褐腐对白杨木材固碳量的影响规律及机理  

Effect and mechanism of brown rot on carbon sequestration of poplar wood

作　　者：徐华东[1] 狄亚楠 邢涛[1] 徐群 XU Huadong;DI Yanan;XING Tao;XU Qun(College of Engineering and Technology,Northeast Forestry University,Harbin 150040,Heilongjiang,China)

机构地区：[1]东北林业大学工程技术学院

出　　处：《中南林业科技大学学报》2019年第11期104-109,共6页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目”不同温度下时域反射法反演活立木树干含水率的机理及种特异性模型”（31870537）;中央高校基本科研业务费专项资金项目”活立木树干含水率时域反射反演机理及模型研究”（2572018BL08）;哈尔滨市应用技术研究与开发项目”便携式树木含水率检测仪的研制”（2017RAQXJ078）

摘　　要：研究腐朽对木材固碳量的影响规律,揭示固碳量变化的内在机理,可为木材固碳减排及木材防腐提供理论依据。当前关于腐朽对木材碳排放的影响鲜有报道,缺乏相应的量化数据。采用褐腐菌(密粘褶菌,G.t)对白杨木材试件进行为期90 d的生物腐朽试验与分析。腐朽培养期间,在不同培养周期(间隔15 d)取出试件并测定其固碳量与化学成分数值,分析腐朽时间对固碳量及各化学成分的影响,研究固碳量变化规律并基于各化学成分的变化探讨固碳量的变化机理。结果表明:1)随腐朽时间增加,绝对固碳量(固碳量实测值)不降反而小幅上升,相对固碳量(相对于腐朽前木材原始质量来说,单位质量木材含有的固碳量)显著下降,表明褐腐对木材固碳量变化具有显著影响(R^2=0.983,P <0.01);2)随腐朽时间增加,木材试样内木质素绝对含量和占比均小幅上升,综纤维素(包括α-纤维素和半纤维素)绝对含量和占比均明显下降。由于单位质量木质素含碳率64.08%大于综纤维素37.38%,导致木材内绝对固碳量产生了不降反升的现象。总之,褐腐过程中木质素比重变化是影响木材绝对固碳量变化的决定因素,质量损失率是影响木材相对固碳量变化的决定因素。该研究着眼于木材腐朽和木材固碳两个方面,系统分析了褐腐过程中随腐朽程度加深,白杨木材固碳量的变化规律和内在机理,为木材固碳减排及木材防腐积累了基础数据。The study of decay influence on wood carbon sequestration and revelation of the internal change mechanism of carbon sequestration are helpful to provide theoretical basis for wood carbon sequestration emission reduction and wood anticorrosion. Currently, there are few reports on wood decay effect on carbon emissions, and the corresponding quantitative data is also scarce. The brown rot fungus, Gloeophyllum trabeum, was used to infect the Populus alba wood specimens(20 mm×20 mm×30 mm) for 90 days. During the decay culture, the specimens were sampled every 15 days. And then the weight loss rate, carbon fixation and chemical compositions of both healthy wood and decayed wood were measured, and the effects of decay time on carbon fixation and chemical compositions were analyzed. Then based on the changes of each chemical composition, the mechanism of change in carbon fixation was elucidated. The results show that with the increase of decay time, the absolute carbon fixation, the measured value of carbon fixation, does not decrease but slightly rises, while the relative carbon fixation, the calculated value of carbon fixation which compared with the original weight before decay, is significantly decreased. Brown rot had a significant effect on the change of wood carbon fixation(R2=0.983, P < 0.01). With the increase of decay time, the absolute content of lignin in wood samples increased slightly, and the absolute content of holocellulose(including α-cellulose and hemicellulose) decreased significantly. This is because the carbon content of unit mass lignin, 64.08, is higher than that of hemicellulose, 37.38, the absolute content of carbon fixation in the unit mass of wood is increasing slightly instead of decreasing. Therefore, during the brown rot process, the proportion of lignin is the decisive factor that affects the change of absolute carbon fixation of wood. And the weight loss rate is the decisive factor affecting the change of relative carbon fixation of wood. This study focused on the two aspects, wood dec

关 键 词：木材 褐腐 质量损失率 固碳量 化学成分 

分 类 号：S781.81[农业科学—木材科学与技术]