Diurnal, daily, seasonal and annual patterns of sap-flux-scaled transpiration from an Acacia mangium plantation in South China
Diurnal, daily, seasonal and annual patterns of sap-flux-scaled transpiration from an Acacia mangium plantation in South China
复制标题
华南马占相思人工林液流尺度蒸腾的日、日、季节和年模式
DOI：
10.1051/forest:2008013
复制
发表时间：
2008-06-01
影响因子：
3
通讯作者：
Zeng, Xiao-ping
中科院分区：
文献类型：
--
作者：
Ma, Ling;Lu, Ping;Zeng, Xiao-ping
In this study of a 19-year-old Acacia mangium plantation with a basal area of 26.6 m(2) ha(-1) in subtropical South China, whole tree sap flow was measured continuously over a two-year period and the dependence of stand sap flow (Et) on environmental factors was investigated at diurnal (hourly), daily, seasonal and annual scales.Daytime hourly mean Et was linearly correlated to photosynthetically active radiation (Q) and vapor pressure deficit (D) in each season during the whole study period (R-2 > 0.57, P < 0.001), whereas daily daytime mean Et was less tightly coupled to Q and D (R-2 < 0.50).Pronounced hysteresis was observed between Et and Q as well as D and the extent of the hysteresis varied seasonally.Total annual stand transpiration was higher in the first year (244.5 mm) than in the second year (185.8 mm) although rainfall was lower in the first year (1 122.4 mm) than in the second year (1 342.5 mm), from which it can be concluded that annual stand transpiration did not simply increase with increased annual rainfall.
