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Eff ects of thinning on ecosystem carbon storage and tree-shrub-herb diversity of a low-quality secondary forest in NE China

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Journal of Forestry Research 2023年第4期34卷 977-991页

作者： Baoshan Zhang xibin dong Hangfeng Qu Ran Gao Liangliang Mao Key Laboratory of Sustainable Forest Management and Environmental Microorganism Engineering of Heilongjiang Province Northeast Forestry UniversityHarbin 150040People’s Republic of China

Thinning is a widely used forest management tool but systematic research has not been carried out to verify its eff ects on carbon storage and plant diversity at the ecosystem *** this study,the eff ect of thinning was assessed across seven thinning intensities(0,10,15,20,25,30 and 35%)in a low-quality secondary forest in NE China over a ten-year *** aff ected the carbon storage of trees,and shrub,herb,and soil layers(P<0.05).It fi rst increased and then decreased as thinning intensity increased,reaching its maximum at 30%*** storage of the soil accounted for more than 64%of the total carbon stored in the *** was highest in the upper 20-cm soil *** increased tree species diversity while decreasing shrub and herb diversities(P<0.05).Redundancy analysis and a correlation heat map showed that carbon storage of tree and shrub layers was positively correlated with tree diversity but negatively with herb diversity,indicating that the increase in tree diversity increased the carbon storage of natural forest *** thinning decreased shrub and herb diversities,it increased the carbon storage of the overall ecosystem and tree species diversity of secondary *** carbon storage and the highest tree diversity were observed at a thinning intensity of 30%.This study provides evidence for the ecological management of natural and secondary forests and improvement of ecosystem carbon sinks and biodiversity.

关键词： Thinning Carbon storage Plant diversity Forest management NE China

A novel model to evaluate spatial structure in thinned conifer-broadleaved mixed natural forests

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Journal of Forestry Research 2023年第6期34卷 1881-1898页

作者： Hui Liu xibin dong Yuan Meng Tong Gao Liangliang Mao Ran Gao Key Laboratory of Sustainable Forest Management and Environmental Microorganism Engineering of Heilongjiang Province Northeast Forestry UniversityHarbin 150040People’s Republic of China

In order to ensure the effective analysis and reconstruction of forests,it is key to ensure the quantitative description of their spatial *** this paper,a distance model for the optimal stand spatial structure based on weighted Voronoi diagrams is *** particular,we provide a novel methodological model for the comprehensive evaluation of the spatial structure of forest stands in natural mixed conifer-broadleaved forests and the formulation of management decision *** applicability of the rank evaluation and the optimal solution distance model are compared and assessed for different standard sample plots of natural mixed conifer-broadleaved *** effect of crown width on the spatial structure unit of the trees is observed to be higher than that of the diameter at breast ***,the influence of crown length is greater than that of tree *** are nine possible spatial structure units determined by the weighted Voronoi diagram for the number of neighboring trees in the central tree,with an average intersection of neighboring crowns reaching 80%.The rank rating of natural forest sample plots is correlated with the optimal solution distance model,and their results are generally consistent for natural ***,the rank rating is not able to provide a quantitative *** optimal solution distance model is observed to be more comprehensive than traditional methods for the evaluation of the spatial structure of forest *** can effectively reflect the trends in realistic stand spatial structure factors close to or far from the ideal structure point,and accurately assesses the forest spatial *** proposed optimal solution distance model improves the integrated evaluation of the spatial structure of forest stands and provides solid theoretical and technical support for sustainable forest management.

关键词： Weighted Voronoi diagram Optimal distance model Spatial structure quantifi cation Thinning intensity Conifer-broadleaved mixed natural forests

Thinning intensity aff ects carbon sequestration and release in seasonal freeze–thaw areas

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Journal of Forestry Research 2023年第4期34卷 993-1006页

作者： Tong Gao Xinyu Song Yunze Ren Hui Liu Hangfeng Qu xibin dong Key Laboratory of Sustainable Forest Management and Environmental Microorganism Engineering of Heilongjiang Province Northeast Forestry UniversityHarbin 150040People’s Republic of China

To explore how to respond to seasonal freeze–thaw cycles on forest ecosystems in the context of climate change through thinning,we assessed the potential impact of thinning intensity on carbon cycle *** varying the number of temperature cycles,the eff ects of various thinning intensities in four *** rate of mass,litter organic carbon,and soil organic carbon(SOC)loss in response to temperature variations was examined in two degrees of *** unfrozen season had the highest decomposition rate of litter,followed by the frozen ***-decomposed litter had a higher decomposition rate than undecomposed *** decomposition rate of litter was the highest when the thinning intensity was 10%,while the litter and SOC were *** litter had a good carbon sequestration impact in the unfrozen and freeze–thaw seasons,while the converse was confi rmed in the frozen and thaw *** best carbon sequestration impact was identifi ed in litter,and soil layers under a 20–25%thinning intensity,and the infl uence of undecomposed litter on SOC was more noticeable than that of semi-decomposed *** litter and soil can store carbon:however,carbon is transported from undecomposed litter to semi-decomposed litter and to the soil over *** summary,the best thinning intensity being 20–25%.

关键词： Forest carbon cycle Seasonal freeze–thaw Thinning Climate change

Effect of thinning intensity on the carbon sequestration of natural mixed coniferous and broadleaf forests in Xiaoxing'an Mountains, China

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Journal of Forestry Research 2024年第6期35卷 198-209页

作者： Hangfeng Qu xibin dong Hui Liu Baoshan Zhang Tong Gao Yuan Meng Yunze Ren Ying Zhang Key Laboratory of Sustainable Forest Management and Environmental Microorganism Engineering of Heilongjiang Province Northeast Forestry UniversityHarbin 150040People’s Republic of China Harbin Forestry Machinery Research Institute State Forestry and Grassland AdministrationHarbin 150086People’s Republic of China

To study the effect of thinning intensity on the carbon sequestration by natural mixed coniferous and broad-leaf forests in Xiaoxing’an Mountains,China,we established six 100 m×100 m experimental plots in dongfanghong For-est that varied in thinning intensity:plot A(10%),B(15%),C(20%),D(25%),E(30%),F(35%),and the control sample area(0%).A principal component analysis was performed using 50 different variables,including species diversity,soil fertility,litter characteristics,canopy structure param-eters,and seedling regeneration *** effects of thinning intensity on carbon sequestration were strongest in plot E(0.75),followed by D(0.63),F(0.50),C(0.48),B(0.22),A(0.11),and the control(0.06).The composite score of plot E was the highest,indicating that the carbon sequestration effect was strongest at a thinning intensity of 30%.These findings provide useful insights that could aid the management of natural mixed coniferous and broadleaf forests in Xiaoxing’an Mountains,*** information has implications for future studies of these forests,and the methods used could aid future ecological assessments of the natural forests in Xiaoxing’an Mountains,China.

关键词： Thinning intensity Xiaoxing’an Mountains China Natural mixed coniferous and broadleaf forest Carbon sequestration

间伐强度对落叶松次生林冠层结构和林内光环境的影响

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北京林业大学学报 2018年第10期40卷 13-23页

作者：管惠文董希斌东北林业大学工程技术学院黑龙江哈尔滨150040

【目的】为改善林分结构和促进林木生长,对大兴安岭落叶松次生林进行不同强度的抚育间伐,研究落叶松冠层结构和光合特性指标的相关关系,进而探讨改善林内光环境特征的最佳间伐强度。【方法】设置间伐强度为9.43%、16.75%、29.00%、40.01... 详细信息

【目的】为改善林分结构和促进林木生长,对大兴安岭落叶松次生林进行不同强度的抚育间伐,研究落叶松冠层结构和光合特性指标的相关关系,进而探讨改善林内光环境特征的最佳间伐强度。【方法】设置间伐强度为9.43%、16.75%、29.00%、40.01%、53.09%、67.25%的实验样地和未进行间伐作业的对照样地。对不同样地落叶松冠层结构参数和光合特征参数指标值间的差异进行描述性统计,运用相关系数法确定不同指标间的相关关系进而剔除有显著正相关的部分指标,同时运用灰色关联法对各个样地的光环境特征进行综合评价。其中冠层结构选取林隙分数、开度、叶面积指数、叶倾角、直接定点因子、间接定点因子、总定点因子、冠上直接辐射、冠上间接辐射、冠上总辐射、冠下直接辐射、冠下间接辐射、冠下总辐射13项指标,光合特征参数选取蒸腾速率、光合速率、CO2参考值、叶片表面P.A.R、叶片温度、胞间CO2浓度、水蒸气气孔导度7项指标。【结果】各样地林隙分数表现为随间伐强度的增加先减少后增加,开度、直接定点因子、总定点因子与之变化趋势相同,各项指标值均在间伐强度为29.00%的样地中最小;叶面积指数在间伐强度为29.00%时达到最大值;不同间伐强度样地的冠上辐射通量无显著差异性;冠下直接辐射通量和冠下总辐射通量随间伐强度的增加先减少后增加。随着间伐强度的增加,落叶松的蒸腾速率、光合速率、水蒸气气孔导度均呈现先增加后减少的趋势,叶片表面P.A.R、叶片温度先增加后趋于稳定,间伐增加了林地内的CO2浓度;胞间CO2浓度随着间伐强度的增加先减小再增加后减小。林隙分数与开度、直接定点因子、总定点因子、冠下直接辐射、冠下总辐射呈显著正相关,与叶面积指数呈显著负相关;蒸腾速率、光合速率、水蒸气气孔导度之间呈显著正相关性。剔除相关性极强的指标后,冠层结构的林隙分数与光合速率呈显著负相关,叶面积指数与光合速率呈显著正相关。运用灰色关联综合评判林地内的光环境特征,关联度表现为间伐强度29.00%(0.823)>40.01%(0.794)>53.09%(0.739)>0%(0.724)>67.25%(0.713)>16.75%(0.701)>9.43%(0.673)。【结论】落叶松冠层结构与光合特征指标间存在相关性,落叶松冠层的透光率对于光合速率有明显的影响。结合二者综合评价不同间伐强度下的林地光环境特征,抚育间伐强度为29.00%、40.01%的落叶松天然次生林林地的林内光环境特征较好,说明29.00%~40.01%的中等强度间伐有利于林内光环境的改善。

关键词：间伐强度落叶松次生林冠层结构参数光合参数灰色关联评价

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木材转运设备虚拟设计与运动仿真

森林工程 2021年第1期37卷 59-65页

作者：王跃董希斌森林持续经营与环境微生物工程黑龙江省重点实验室(东北林业大学) 哈尔滨150040

为实现中国通商口岸木材的自动化搬运,本文设计一款专用于木材转运的机械设备。采用Creo5.0中的Parametric模块对木材转运设备的各个机构和零件进行三维建模,主要包括龙门架主体框架结构、夹持机构和运载火车底盘(轨距为1435 mm和1520 ... 详细信息

为实现中国通商口岸木材的自动化搬运,本文设计一款专用于木材转运的机械设备。采用Creo5.0中的Parametric模块对木材转运设备的各个机构和零件进行三维建模,主要包括龙门架主体框架结构、夹持机构和运载火车底盘(轨距为1435 mm和1520 mm)。根据运动方式的不同,采用不同的连接方式对各个机构进行装配,在夹持机构夹片末端内侧添加一个观测点,并对装配模型进行运动仿真分析。仿真结果表明,木材转运设备的各个机构能够协调工作,解决了各个零件之间的装配方式与运动合理性问题;对木材转运设备的三维模型进行优化,以提高木材转运的效率,使设计方案更加完善,为木材转运设备的后续研究与优化奠定基础。

关键词：木材转运龙门架夹持机构虚拟设计运动仿真

大兴安岭5种类型低质林土壤呼吸日变化及影响因素

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东北林业大学学报 2014年第9期42卷 77-82页

作者：宋启亮董希斌东北林业大学哈尔滨150040

以大兴安岭地区针阔混交低质林、山杨低质林、蒙古栎低质林、白桦低质林、阔叶混交低质林为研究对象,采用LI-8150多通道土壤呼吸自动测量系统测定了不同类型低质林土壤呼吸速率的日变化,并测定了观测点的土壤温度、湿度、理化性质以及... 详细信息

以大兴安岭地区针阔混交低质林、山杨低质林、蒙古栎低质林、白桦低质林、阔叶混交低质林为研究对象,采用LI-8150多通道土壤呼吸自动测量系统测定了不同类型低质林土壤呼吸速率的日变化,并测定了观测点的土壤温度、湿度、理化性质以及枯落物。结果表明：不同类型低质林土壤呼吸速率差异显著,土壤呼吸速率白天均高于夜晚,1 d中最高值出现在12：00—14：00,最低值出现在23：00—03：00,土壤呼吸速率与土壤温度的关系适合指数模型（R2为0.73~0.82）,土壤呼吸速率与土壤温度和土壤湿度呈显著的二次曲线关系（R2为0.61~0.85）,土壤温湿度双因子复合模型能更好解释不同类型低质林土壤呼吸速率的差异。土壤呼吸速率与土壤总孔隙度、有机质质量分数存在显著的正相关性,与土壤pH值、氮质量分数及半分解枯落物蓄积量相关性也较高。

关键词：大兴安岭低质林土壤呼吸日变化土壤温度土壤湿度

大兴安岭不同类型低质林群落稳定性的综合评价

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林业科学 2014年第6期50卷 10-17页

作者：宋启亮董希斌东北林业大学森林持续经营与环境微生物工程黑龙江省重点实验室哈尔滨150040

以大兴安岭林区分布的针阔混交林、山杨林、蒙古栎林、白桦林和阔叶混交林5种典型低质林森林群落类型为研究对象,选择反映森林群落基本特征的物种多样性、土壤物理性质、土壤化学性质、枯落物特性和土壤碳通量这5项指标,共30个评价因子... 详细信息

以大兴安岭林区分布的针阔混交林、山杨林、蒙古栎林、白桦林和阔叶混交林5种典型低质林森林群落类型为研究对象,选择反映森林群落基本特征的物种多样性、土壤物理性质、土壤化学性质、枯落物特性和土壤碳通量这5项指标,共30个评价因子,运用模糊数学中隶属函数的方法综合评价低质林森林群落稳定性。结果表明:针阔混交林物种多样性、枯落物特性、土壤碳通量指标最高,阔叶混交林土壤化学性质指标最高,蒙古栎林土壤物理性质指标最高,大兴安岭5种森林群落稳定性表现为针阔混交林>阔叶混交林>蒙古栎林>白桦林>山杨林。评价结果可以为当地低质林生态系统恢复提供理论依据。

关键词：大兴安岭低质林森林群落稳定性

抚育间伐强度对兴安落叶松林初冬时期土壤呼吸及理化性质的影响

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东北林业大学学报 2020年第6期48卷 146-151页

作者：陈蕾董希斌森林持续经营与环境微生物工程黑龙江省重点实验室(东北林业大学) 哈尔滨150040

以大兴安岭地区兴安落叶松林为研究对象,探讨初冬时期不同强度的抚育间伐对土壤呼吸及理化性质的影响。运用LI-8150多通道土壤碳通量测量仪对土壤呼吸相关指标进行测定,选取0~20 cm的土壤样本进行理化性质测定。运用主成分分析法分析抚... 详细信息

以大兴安岭地区兴安落叶松林为研究对象,探讨初冬时期不同强度的抚育间伐对土壤呼吸及理化性质的影响。运用LI-8150多通道土壤碳通量测量仪对土壤呼吸相关指标进行测定,选取0~20 cm的土壤样本进行理化性质测定。运用主成分分析法分析抚育间伐后土壤呼吸及土壤理化性质变化规律。结果表明:(1)土壤呼吸最大值一般出现在14:00-18:00,最小值出现在04:00-06:00。当抚育间伐强度为13.7%时,土壤呼吸速率最高(0.853μmol·m^-2·s^-1)。土壤呼吸速率与土壤温度有较为显著的正相关关系(R^2为0.426~0.668),与土壤湿度呈正相关关系(R2为0.325~0.503)。(2)土壤呼吸速率与总孔隙度(0.543)、最大持水量(0.464)呈正相关关系,与速效P(-0.549)、全P(-0.437)、土壤密度(-0.400)呈负相关关系。(3)运用主成分分析法建立不同抚育间伐强度样地评价模型,综合评价得出,当抚育间伐强度为25.5%时,样地得分最高,改造效果最佳。适宜的林分生长环境,林分密度适中,林分结构得到改善,土壤中营养物质提高,也使得土壤呼吸速率加快。其结果为大兴安岭林区的森林经营的管理与可持续发展提供理论依据。

关键词：抚育间伐强度土壤呼吸落叶松理化性质主成分分析