Seasonal variability of leaf area index and foliar nitrogen in contrasting dry-mesic tundras
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Seasonal variability of leaf area index and foliar nitrogen in contrasting dry-mesic tundras. / Campioli, Matteo; Michelsen, Anders; Lemeur, Raoul; Samson, Roeland.
I: Botany, Bind 87, Nr. 5, 2009, s. 431-442.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Seasonal variability of leaf area index and foliar nitrogen in contrasting dry-mesic tundras
AU - Campioli, Matteo
AU - Michelsen, Anders
AU - Lemeur, Raoul
AU - Samson, Roeland
N1 - Key words: leaf traits, leaf area index, foliar nitrogen, seasonal canopy dynamics, northern heath, ecosystem C cycle.
PY - 2009
Y1 - 2009
N2 - Assimilation and exchange of carbon for arctic ecosystems depend strongly on leaf area index (LAI) and total foliar nitrogen (TFN). For dry-mesic tundras, the seasonality of these characteristics is unexplored. We addressed this knowledge gap by measuring variations of LAI and TFN at five contrasting subarctic heaths during the growing season 2007, from about 2 weeks after bud burst until about 2 weeks before senescence. The communities generally showed an early season LAI and TFN increase, owing to leaf development of deciduous shrubs, and limited variations later on, owing to concurrent leaf growth and mortality of evergreen shrubs. For most of the communities, the TFN:LAI ratio was constant along the entire sampling period, indicating that leaf growth and mortality, triggers for both LAI and TFN, are more important than leaf N retranslocation, which only affects TFN. A constant TFN:LAI ratio facilitates the determination of TFN from LAI, which is easier to measure or simulate. However, a sheltered community showed an increment in the LAI of the deciduous canopy in mid-late season, paralleled by a decreased TFN:LAI ratio.
AB - Assimilation and exchange of carbon for arctic ecosystems depend strongly on leaf area index (LAI) and total foliar nitrogen (TFN). For dry-mesic tundras, the seasonality of these characteristics is unexplored. We addressed this knowledge gap by measuring variations of LAI and TFN at five contrasting subarctic heaths during the growing season 2007, from about 2 weeks after bud burst until about 2 weeks before senescence. The communities generally showed an early season LAI and TFN increase, owing to leaf development of deciduous shrubs, and limited variations later on, owing to concurrent leaf growth and mortality of evergreen shrubs. For most of the communities, the TFN:LAI ratio was constant along the entire sampling period, indicating that leaf growth and mortality, triggers for both LAI and TFN, are more important than leaf N retranslocation, which only affects TFN. A constant TFN:LAI ratio facilitates the determination of TFN from LAI, which is easier to measure or simulate. However, a sheltered community showed an increment in the LAI of the deciduous canopy in mid-late season, paralleled by a decreased TFN:LAI ratio.
KW - Faculty of Science
KW - planter
KW - økologi
KW - næringsstofkredsløb
KW - arktis
KW - tundra
KW - plants
KW - ecology
KW - nutrient cycling
KW - arctic
KW - tundra
U2 - 10.1139/B09-016
DO - 10.1139/B09-016
M3 - Journal article
VL - 87
SP - 431
EP - 442
JO - Botany
JF - Botany
SN - 1916-2790
IS - 5
ER -
ID: 10787622