Photosynthetic and structural characteristics of canopy and shrub trees in a cool-temperate deciduous broadleaved forest: Implication to the ecosystem carbon gain

Hiroyuki Muraoka, Hiroshi Koizumi

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

To reveal the seasonal change of leaf ecophysiological and canopy characteristics and to evaluate the functional role of canopy and shrub tree species in forest CO2 uptake, we measured forest canopy leaf area index (LAI) using a hemispherical canopy photography technique, leaf CO 2 gas exchange and shoot architecture for canopy (Betula ermanii and Quercus crispula) and shrub (Hydrangea paniculata and Viburnum furcatum) tree species in a deciduous broadleaved forest in a cool-temperate region in central Japan. Canopy LAI and photosynthetic capacity of canopy tree leaves increased rapidly with leaf expansion. LAI reached its maximum in early summer but photosynthetic capacity reached its maximum in late summer. Development of photosynthetic capacity was dependent on the changes of leaf mass per area and leaf chlorophyll content (evaluated by SPAD). The seasonal maximum photosynthetic capacity of the leaves at the forest canopy top (B. ermanii and sun leaves of Q. crispula) was about more than double of the leaves in the shrub layer (H. paniculata, shade leaves of Q. crispula and V. furcatum). Light interception and photosynthetic carbon gain at a shoot level were simulated under three air temperature conditions by a three-dimensional canopy photosynthesis model (Y-plant) involving the combined leaf photosynthesis and stomatal conductance responses and shoot architecture. Results showed that (1) calculations without considering the heterogeneous light distribution in a foliage made by geometrical feature of plants would overestimate the photosynthetic carbon gain by +40% even at the canopy surface, and (2) the steep leaf angle in B. ermanii avoided midday depression of photosynthesis while the rather horizontal leaves in Q. crispula received excess light and heat load which led larger midday depression of photosynthesis. In addition to the large capacity of photosynthetic productivity of the canopy top foliage, our model also suggests the functional role of shrub species in forest ecosystem carbon gain, due to their high photosynthetic utilization efficiency of low light incidence available in the forest understory.

Original languageEnglish
Pages (from-to)39-59
Number of pages21
JournalAgricultural and Forest Meteorology
Volume134
Issue number1-4
DOIs
Publication statusPublished - 2005 Nov 30
Externally publishedYes

Fingerprint

temperate forest
deciduous forest
shrub
shrubs
canopy
ecosystems
carbon
ecosystem
leaves
Quercus mongolica
Betula ermanii
Hydrangea paniculata
photosynthesis
leaf area index
functional role
shoot
forest canopy
foliage
shoots
Viburnum

Keywords

  • AsiaFlux network
  • Cool-temperate deciduous forest
  • Leaf area index
  • Phenology
  • Photosynthesis
  • Shoot architecture
  • Takayama Experimental Forest

ASJC Scopus subject areas

  • Forestry
  • Atmospheric Science

Cite this

Photosynthetic and structural characteristics of canopy and shrub trees in a cool-temperate deciduous broadleaved forest : Implication to the ecosystem carbon gain. / Muraoka, Hiroyuki; Koizumi, Hiroshi.

In: Agricultural and Forest Meteorology, Vol. 134, No. 1-4, 30.11.2005, p. 39-59.

Research output: Contribution to journalArticle

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abstract = "To reveal the seasonal change of leaf ecophysiological and canopy characteristics and to evaluate the functional role of canopy and shrub tree species in forest CO2 uptake, we measured forest canopy leaf area index (LAI) using a hemispherical canopy photography technique, leaf CO 2 gas exchange and shoot architecture for canopy (Betula ermanii and Quercus crispula) and shrub (Hydrangea paniculata and Viburnum furcatum) tree species in a deciduous broadleaved forest in a cool-temperate region in central Japan. Canopy LAI and photosynthetic capacity of canopy tree leaves increased rapidly with leaf expansion. LAI reached its maximum in early summer but photosynthetic capacity reached its maximum in late summer. Development of photosynthetic capacity was dependent on the changes of leaf mass per area and leaf chlorophyll content (evaluated by SPAD). The seasonal maximum photosynthetic capacity of the leaves at the forest canopy top (B. ermanii and sun leaves of Q. crispula) was about more than double of the leaves in the shrub layer (H. paniculata, shade leaves of Q. crispula and V. furcatum). Light interception and photosynthetic carbon gain at a shoot level were simulated under three air temperature conditions by a three-dimensional canopy photosynthesis model (Y-plant) involving the combined leaf photosynthesis and stomatal conductance responses and shoot architecture. Results showed that (1) calculations without considering the heterogeneous light distribution in a foliage made by geometrical feature of plants would overestimate the photosynthetic carbon gain by +40{\%} even at the canopy surface, and (2) the steep leaf angle in B. ermanii avoided midday depression of photosynthesis while the rather horizontal leaves in Q. crispula received excess light and heat load which led larger midday depression of photosynthesis. In addition to the large capacity of photosynthetic productivity of the canopy top foliage, our model also suggests the functional role of shrub species in forest ecosystem carbon gain, due to their high photosynthetic utilization efficiency of low light incidence available in the forest understory.",
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