PMID- 28549168
OWN - NLM
STAT- MEDLINE
DCOM- 20180119
LR  - 20181202
IS  - 1758-4469 (Electronic)
IS  - 0829-318X (Linking)
VI  - 37
IP  - 7
DP  - 2017 Jul 1
TI  - Assessing the thermal dissipation sap flux density method for monitoring cold 
      season water transport in seasonally snow-covered forests.
PG  - 984-995
LID - 10.1093/treephys/tpx049 [doi]
AB  - Productivity of conifers in seasonally snow-covered forests is high before and 
      during snowmelt when environmental conditions are optimal for photosynthesis. 
      Climate change is altering the timing of spring in many locations, and changes in 
      the date of transition from winter dormancy can have large impacts on annual 
      productivity. Sap flow methods provide a promising approach to monitor tree 
      activity during the cold season and the winter-spring and fall-winter 
      transitions. Although sap flow techniques have been widely used, cold season 
      results are generally not reported. Here we examine the feasibility of using the 
      Granier thermal dissipation (TD) sap flux density method to monitor transpiration 
      and dormancy of evergreen conifers during the cold season. We conducted a 
      laboratory experiment which demonstrated that the TD method reliably detects 
      xylem water transport (when it occurs) both at near freezing temperature and at 
      low flow rate, and that the sensors can withstand repeated freeze-thaw events. 
      However, the dependence between sensor output and water transport rate in these 
      experiments differed from the established TD relation. In field experiments, 
      sensors installed in two Abies forests lasted through two winters and a summer 
      with low failure. The baseline (no-flow) sensor output varied considerably with 
      temperature during the cold season, and a new baseline algorithm was developed to 
      accommodate this variation. The Abies forests differed in elevation (2070 and 
      2620 m), and there was a clear difference in timing of initiation and cessation 
      of transpiration between them. We conclude that the TD method can be reliably 
      used to examine water transport during cold periods with associated low flow 
      conditions.
CI  - (c) The Author 2017. Published by Oxford University Press. All rights reserved. For 
      Permissions, please email: journals.permissions@oup.com.
FAU - Chan, Allison M
AU  - Chan AM
AD  - Department of Biology, University of Utah, 257 South 1400 East, Salt Lake City, 
      UT 84112, USA.
AD  - Los Alamos National Laboratory, Environmental Management Division, Los Alamos, NM 
      87545, USA.
FAU - Bowling, David R
AU  - Bowling DR
AD  - Department of Biology, University of Utah, 257 South 1400 East, Salt Lake City, 
      UT 84112, USA.
LA  - eng
PT  - Journal Article
PL  - Canada
TA  - Tree Physiol
JT  - Tree physiology
JID - 100955338
RN  - 059QF0KO0R (Water)
SB  - IM
MH  - Abies/*physiology
MH  - Climate Change
MH  - *Cold Temperature
MH  - *Forests
MH  - Plant Transpiration
MH  - *Seasons
MH  - *Snow
MH  - Trees/physiology
MH  - Water
MH  - Xylem/physiology
OTO - NOTNLM
OT  - conifer
OT  - dormancy
OT  - freeze-thaw
OT  - sap flow
OT  - winter
EDAT- 2017/05/27 06:00
MHDA- 2018/01/20 06:00
CRDT- 2017/05/27 06:00
PHST- 2016/09/01 00:00 [received]
PHST- 2017/05/03 00:00 [accepted]
PHST- 2017/05/27 06:00 [pubmed]
PHST- 2018/01/20 06:00 [medline]
PHST- 2017/05/27 06:00 [entrez]
AID - 3855093 [pii]
AID - 10.1093/treephys/tpx049 [doi]
PST - ppublish
SO  - Tree Physiol. 2017 Jul 1;37(7):984-995. doi: 10.1093/treephys/tpx049.