杉木和福建柏混交林中福建柏天然更新幼苗幼树空间分布  

Spatial Distribution Pattern of Naturally Regenerated Seedlings and Saplings of Fokienia hodginsii under mixed forest of Chinese fir and Fokienia hodginsii

作　　者：颜建北 YAN Jian-bei(Datian Forestry Bureau ,Datian Fujian 366100,China)

机构地区：[1]大田县林业局,福建大田366100

出　　处：《青海农林科技》2021年第4期80-83,88,共5页Science and Technology of Qinghai Agriculture and Forestry

基　　金：国家林业公益性行业科研专项“重要乡土树种核心种质评价及高效育种共性技术研究”子课题福建柏种质资源评价与新品种选育及繁育技术(项目编号:201004009)。

摘　　要：本文以福建省大田桃源国有林场杉木和福建柏混交林分为研究对象,探讨天然更新福建柏幼苗幼树空间分布格局,通过对样地调查,分析更新层不同高度级的福建柏密度分布情况,采用空间分布型聚集度指标进行测定,结果表明:福建柏天然更新幼苗的密度随不同高度级呈现出先急剧下降,然后上升,再缓慢上升,第二高峰后又逐渐缓慢下降,而后迅速下降的规律,其中第一个高峰天然更新幼苗的密度为6892株·hm^(-2)(苗高<30cm),第二个高峰天然更新幼苗的密度为1238株·hm^(-2)(苗高150-180cm)。福建柏的幼苗空间格局分布为聚集—均匀—聚集—均匀—聚集交替出现。福建柏幼苗回归模型为m*=-0.30658+3.12642x和lgs^(2)=0.44953+1.71327lgx,福建柏幼树回归模型为m*=-2.71252+5.15761x和lgs^(2)=0.44044+3.37970lgx,说明福建柏的幼苗幼树整体表现聚集分布的空间格局。In this paper,the mixed forest of Chinese fir and Fokienia hodginsii in Datian Taoyuan State-owned Forest Farm in Fujian Province is divided into research objects to discuss the spatial distribution pattern of natural regeneration of Fokienia hodginsii seedlings and saplings,and analyze the density distribution of Fokienia hodginsii at different heights in the regeneration layer through the investigation of sample plots.Using the spatial distribution type aggregation index to measure,the results show that the density of natural regeneration seedlings of Fokienia hodginsii decreases sharply,then rises,then rises slowly with different height levels,and then gradually decreases slowly after the second peak,and then decreases rapidly.The density of natural regeneration seedlings in the first peak is 6892 plants·hm^(-2)(seedling height<30cm),and the density of natural regeneration seedlings in the second peak is 1238 plants·hm^(-2)(seedling height 150-180cm).The spatial distribution pattern of the seedlings of Fokienia hodginsii is aggregation-uniform-aggregation-uniform-aggregation alternately.The regression model of Fokienia hodginsii seedlings is m*=-0.30658+3.12642 and lgs^(2)=0.44953+1.71327lg,the regression model of Fokienia hodginsii saplings is m*=-2.71252+5.15761x和lgs^(2)=0.44044+3.37970lgx,indicating that the overall spatial pattern of accumulation and distribution of the seedlings and saplings of Fokienia hodginsii.

关 键 词：杉柏混交林 天然更新 空间分布 

分 类 号：S79[农业科学—林木遗传育种]