江西农业大学学报2013，Vol.35Issue(3)：462-467,6.
干热河谷主要造林树种生长季树干液流的时滞特征
Time Lag Characteristics of Stem Sap Flow of Main Afforestation Tree Species during Their Growth Season in Yuanmou Dry-hot Valley of Southwest China
摘要
Abstract
The method of thermal dissipation probes (TDP) was applied to measure the sap flow of the main afforestation tree species,such as Albizzia kalkora,Azadirachta indica,Acacia auriculaeformis,Leucaena leucocephala,Eucalyptus camaldulensis and Acacia confusa,during their growth season in Yunmou dry-hot valley.Meteorological factors such as photosynthetic active radiation (PAR),air temperature (T),relative humidity (RH),water vapor pressure deficit (VPD) and wind speed (WS)were measured at the same time.Cross-correlation analysis was used to estimate the time lag between the stem sap flow and the driving factors of canopy transpiration among the tree species.The results indicated:(1) The stem sap flow of the six tree species was significantly correlated with the radiation (PAR) and vapor pressure deficit (D),and the stem sap flow lagged behind PAR but ahead of D.(2)There was a small difference among the time lags of the six tree species.And the diurnal sap flow was more dependent on PAR than on D.(3) The time lag between the stem sap flow and PAR/D was not correlated with the tree features,such as DBH,tree heigh,canopy area,sapwood area and the nocturnal water recharge.关键词
干热河谷/树干液流/热扩散法/时滞Key words
dry-hot valley / sap flow / TDP/ time lag分类
农业科技引用本文复制引用
王小菲,孙永玉,李昆,张春华,李彬,侯锐..干热河谷主要造林树种生长季树干液流的时滞特征[J].江西农业大学学报,2013,35(3):462-467,6.基金项目
国家"十二五"科技支撑计划专项(2011BAD38B0105) （2011BAD38B0105）
