大兴安岭森林凋落物含水率的季节动态与预测  

Seasonal Dynamics and Prediction of Forest Litter Moisture in Daxing'anling Region

作　　者：张恒[1] 金森[1] 邸雪颖[1] 

机构地区：[1]东北林业大学林学院,黑龙江哈尔滨150040

出　　处：《林业科学研究》2014年第5期683-688,共6页Forest Research

基　　金：林业公益性行业科研专项(201204508)资助

摘　　要：通过对2010年春、2010年和2011年两个秋季大兴安岭地区盘古林场樟子松、兴安落叶松、白桦林分下凋落物含水率的连续观测,研究了其含水率的季节动态变化特征及其与气象因子的关系。结果表明:凋落物含水率与湿度和降水有着密切的关系,特别是和前两天的空气相对湿度和降水量关系最密切,呈现明显的滞后现象,而与温度和风速的关系不密切。春季3种林分凋落物含水率与空气相对湿度具有指数性的关系,与前两日降水量呈现具有渐近线的函数关系;秋季的含水率与两者都呈线性的关系,具有一定的滞后性。本文所揭示的可燃物含水率与湿度和降水的非线性关系形式与现有的一些研究和常用的简单线性回归方程不同,采用非线性形式的春季含水率预测模型要比线性模型精度高,这将有助于改进气象要素回归法预测可燃物含水率的准确性以及提高火险预报的针对性。The dynamics of litter moisture under Scots pine, anling Region, Heilongjiang Province, were observed in the larch and birch stands in Pahgu Forest Farm, Daxing spring of 2010 and the autumns of 2010 and 2011. The responses of the litter moisture to weather variables were analyzed. The results showed that the litter moistures of the three stands were closely related to the relative humidity and rainfall, particularly to the humidity and rainfall two days ago, showing a obviously lagging but not related to the air temperature and wind velocity. The litter moistures under the three stands in spring showed an exponential relationship with the air humidity and an asymptotic relation- ship with rainfall while those for autumn were both linear. The prediction models established in nonlinear form using spring data are more accurate than those of linear form. These relationships are different from those commonly used in current fuel moisture prediction models and could be beneficial for improving the modeling accuracy in the future.

关 键 词：大兴安岭 可燃物含水率 降水 季节 气象 

分 类 号：S762.2[农业科学—森林保护学]