FN Archimer Export Format
PT J
TI Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
BT 
AF Verryckt, Lore T.
   Van Langenhove, Leandro
   Ciais, Philippe
   Courtois, Elodie A.
   Vicca, Sara
   Peñuelas, Josep
   Stahl, Clément
   Coste, Sabrina
   Ellsworth, David S.
   Posada, Juan M.
   Obersteiner, Michael
   Chave, Jérôme
   Janssens, Ivan A.
AS 1:1;2:1;3:2;4:3;5:1;6:4;7:5;8:5;9:6;10:7;11:8;12:9;13:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;
C1 Department of Biology University of Antwerp Wilrijk ,Belgium
   Laboratoire des Sciences du Climat et de l’Environnement CEA‐CNRS‐UVSQ Gif‐sur‐Yvette ,France
   Laboratoire Ecologie, Évolution, Interactions des Systèmes Amazoniens (LEEISA) Université de Guyane CNRS IFREMER Cayenne, French Guiana
   CSIC Global Ecology CREAF‐CEAB‐CSIC‐UAB Cerdanyola del Valles Barcelona, Spain
   UMR Ecofog, AgroParisTech, CNRS, Cirad INRA Université des Antilles Université de Guyane Kourou ,France
   Hawkesbury Institute for the Environment Western Sydney University Penrith NSW ,Australia
   Biology Department Faculty of Natural Sciences Universidad del Rosario Bogotá ,Colombia
   International Institute for Applied Systems Analysis (IIASA) Laxenburg, Austria
   UMR 5174 Laboratoire Evolution et Diversité Biologique Université Paul Sabatier CNRS Toulouse ,France
C2 UNIV ANTWERP, BELGIUM
   CEA, FRANCE
   UNIV GUYANE, FRANCE
   CSIC, SPAIN
   UNIV GUYANE, FRANCE
   UNIV SYDNEY, AUSTRALIA
   UNIV BOGOTA, COLOMBIA
   IIASA, AUSTRIA
   UNIV TOULOUSE, FRANCE
UM LEEISA
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 2.508
TC 13
UR https://archimer.ifremer.fr/doc/00613/72466/71949.pdf
LA English
DT Article
DE ;branch cutting;canopy physiology;French Guiana;gas exchange;photosynthesis;rainforest;stomatal conductance
AB Measuring leaf gas exchange from canopy leaves is fundamental for our understanding of photosynthesis and for a realistic representation of carbon uptake in vegetation models. Since canopy leaves are often difficult to reach, especially in tropical forests with emergent trees up to 60 m at remote places, canopy access techniques such as canopy cranes or towers have facilitated photosynthetic measurements. These structures are expensive and therefore not very common. As an alternative, branches are often cut to enable leaf gas exchange measurements. The effect of branch excision on leaf gas exchange rates should be minimized and quantified to evaluate possible bias. We compared light‐saturated leaf net photosynthetic rates measured on excised and intact branches. We selected branches positioned at three canopy positions, estimated relative to the top of the canopy: upper sunlit foliage, middle canopy foliage, and lower canopy foliage. We studied the variation of the effects of branch excision and transport among branches at these different heights in the canopy. After excision and transport, light‐saturated leaf net photosynthetic rates were close to zero for most leaves due to stomatal closure. However, when the branch had acclimated to its new environmental conditions—which took on average 20 min—light‐saturated leaf net photosynthetic rates did not significantly differ between the excised and intact branches. We therefore conclude that branch excision does not affect the measurement of light‐saturated leaf net photosynthesis, provided that the branch is recut under water and is allowed sufficient time to acclimate to its new environmental conditions. 
PY 2020
PD JUN
SO Biotropica
SN 0006-3606
PU Wiley
VL 52
IS 4
UT 000561189900001
BP 608
EP 615
DI 10.1111/btp.12774
ID 72466
ER

EF