应用生态学报2012，Vol.23Issue(5)：1159-1166,8.
鼎湖山针阔叶混交林优势种树干液流特征及其与环境因子的关系
Characteristics of dominant tree species stem sap flow and their relationships with environmental factors in a mixed conifer-broadleaf forest in Dinghushan, Guangdong Province of South China
摘要
Abstract
By the method of Granier' s thermal dissipation probe, the stem sap flow density of four dominant tree species (Pinus massoniana, Castanopsis chinensis, Schima superba, and Machilus kwangtungensis) in a mixed conifer-broadleaf forest in Dinghushan Reserve of South China was continuously measured in the dry season (November) and wet season (July) in 2010, and the environmental factors including air temperature, relative humidity, and photosynthetically active radiation ( PAR) were measured synchronically, aimed to study the characteristics of the stem sap flow of the tree species in response to environmental factors. During the dry and wet seasons, the diurnal changes of the stem sap flow velocity of the tree species all presented a typical single-peak curve, with high values in the daytime and low values in the nighttime. The average and maximum sap flow velocities and the daily sap flow flux of broad-leaved trees ( C. chinensis, S. superba, and M. kwangtungensis ) were significantly higher than those of coniferous tree ( P. massoniana) , and the maximum sap flow velocity of P. massoniana, C. valueschinensis, S. superba, and M. kwangtungensis was 29.48, 38.54, 51.67 and 58. 32 g H20 · m-1 · s-1 , respectively. A time lag was observed between the sap flow velocity and the diurnal variations of PAR, vapor pressure deficiency, and air temperature, and there existed significant positive correlations between the sap flow velocity and the three environmental factors. The PAR in wet season and the air temperature in dry season were the leading factors affecting the stem sap flow velocity of the dominant tree species.关键词
针阔叶混交林/树干液流/环境因子/干湿季/鼎湖山Key words
mixed conifer-broadleaf forest/ stem sap flow/ environmental factor/ dry and wet sea-sons/ Dinghushan.分类
农业科技引用本文复制引用
黄德卫,张德强,周国逸,刘世忠,Otieno Dennis,李跃林..鼎湖山针阔叶混交林优势种树干液流特征及其与环境因子的关系[J].应用生态学报,2012,23(5):1159-1166,8.基金项目
国家自然科学基金项目(31170375)、广东省自然科学基金团队项目(8351065005000001)、中国科学院外籍青年科学家计划项目(2009Y2AS5)和中国科学院知识创新工程重要方向项目(KZCX2-YW-GJ01)资助. （31170375）
