伏牛山三种天然林的树干茎流季节差异及胸径影响  

Seasonal Differences of Stemflow and Its Dependence upon DBH among Three Natural Forest Types in Funiu Mountain

作　　者：牛保亮 刘彦春[2] NIU Bao-liang;LIU Yan-chun(Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Ecology and Nature Conservation Institute,Chinese Academy of Forestry,Beijing 100091,China;School of Life Science,Henan University,Henan,Kaifeng 475004,China)

机构地区：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091 [2]河南大学生命科学学院,河南开封475004

出　　处：《林业科学研究》2024年第3期169-174,共6页Forest Research

基　　金：河南省科技厅科技攻关项目(222102320437);国家自然科学基金(31971454);河南省青年骨干教师培养计划(2020)。

摘　　要：[目的]探讨伏牛山三种森林类型的树干茎流差异及与林木胸径的关系,分析相同量级降雨的树干茎流季节差异。[方法]在伏牛山宝天曼地区选择三种典型天然林(华山松针叶林、锐齿栎阔叶林、华山松-鹅耳枥针阔混交林)的标准木,实测并收集树干茎流量后分析比较。[结果]生长季内的高降雨量事件(58.2 mm)导致的树干茎流体积与林木胸径呈正相关,然而在低降雨量事件(10.8 mm)下二者呈负相关。在单次降雨量相同或相近条件下,冬季的树干茎流体积(17 770~35 590 mL)和茎流率(0.106)显著高于春、夏和秋季,而树干茎流体积在前三个季节之间并无显著差异,针阔混交林在秋季和冬季的茎流率更高,这主要归因于冬季落叶阔叶树的林冠叶片截持作用消失。相比针叶林和阔叶林,针阔混交林的林分密度更高且胸径更小,导致其林分树干茎流量最高。[结论]不同森林类型的树干茎流量因降雨量和林木胸径大小而异,林木胸径和叶片形态是决定树干茎流季节差异的重要因素。[Objective]The aim of this study is to determine the differences of stemflow between different forest types and its relationships with diameter at breast height(DBH),and analyze the seasonal vari-ations in stemflow between forest types under the same rainfall levels.[Method]Field measurement in-cluding standard tree selection and stemflow collection was conducted in three typical forest types located at Baotianman of Funiu Mountain.[Result]During the growing season,stemflow volume was positively correlated with DBH under high-level rainfall,but negatively related to DBH under low-level rainfall.Stem-flow volume(17770~35590 mL)and stemflow rate(0.106)were greater in winter than spring,summer and autumn under the same rainfall level.There were no differences in stemflow volume among three earlier seasons.Higher stemflow rate was found for conifers-broadleaf mixed forest in autumn and winter,which could be explained by the weakened interception of leaf at canopy in winter.The results showed that mixed coniferous-broadleaf forest had greater stemflow than that of coniferous and broadleaf forest mainly due to its higher stand density and lower DBH.[Conclusion]The finding that differential stemflow among forest types associated with rainfall levels and DBH values indicates that DBH and leaf property are critical to determine the seasonal variation in stemflow.

关 键 词：树干茎流 伏牛山 胸径 季节变异 

分 类 号：S718.5[农业科学—林学]