鼎湖山过渡性针阔混交林主要树种树干液流与水分利用特征  

Sap flow and water use characteristics of dominant tree species in the transitional conifer⁃broadleaf mixed forest of Dinghushan Mountain

作　　者：黄婉萱 罗璇 成仙利[1,4] 杨萌萌 孟泽 李跃林[1,2] HUANG Wanxuan;LUO Xuan;CHENG Xianli;YANG Mengmeng;MENG Ze;LI Yuelin(South China Botanical Garden,Chinese Academic of Sciences,Guangzhou 510650,China;University of Chinese Academy of Sciences,Beijing 100049,China;Central South University of Forestry and Technology,Changsha 410004,China;Hubei University,Wuhan 430062,China)

机构地区：[1]中国科学院华南植物园,广州510650 [2]中国科学院大学,北京100049 [3]中南林业科技大学,长沙410004 [4]湖北大学,武汉430062

出　　处：《生态学报》2025年第7期3341-3352,共12页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(31961143023)。

摘　　要：采用Granier热扩散探针法(Thermal Dissipation Probes, TDP),对中国南亚热带地区鼎湖山的过渡性针阔混交林中的主要树种——木荷(Schima superba)、马尾松(Pinus massoniana)和锥(Castanopsis chinensis)的树干液流变化进行了监测,并结合相对湿度、大气温度、光合有效辐射、太阳总辐射、降水量等环境因子进行了综合分析。研究发现,树干液流日变化特征表现为昼高夜低的单峰或双峰曲线,中午时液流密度达到峰值。具体而言,木荷液流密度的最高峰值为42.08 g m^(-2)s^(-1),马尾松为39.10 g m^(-2)s^(-1),锥为43.98 g m^(-2)s^(-1)。不同树种的液流密度存在差异,平均液流密度的大小关系为:锥>木荷>马尾松。此外,同一树种的不同个体之间也存在液流密度的差异。不同树种对各环境因子的响应程度不同,但整体而言,太阳辐射对液流速率的影响最大。揭示了鼎湖山过渡性针阔混交林中不同树种的水分利用特征及其与环境因素的关系,为过渡性针阔叶混交林的研究提供了新的见解。Evergreen broad⁃leaved forest is a typical vegetation type in subtropical China,with a complex ecosystem structure and important ecological functions and economic value.Coniferous and broad⁃leaved mixed forests play a significant role in subtropical evergreen broad⁃leaved forest ecosystems,contributing crucially to water and soil conservation and providing essential economic resources such as timber,medicinal herbs,and edible fungi.Conducting in⁃depth research on the water use characteristics of different tree species within these mixed forests is essential for enriching and advancing the understanding of subtropical evergreen broad⁃leaved forests.And vegetation transpiration is a key process in the water cycle of forest ecosystems,reflecting the water use characteristics of vegetation.Therefore,the determination of sap flow rate in tree stems is of great significance for the study of hydrological characteristics in a certain area.This study employed the Granier thermal dissipation probe method(Thermal Dissipation Probes,TDP)to monitor the variations in stem sap flow of dominant tree species—Schima superba,Pinus massoniana,and Castanopsis chinensis—within the transitional conifer⁃broadleaf mixed forest of Dinghushan Mountain in the southern subtropical region of China.The investigation included a comprehensive analysis of environmental factors such as relative humidity,atmospheric temperature,photosynthetically active radiation,total solar radiation,and precipitation.The main scientific questions explored are:1.Are there any differences in stem sap flow rate,daily variation,and seasonal variation among different dominant tree species?2.How do these differences vary with altitude?3.What climatic factors have a critical impact on the sap flow rate of tree stems?Lastly,the results indicated that the diurnal patterns of stem sap flow showed either unimodal or bimodal curves,with higher flow rates during the day and lower rates at night,peaking around noon.Specifically,the peak sap flow density values

关 键 词：树干液流 水分利用特征 过渡性针阔混交林 

分 类 号：S718.5[农业科学—林学]