甘肃白龙江2种主要次生林生物量与生产力初探  

Biomass and Productivity of Two Primary Secondary Forests in Bailongjiang,Gansu Province

作　　者：臧建伟 何永宁 ZANG Jianwei;HE Yongning(Tao River construction pipe protection center large valley forest farm,Zhoni 747600,Gansu,China)

机构地区：[1]洮河生态建设管护中心大峪林场,甘肃卓尼747600

出　　处：《贵州林业科技》2024年第1期63-66,88,共5页Guizhou Forestry Science and Technology

摘　　要：森林生物量和生产力直接关系到森林生态系统的固碳能力。本文以白龙江红桦和辽东栎次生林为研究对象,采用标准木收获法建立了生物量与胸径的相对生长方程,推算生物量、生产力及其分配规律。结果表明:(1)2022年较2019年辽东栎总生物量增加了3.17~18.3 t·hm^(-2),红桦总生物量增加16.07~16.36 t·hm^(-2),2种次生林主干、枝、叶、根生物量大小依次为主干>根>枝>叶,主干生物量占总生物量在55.6%~61.78%之间,叶片生物量在2.48%~8.83%之间;(2)2种次生林平均生产力不同,辽东栎2种结构平均生产力相差较大,红桦年平均生产力基本相同,整体生产力呈显著主干>根>枝>叶;(3)平均生产力与海拔、坡度和胸径呈正相关,郁闭度和密度呈负相关,坡度与密度呈显著性负相关。Forest biomass and productivity are closely related to the carbon sequestration capacity of forest ecosystem.This study aims to establish the relative growth equations between biomass and diameter at breast height(DBH).The secondary forests of Betula albosinensis and Quercus wutaishansea were also taken as the reach objects from the Bailong River of Gansu Province,China.The standard wood harvesting method was used to calculate the biomass,productivity and distribution.The results show that:(1)The total biomass of Quercus Liaotungensis and Betula betula increased by 3.17-18.3 and 16.07-16.36t·hm^(-2),respectively,in 2022,compared with 2019.The biomass was ranked in the descending order of the main stem>root>branch>leaf in the two secondary forests,with the trunk biomass accounting for the 55.6%-61.78%and leaf biomass the 2.48%-8.83%.(2)There was the difference in the average productivity of two secondary forests.A significant difference was found in the average productivity of Quercus Liaotungensis.But there was the same average annual productivity of red birch.The overall productivity was then ranked in the order of the trunk>root>branch>leaf.(3)The average productivity was positively correlated with the altitude,slope and DBH.By contrast,the canopy cover and density were negatively correlated,while the slope and density were significantly negatively correlated.

关 键 词：红桦 辽东栎 生物量 生产力 次生林 

分 类 号：S718.5[农业科学—林学]