摘要
Using thermal dissipation probe(SF-G), a sample tree’s diurnal sap flow velocity and sap flow density at different trunk heights were monitored in the Quercus acutissima plantation in the Forestry Centre of Taishan Academy of Forestry Science in spring and autumn. 5 days data both in spring and autumn were selected, and spatial variation of trunk water pondage and sap flow was analyzed. In spring, the peak value was higher and fluctuated acutely, and the peak time appeared early and lasted longer than that in autumn. Sap flow velocity at upper trunk section was higher than that at mid and lower trunk section. In autumn, however, sap flow flux at the three trunk sections was very small and similar. Sap flow movement was lagged in order from the lower trunk to upper trunk by 60~120 min in autumn. Spring trunk poundage fluctuated sharply and extended greatly than that in autumn. The relative trunk water restoring time in spring was about 20 h, and 10~12 h longer than that in autumn.
Using thermal dissipation probe(SF-G), a sample tree's diurnal sap flow velocity and sap flow density at different trunk heights were monitored in the Quercus acutissima plantation in the Forestry Centre of Taishan Academy of Forestry Science in spring and autumn. 5 days data both in spring and autumn were selected, and spatial variation of trunk water pondage and sap flow was analyzed. In spring, the peak value was higher and fluctuated acutely, and the peak time appeared early and lasted longer than that in autumn. Sap flow velocity at upper trunk section was higher than that at mid and lower trunk Section. In autumn, however, sap flow flux at the three trunk sections was very small and similar. Sap flow movement was lagged in order from the lower trunk to upper trunk by 60 - 120 rain in autumn. Spring trunk poundage fluctuated sharply and extended greatly than that in autumn. The relative trunk water restoring time in spring was about 20 h, and 10 - 12 h longer than that in autumn.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2007年第4期115-120,共6页
Scientia Silvae Sinicae
基金
教育部博士点学科专项基金"北京市水源保护林区低耗水树种选择与林分结构配置的研究"
山东农业大学博士基金"山东省主要造林树种耗水特性与耗水调控机理的研究"资助
关键词
麻栎
边材液流速率
树干贮水量
Quercus acutissima
sap flow velocity
trunk poundage