Abstract
경상남도 남해군의 유사한 입지환경에서 생육한 삼나무 조림지를 대상으로 47년생의 고밀도임분($667tree{\cdot}ha^{-1}$)과 49년생의 저밀도임분($267tree{\cdot}ha^{-1}$)으로 구분한 후 임분밀도에 따른 상대생장식과 현존량 확장계수를 비교하였다. 흉고직경을 독립변수로 하고 각 부위별 건중량을 종속변수로 하는 상대생장식은 고밀도임분의 가지, 저밀도임분의 잎과 종실을 제외하고 상대생장식의 유의성이 인정되었으며(P<0.05), 결정계수($R^2$)의 값은 0.80-0.96 범위였다. 또한 각 임분밀도에 대한 상대생장식(stand density-specific allometric equations)의 회귀계수(slope)에 유의적인 차가 없어(P>0.05), 일괄 상대생장식(generalized allometric equations)의 적용이 가능한 것으로 나타났다. 그러나 현존량 확장계수는 고밀도임분 1.33, 저밀도임분 1.50으로 임분밀도 간 유의적인 차가 있었다(P<0.05). 성숙한 삼나무 조림지의 바이오매스 추정을 위한 상대생장식의 경우 임분밀도의 영향이 크지 않으나 현존량 확장계수의 경우 임분밀도에 따라 상당한 차이가 있었다. This study was conducted to evaluate stand density-specific and generalized allometric equations, and biomass expansion factors (BEFs) for two stand densities (high density of 47-year-old: $667tree{\cdot}ha^{-1}$; low density of 49-year-old: $267tree{\cdot}ha^{-1}$) of Cryptomeria japonica plantations in Namhae-gun, located in the southern Korea. Biomass in each tree component, i.e. foliage, branch, and stem, was quantified by destructive tree harvesting. Allometric regression equations of each tree component were significant (P<0.05) with diameter at breast height (DBH) accounting for 80-96% of the variation except for branch biomass in high density or foliage and cone biomass in low density. Generalized allometric equations can be used to estimate the biomass of C. japonica plantations because the slopes of allometric equations were not significantly different by the stand density. The biomass expansion factors (BEFs) were significantly lower in the high stand density (1.33) than in the low stand density (1.50). The results indicate that BEFs were affected by different stand density, while allometric equations were little related to the stand density.
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Claims 8
Claim · model-written summary
Component allometric equations were significant except for high-density branch biomass and low-density foliage and cone biomass.
- Taxon
- Cryptomeria japonica
Cryptomeria japonicat0 - Outcome
- Allometric regression equations of each tree componente0
- Value
- 80-96%e0
- Qualifier
- except for branch biomass in high density or foliage and cone biomass in low densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Allometric regression equations of each tree component were significant (P<0.05) with diameter at breast height (DBH) accounting for 80-96% of the variation except for branch biomass in high density or foliage and cone biomass in low density.”
t0“Cryptomeria japonica”
Claim · model-written summary
Diameter at breast height accounted for 80-96% of component biomass variation.
- Taxon
- Cryptomeria japonicaCryptomeria japonicat0
- Outcome
- variatione0
- Value
- 80-96%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“diameter at breast height (DBH) accounting for 80-96% of the variation”
t0“Cryptomeria japonica”
Claim · model-written summary
Allometric equation slopes did not differ significantly by stand density.
- Taxon
- Cryptomeria japonicaCryptomeria japonicat0
- Outcome
- slopes of allometric equationse0
- Direction
- not significantly differente0
- Comparator
- stand densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“slopes of allometric equations were not significantly different by the stand density.”
t0“Cryptomeria japonica”
Claim · model-written summary
Generalized allometric equations can estimate C. japonica plantation biomass.
- Taxon
- C. japonicaCryptomeria japonicae0
- Outcome
- estimate the biomasse0
- Comparator
- stand densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Generalized allometric equations can be used to estimate the biomass of C. japonica plantations because the slopes of allometric equations were not significantly different by the stand density.”
Claim · model-written summary
The high-density stand had a biomass expansion factor of 1.33.
- Taxon
- Cryptomeria japonicaCryptomeria japonicat0
- Outcome
- biomass expansion factorse0
- Direction
- lowere0
- Value
- 1.33e0
- Setting
- high stand densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The biomass expansion factors (BEFs) were significantly lower in the high stand density (1.33) than in the low stand density (1.50).”
t0“Cryptomeria japonica”
Claim · model-written summary
The low-density stand had a biomass expansion factor of 1.50.
- Taxon
- Cryptomeria japonicaCryptomeria japonicat0
- Outcome
- biomass expansion factorse0
- Direction
- higherinferrede0
- Value
- 1.50e0
- Setting
- low stand densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The biomass expansion factors (BEFs) were significantly lower in the high stand density (1.33) than in the low stand density (1.50).”
t0“Cryptomeria japonica”
Claim · model-written summary
Biomass expansion factors were significantly lower at high than low stand density.
- Taxon
- Cryptomeria japonicaCryptomeria japonicat0
- Outcome
- biomass expansion factorse0
- Direction
- lowere0
- Comparator
- low stand densitye0
- Setting
- high stand densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The biomass expansion factors (BEFs) were significantly lower in the high stand density (1.33) than in the low stand density (1.50).”
t0“Cryptomeria japonica”
Claim · model-written summary
Allometric equations were little related to stand density.
- Taxon
- Cryptomeria japonicaCryptomeria japonicat0
- Outcome
- allometric equationse0
- Setting
- stand densitye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“allometric equations were little related to the stand density.”
t0“Cryptomeria japonica”