scholarly journals Radial profile of sap flow velocity in mature Xinjiang poplar (Populus alba L. var. pyramidalis) in Northwest China

2014 ◽  
Vol 6 (5) ◽  
pp. 612-627 ◽  
Author(s):  
HongZhong Dang ◽  
TianShan Zha ◽  
JinSong Zhang ◽  
Wei Li ◽  
ShiZeng Liu
Keyword(s):  
Flow Velocity ◽  
Sap Flow ◽  
Radial Profile ◽  
Northwest China ◽  
Populus Alba ◽  
Sap Flow Velocity

scholarly journals Multiple Ceratocystis smalleyi Infections Associated with Reduced Stem Water Transport in Bitternut Hickory

2013 ◽  
Vol 103 (6) ◽  
pp. 565-574 ◽  
Author(s):  
J.-H. Park ◽  
J. Juzwik ◽  
J. Cavender-Bares
Keyword(s):  
Flow Velocity ◽  
Water Transport ◽  
Sap Flow ◽  
Vascular System ◽  
Field Studies ◽  
Growth Rings ◽  
North Central ◽  
The North ◽  
Stem Water ◽  
Sap Flow Velocity

Hundreds of cankers caused by Ceratocystis smalleyi are associated with hickory bark beetle-attacked bitternut hickory exhibiting rapid crown decline in the north-central and northeastern United States. Discolored sapwood colonized by the fungus commonly underlies the cankers. Field studies were conducted to test the hypothesis that C. smalleyi infections cause vascular system dysfunction in infected trees. Fifty C. smalleyi inoculations made at 1.8 to 3.8 m in height on stems of healthy bitternut hickory trees (13 to 28 cm in diameter at 1.4 m in height) resulted in extensive canker formation and sapwood discoloration 12 to 14 months after treatment compared with water-inoculated and noninoculated controls. Sap flow velocity (midday) was significantly lower in the infected trees compared with that in the controls. Sap flow velocity also was inversely correlated with the proportion of bark area with cankered tissues and with tylose abundance in the youngest two growth rings. Tylose formation in current-year vessels associated with C. smalleyi infections is likely responsible for much of the water transport disruption. It is hypothesized that multiple stem infections of C. smalleyi and the resulting xylem dysfunction contribute to crown wilt development in bitternut hickory exhibiting rapid crown decline.

Spatial variation in sap flow velocity in semiarid region trees: its impact on stand-scale transpiration estimates

2011 ◽  
Vol 26 (8) ◽  
pp. 1161-1168 ◽  
Author(s):  
Tomonori Kume ◽  
Kyoichi Otsuki ◽  
Sheng Du ◽  
Norikazu Yamanaka ◽  
Yi-Long Wang ◽  
...  
Keyword(s):  
Spatial Variation ◽  
Flow Velocity ◽  
Sap Flow ◽  
Semiarid Region ◽  
Sap Flow Velocity

Measurement of bleeding sap flow velocity in xylem bundle of herbs by laser probing

1991 ◽  
Author(s):  
Yuri A. Romanovsky ◽  
A. S. Stepanian ◽  
Yury H. Shogenov
Keyword(s):  
Flow Velocity ◽  
Sap Flow ◽  
Laser Probing ◽  
Sap Flow Velocity

Time Lag between Sap Flow and Climatic Factors in Arid Environments

2012 ◽  
Vol 518-523 ◽  
pp. 1647-1651
Author(s):  
Li He Yin ◽  
Guan Ccai Hou ◽  
Jin Ting Huang ◽  
Jia Qiu Dong ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Sap Flow ◽  
Climatic Factors ◽  
Time Lag ◽  
Study Time ◽  
Climatic Variables ◽  
Arid Environments ◽  
Net Radiation ◽  
Ordos Plateau ◽  
Sap Flow Velocity

Sap flow of trees was controlled by climatic variables and a time lag presents between them. In this study, Time lag between sap flow and climatic factors was analyzed for willow in the Ordos Plateau. The result shows that sap flow velocity lags behind net radiation about 110 minutes and there is almost no time lag between net radiation and sap flow velocity.

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