林层对赣南阔叶次生林主要树种个体生长的影响

The Influence of Forest-layer on the Individual Growth of Main Species in the Broad-leaved Secondary Forest in Southern Jiangxi

阔叶次生林是赣南地区的重要森林类型之一,其森林质量影响到森林多种功能的充分发挥,森林多功能经营是提高森林质量的有效途径。以赣南地区阔叶次生林为研究对象,选取森林多功能经营后的两类阔叶次生林,通过对不同林层主要优势树种胸高断面积年均生长量对不同经营模式响应规律的研究发现:1)经营3年后,作业样地与对照样地的平均胸高断面积生长不显著,p值为0.188;2)林层是影响阔叶次生林胸高断面积生长量的重要指标,处于主林层的林木,其胸高断面积年均生长量最高,其次是次林层,而林下层个体普遍较低;3)米槠、米锥、木荷、丝栗栲等优势树种的累积胸高断面积较大,其生长量也明显高于其他树种。本研究可为阔叶次生林改造及森林质量提升提供依据和参考。

Broad-leaved secondary forest is one of the important forest types in the south of Jiangxi Province,and its quality affects forest functions.This study took the broad-leaved secondary forest in southern Jiangxi as the research object,selected two types of broad-leaved secondary forests after multi-function forest management,and studied the response rule of the average annual growth rate of the dominant tree species in different forest layers to different management modes.The main conclusions are as follows:(1)after three years of operation,the average basal ares growth of the operational and comparative lands did not grow significantly,Pr(>F)=0.188;(2)forest layer is an important index that affects the growth of broadleaved secondary forests.In the main forest layer,the average annual growth of the basal area was the highest,followed by the middle forest layer,and the under forest layer was generally lower.(3)The cumulative basal area of dominant tree species such as Castanopsis carlesii,C.chinensis,Schima superba,C.fargesii and so on is large,and its growth is obviously higher than other tree species.This study can provide the basis and reference for improving the forest quality of broad-leaved secondary forest.