陕西华州天然次生林林分树种组成研究

Tree Species Composition of Natural Secondary Forest in Huazhou Region of Shaanxi Province

通过对陕西省华州区秦岭南麓下岔工区和栗子沟工区天然次生林4个样方平均胸径、相对多度、相对显著度等调查统计,划分相应林分类型。结果表明:1号样方共有69株树木,12个乔木树种,优势树种组为锐齿栎、华山松、油松,林分类型为栎类纯林;2号样方有90株树木,18个树种,优势树种为锐齿栎,林分类型为阔叶混交林;3号样方有12个树种,69株树木,优势树种为锐齿栎、华山松、油松,林分类型为阔叶混交林;4号样方有9个树种,91株树木,优势树种组为华山松、油松、锐齿栎,林分类型为针阔混交林。这3种不同的林分类型以千金榆、椴树、青皮椴、漆树、青麸杨等为伴生树种,与优势树种有着密切的共生关系。

Tree species composition is one of the important forest characteristics,which is often used as the basic condition of forest classification.The corresponding forest types are classified based on the investigation and statistics of the average DBH,relative abundance and relative significance of four quadrats of natural secondary forest in Xiacha work area and Lizigou work area at south foot of Qinling Mountain,Huazhou Region,Shaanxi Province.There are 69 trees and 12 tree species in quadrat No.1,the dominant species are Quercus aliena var.acuteserrata,Pinus armandii and Pinus tabulaeformis,and the stand type is pure oak forest;there are 90 trees and 18 tree species in quadrat No.2,the dominant species is Quercus aliena var.acuteserrata,and the stand type is broad-leaved mixed forest;there are 12 tree species and 69 trees in quadrat No.3,the dominant species are Quercus aliena var.acuteserrata,Pinus armandii,Pinus tabulaeformis,and the stand type is a broad-leaved mixed forest;there are 9 tree species and 91 trees in quadrat No.4,and the dominant tree species are Pinus armandii,Pinus tabulaeformis and Quercus acutissima,and the stand type is needle broad mixed forest.These three different stand types are associated with Carpinus cordata,Tilia tuan,Acer davidii,Rhus lacquerosus and Rhus potaninii,which enjoy a closely symbiotic relationship with the dominant species.