北京林业大学学报2013，Vol.35Issue(4)：21-26,6.
大兴安岭北部兴安落叶松树干液流规律及影响因子分析
Effects of influencing factors on stem sap flow in Larix gmelinii in northern Da Hinggan Mountains, northeastern China
摘要
Abstract
In this study,by Granier thermal dissipation probe (TDP) method,Larix gmelinii transpiration was continuously observed in northern Da Hinggan Mountains,northeastern China from May to September in 2012.Integrated with simultaneous environmental factors,transpiration of L.gmelinii and its relationship with influencing factors were investigated.The results showed that:1) L.gmelinii transpiration rate showed significant diurnal variations,which presented unimodal curves in sunny and cloudy days,and bimodal or multimodal curves in rainy days,respectively.Transpiration rates of sunny and cloudy days were higher than those of rainy days.The ratio list of night sap flow flux accounting for a full day's flow flux was:sunny day(5.91％) ＞ rainy day (4.88％) ＞ cloudy day(2.57％).In the case of high temperature and no rain,the sap flow presented a decreasing trend with the rainless and hot days increasing.2) Daily peak of L.gmelinii sap flow rate was high in June to August,and it reached the highest value of 23.6 cm3/(cm2 ·h) in July,the transpiration in June to August accounted for 80％ of the total water consumption during observation period.The daily peak in May was less and it got the lowest value of 2.03 cm3/(cm2 ·h) in September.3) Good correlation existed between sap flow rate and environmental factors,just as the coefficient of determination of their multiple regression model was 0.79.Further correlation analyses indicated that main environmental factors influencing sap flow density in the growing season were vapor pressure deficit and photosynthetic active radiation.4) The total transpiration of L.gmelinii stand during the growing season was 566.49 t/hm2,i.e.56.65 mm,accounted for 12％of rainfall in the same period.关键词
Granier热扩散法/兴安落叶松/树干液流/环境因子/林分蒸腾量Key words
Granier's thermal dissipation probe method/ Larix gmelinii/ stem sap flow/ environmental factors/ stand transpiration分类
农业科技引用本文复制引用
池波,蔡体久,满秀玲,李奕..大兴安岭北部兴安落叶松树干液流规律及影响因子分析[J].北京林业大学学报,2013,35(4):21-26,6.基金项目
林业公益性行业科研专项(201104005-05)、"东北林业大学学术名师支持计划"项目. （201104005-05）
