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- Title
Seasonal variation of Cyclobalanopsis glauca whole-tree transpiration in karst region.
- Authors
Huang Yu-Qing; Zhang Zhong-Feng; He Cheng-Xin; Zhao Ping; Yuan Wei-Yuan; Jiao Ji-Fei; You Ye-Min
- Abstract
By using Granier's sap-flow method, the variations of sap flux density and whole-tree transpiration of Cyclobalanopsis glauca (syn. Quercus glauca) on a hilly slope in the karst region of South China were studied, with their driving factors analyzed. The sap flux density (Js) of C. glauca varied randomly with the diameter of breast height of individual trees, and its maximum occurred at 13:30 (KG-*2)-(KG-*7)14:30. In a seasonal course, the daily Js was the maximum (5600 g H2O·m -2·s-1) in summer, and the minimum (3586 g H2O·m-2·s-1) in spring. The daily whole-tree transpiration had a greater change with weather condition, representing a power functional relationship with vapor pressure deficit (VPD) and photosynthesically active radiation (PAR) (R=097,P<001). The average daily whole-tree transpiration tended to be high in summer and low in winter and spring, and decreased with the decrease of soil moisture content in autumn (drought season). However, comparing with that of the tree species in other regions, the daily whole-tree transpiration amount of C. glauca in study region was still higher, even though the weather was dry and the soil was thin. It was presumed that in the dry season in karst region, the water supply for C. glauca could be mainly depended on the water-rich epikarst.
- Subjects
CHINA; VAPOR pressure; SOIL moisture; PLANT growth; PLANT physiology; PLANT development; PLANT transpiration; PRECIPITATION variability; WEATHER
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2009, Vol 20, Issue 2, p256
- ISSN
1001-9332
- Publication type
Article