项目(31260176);广西自然科学基金资助项目(2015GXNSFAA139081)

摘　　要：探讨环境因子与望天树天然林更新的内在联系,为保护望天树天然林、建立自然保护区提供基础的数据支撑.以广西田阳县和那坡县的望天树天然林为研究对象,对样地内所有望天树进行每木检尺并调查环境因子,使用灰色关联度和相关性方法分析望天树更新密度与环境因子之间的关系.结果表明:在更新苗中,5级更新苗(幼树,H≥1 m,DBH<5 cm)分布数量最大,3级更新苗(50 cm≤H<75 cm)在过渡到4级更新苗(75 cm≤H<100cm)的过程中死亡率较高;望天树幼苗更新密度与空气湿度和林分郁闭度的关联度最高;空气湿度与望天树更新苗的树高呈极显著负相关关系,与更新密度极显著正相关(P<0.01),望天树天然林更新苗的树高地径与更新密度、郁闭度、土壤铵态氮、植被盖度、凋落物厚度、土壤速效钾呈负相关关系,但是均未达到显著水平.This paper discusses the intrinsic relationship between environmental factors and the regeneration of Parashorea Chinensis natural forests, and henceforth should provide the basic data support for the protection of Parashorea Chinensis natural forest and the establishment of natural reserves. Taking the Parashorea Chinensis natural forest in Napo county, Tianyang county, Guangxi as the research object, we investigated all the trees and the environmental factors in this work. The grey correlation and correlation methods were used to analyze the relationship between the density of Parashorea Chinensis seeding update and environmental factors. Our results show that the distribution of five grade seedlings （saplings, H ≥1 m, DBH 〈5 cm） is the largest in the updated seedlings. Grade 3 renewal seedlings（50 cm≤ H 〈75 cm） have a higher mortality rate during the transition to Grade 4 renewal seedlings（75 cm≤ H 〈100 cm）. Parashorea Chinensis regeneration densities possess the highest correlation with air humidity and canopy density. There is a highly significant negative correlation between the seedling height and air humidity. There exists a highly significant positive correlation between seedling height and regeneration densities with P 〈0.01. The height and ground diameter of the tree and regeneration density, canopy density, soil ammonium nitrogen, vegetation cover, litter thickness, and soil available potassium are all negatively correlated, though none of them reaches the significant level.

关 键 词：望天树 环境因子 天然更新 灰色关联度 土壤养分 生长 

分 类 号：S792.99[农业科学—林木遗传育种]