空气温湿度对不同结构的红松松针床层含水率动态变化影响的室内模拟研究  被引量:5

Effects of indoor simulated air temperature and relative humidity on the moisture contents of the needle beds with different compactness of red pine

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作  者:张运林 孙萍[2] 刘方策 ZHANG Yunlin;SUN Ping;LIU Fangce(Guizhou Education University,School of Biological Sciences,Guiyang 550018,Guizhou,China;Northeast Forestry University,College of Forestry,Harbin 150040,Heilongjiang,China)

机构地区:[1]贵州师范学院生物科学学院,贵州贵阳550018 [2]东北林业大学林学院,黑龙江哈尔滨150040

出  处:《中南林业科技大学学报》2020年第10期18-27,93,共11页Journal of Central South University of Forestry & Technology

基  金:国家自然科学基金项目(31370656);贵州师范学院2019年度校级博士课题研究成果(2019BS005);贵州省教育厅青年科技人才成长项目(黔教合KY字[2016]213)。

摘  要:【目的】空气温度和相对湿度是对地表细小死可燃物含水率动态变化影响最显著的气象因子,对含水率预测模型中关键指标平衡含水率和时滞起重要作用,但由于对其研究的不全面性,至今温湿度对不同床层结构含水率的影响,特别是关键指标的影响还未达成共识。为了搞清空气温湿度对不同床层结构含水率动态变化和关键指标的影响。【方法】以红松地表细小死可燃物为研究对象,设置与自然状态接近的床层密实度梯度,置于恒温恒湿箱中,在不同温湿度配比下用自动称量天平记录含水率变化情况,分析密实度和温湿度对平衡含水率和时滞的影响,并建立相应的预测模型。【结果】不论温湿度和密实度如何改变,松针床层含水率呈指数下降;空气温度和相对湿度对平衡含水率有极显著影响,对于红松松针床层,Simard法预测平衡含水率效果要优于Nelson法,其误差均在可接受范围内;建立了形如τ=ae^(-bT)的不同密实度和湿度时的时滞预测模型,误差也在可接受范围内。【结论】揭示了不同温湿度条件下不同红松松针床层含水率动态变化过程,搞清其对平衡含水率和时滞的影响,对于可燃物含水率预测模型研究具有重要意义。【Objective】Air temperature and relative humidity are the most significant meteorological factors affecting the dynamic change of moisture content of surface fine dead fuel.They play an important role in the equilibrium moisture content and timelag of the key indicators in the moisture content prediction model.However,due to the incompleteness of its research,no consensus has been reached on the influence of temperature and humidity on moisture content of different bed structures,especially the influence of key indicators.In order to find out the influence of air temperature and humidity on dynamic change of moisture content and key index of different bed structure.【Method】The surface fine dead fuel of red pine,which have different compactness were constructed indoors.Placed in a constant temperature and humidity chamber,and the automatic weighting balance was recorded under different temperature and humidity.The effects of compactness,temperature and humidity on equilibrium moisture content and timelag were analyzed,and the corresponding prediction models are established.【Result】No matter how the temperature,humidity and compactness change,the moisture content of pine needle bed decreases exponentially.Air temperature and relative humidity have an extremely significant impact on the equilibrium moisture content.Simard method is better than Nelson method in predicting the equilibrium moisture content,and the error of Simard method is within the acceptable range.The timelag prediction model(τ=ae-bT)with different compactness and humidity is established,and the error is also within the acceptable range.【Conclusion】This research revealed the dynamic change process of moisture content in different pine needle beds under different temperature and humidity conditions,and figured out its influence on the equilibrium moisture content and timelag,which is of great significance for the study of fuel moisture content prediction model.

关 键 词:空气温度 相对湿度 密实度 地表细小死可燃物 

分 类 号:S762.2[农业科学—森林保护学]

 

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