Рубрики:
WATER-USE EFFICIENCY
PACIFIC NORTHWEST
PLANTS
LEAF
PHOTOSYNTHESIS
NITROGEN
C-13
NUTRIENTS
LEAVES
FOREST
Кл.слова (ненормированные):
foliar nitrogen -- needle age -- specific leaf area -- water use efficiency -- delta(13) carbon
WATER-USE EFFICIENCY
PACIFIC NORTHWEST
PLANTS
LEAF
PHOTOSYNTHESIS
NITROGEN
C-13
NUTRIENTS
LEAVES
FOREST
Кл.слова (ненормированные):
foliar nitrogen -- needle age -- specific leaf area -- water use efficiency -- delta(13) carbon
Аннотация: Larches (Larix spp.), deciduous conifers, occur in the northern hemisphere in cold-temperate and boreal climates - an environment normally thought to favor ever-green tree species. We compare foliar carbon isotope discrimination (Delta), instantaneous water use efficiency, total foliar nitrogen concentration, and specific leaf area (for a subset of sites) between Larix spp. and co-occurring evergreen conifers at 20 sites throughout the natural range of larches. Except for Larix occidentalis in the xeric Intermountain West, USA, Delta is significantly (P < 0.05) greater for larches than co-occurring evergreen conifers at 77% of the sites, suggesting that larches use water less efficiently. At elevations greater than 3000 m, the Delta of Lar ix-spp. and co-occurring conifers converge, suggesting that water is not the limiting resource. Foliar nitrogen concentration and specific leaf area are two ecophysiological characteristics that are positively correlated with high photosynthetic capacity. Foliar nitrogen concentration is significantly greater for larches than evergreen conifers at 88% of the sites and specific leaf area is approximately three times greater for larches than co-occurring conifers. Future studies should examine the potential effect that global warming may have on the distribution of larch forests because the water use efficiency of larches is commonly less than cooccurring evergreen conifers and the boreal and high-latitude environments are likely to experience the greatest climate warming.
Полный текст,
WOS,
Scopus
Держатели документа:
Univ Wisconsin, Dept Forest Ecol & Management, Madison, WI 53706 USA
Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
Russian Acad Sci, Sukachev Forest Inst, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Kloeppel, B.D.; Gower, S.T.; Treichel, I.W.; Kharuk, S...