抚育强度对不同林型“栽针保阔”红松林碳源/汇影响  

Effects of tending intensity on carbon source/sink of Korean pine forests with different forest types by planting coniferous forest and reserving broadleaved forest

作　　者：杨智慧 牟长城 王亚辉 李轩男 刘珽 Yang Zhihui;Mu Changcheng;Wang Yahui;Li Xuannan;Liu Ting(Center for Ecological Research,School of Forestry,Northeast Forestry University,Harbin 150040,Heilongjiang,China)

机构地区：[1]东北林业大学林学院,生态研究中心,黑龙江哈尔滨150040

出　　处：《北京林业大学学报》2023年第6期19-32,共14页Journal of Beijing Forestry University

基　　金：国家重点研发计划(2022YFF1300502-1);“十三五”国家重点研发计划(2017YFC0504102)。

摘　　要：【目的】揭示透光抚育对不同林型中期“栽针保阔”红松林碳源/汇影响规律,为恢复地带性顶极植被阔叶红松林提供依据。【方法】运用静态箱-气相色谱分析及相对生长方程法,同步测定小兴安岭3种中期“栽针保阔”红松林(蒙古栎红松林、白桦红松林和山杨红松林冠下栽植红松25~35年及透光抚育25~30年)在不同透光抚育强度(对照、轻度透光抚育、强度透光抚育)下的土壤异养呼吸净碳排放量(CO_(2)和CH_(4))、植被年净固碳量及相关环境因子(温度、土壤含水率、有机碳、全氮等),并依据生态系统净碳收支,确定林型和透光抚育强度对中期“栽针保阔”红松林碳源/汇的影响规律及其机制。【结果】(1)3种林型土壤CO_(2)年均通量(159.94~207.43 mg/(m^(2)·h))既受透光抚育强度影响(强度透光抚育使蒙古栎红松林显著提高18.9%),也受林型影响(对照林分白桦红松林显著大于蒙古栎红松林和山杨红松林,轻、强度透光抚育下3种林型相近);各透光抚育强度对3者的土壤CH4年均通量(-0.047~-0.028 mg/(m^(2)·h))无显著影响,但白桦红松林和山杨红松林显著高于蒙古栎红松林;(2)轻、强度透光抚育对3种林型的植被年净固碳量(1.66~3.99 t/(hm^(2)·a))无显著影响,但在各透光抚育强度下白桦红松林显著高于蒙古栎红松林和山杨红松林(105.4%~124.1%和31.0%~32.6%),山杨红松林又显著高于蒙古栎红松林(55.7%~71.1%);(3)轻度透光抚育对蒙古栎红松林(-1.93~-1.12 t/(hm^(2)·a))、白桦红松林(-0.13~0.46 t/(hm^(2)·a))和山杨红松林(-1.03~-0.65 t/(hm^(2)·a))碳汇已无显著影响,而强度透光抚育的影响程度和方向与林型密切相关(蒙古栎红松林源强显著提高72.3%,白桦红松林由碳汇转化为弱源,山杨红松林源强变大但差异性不显著)。【结论】因此,从中期“栽针保阔”红松林维持森林碳汇方面考虑,对恢复较快的白桦红松林和山杨红�[Objective]This paper aims to reveal the influencing rule of forest type and light-felling intensity on the carbon source and sink of Korean pine forests by planting coniferous forest and reserving broadleaved forest(PCRBT),and to provide basis for the restoration of zonal climax vegetation broadleaved Korean pine forest.[Method]The annual net carbon sequestration of vegetation,net carbon emission(CH_(4),CO_(2))of soil heterotrophic respiration with related environmental factors(temperature,water content of soil,organic carbon,total nitrogen,etc.)under different light-felling intensities(control,low-intensity,heavyintensity)were measured simultaneously by static chamber-gas chromatograph and relative growth equation in three types of Korean pine forests by PCRB(Mongolian oak-Korean pine forest and white birch-Korean pine forest,and Korean pine was planted under secondary crown for 25−35 years and light-felling for 25−30 years)in temperate in Xiaoxing’an Mountains of northeastern China,in order to reveal the influence of forest type and light-felling intensity on the carbon source/sink of Korean pine forest according to the net carbon balance of ecosystem.[Result](1)The annual average efflux of soil CO_(2)(159.94−207.43 mg/(m^(2)·h))in three forest types was influenced by both the intensity of light-felling(heavy-intensity lightfelling significantly increased by 18.9%from Mongolian oak-Korean pine forest),and the forest type(control was white birch-Korean pine forest,which was significantly higher than aspen-Korean pine forest and Mongolian oak-Korean pine forest,low and heavy light-felling had no significant impacts among three forest types);low and heavy light-felling had no significant impacts on the annual average flux of soil CH_(4)uptake(−0.047−−0.028 mg/(m^(2)·h))from three forest types but white birch-Korean pine forest and aspen-Korean pine forest were significantly higher than Mongolian oak-Korean pine forest.(2)Low and heavyintensity light-felling made the annual net carbon sequestration

关 键 词：温带小兴安岭 “栽针保阔”红松林 碳源/汇 林型 透光抚育强度 

分 类 号：S750[农业科学—森林经理学] S791.247[农业科学—林学]