Ecophysiology of Forests

Waring, Richard H.; Ludlow, A. R.

doi:10.1002/9780470757062.ch8

Cited by 2 publications

(1 citation statement)

References 90 publications

(97 reference statements)

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“…Developmental effects largely accounted for any observed shifts in biomass fractions. Many studies of forest stands show that RMF declines with resource availability when chronologically equivalent stands are compared (Giardina et al, 2004;Landsberg and Gower, 1997;Sigurdsson et al, 2001;Waring and Ludlow, 2001). Our data agree with these results (Fig.…”

Section: Effects Of Resource Amendments On Biomass Distributionsupporting

confidence: 90%

Forest production responses to irrigation and fertilization are not explained by shifts in allocation

Coyle¹,

Coleman²

2005

Forest Ecology and Management

141

118

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Production increases in intensively managed forests have been obtained by improving resource availability through water and nutrient amendments. Increased stem production has been attributed to shifts in growth from roots to shoot, and such shifts would have important implications for belowground carbon sequestration. We examined above and belowground growth and biomass accumulation and distribution in two eastern cottonwood clones and American sycamore receiving irrigation (I), fertilization (F), or irrigation + fertilization (IF) and compared with non-treated controls (C). Aboveground growth and biomass accumulation responded positively to both I and F in all genotypes. After three growing seasons, the largest trees were sycamore receiving the IF treatment, with a total mean annual biomass production of 9.4 Mg ha À1 yr À1. Total cottonwood mean annual biomass production in both clones was >5.0 Mg ha À1 yr À1 in the IF treatment. Aboveground biomass production was 6.3 and >3.1 Mg ha À1 yr À1 for sycamore and cottonwoods, respectively. Total root mass fraction was lower in high resource treatments and declined as stands aged. To compare allocation in trees of equal size, we used allometric relationships between above and belowground tissue. Allometric relationships between woody perennial tissues rarely differed among treatments. Improved resource availability caused large increases in growth and consequently accelerated development, but it had little effect on belowground allocation that was not explained by development. Reports of shifting belowground allocation due to soil resource availability must account for developmental effects if they are to accurately evaluate direct impacts of soil resources. #

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Section: Effects Of Resource Amendments On Biomass Distributionsupporting

confidence: 90%

Forest production responses to irrigation and fertilization are not explained by shifts in allocation

Coyle¹,

Coleman²

2005

Forest Ecology and Management

141

118

View full text Add to dashboard Cite

show abstract

The relationship between tree height and leaf area: sapwood area ratio

et al. 2002

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The leaf area to sapwood area ratio (A :A) of trees has been hypothesized to decrease as trees become older and taller. Theory suggests that A :A must decrease to maintain leaf-specific hydraulic sufficiency as path length, gravity, and tortuosity constrain whole-plant hydraulic conductance. We tested the hypothesis that A :A declines with tree height. Whole-tree A :A was measured on 15 individuals of Douglas-fir (Pseudotsuga menziesii var. menziesii) ranging in height from 13 to 62 m (aged 20-450 years). A :A declined substantially as height increased (P=0.02). Our test of the hypothesis that A :A declines with tree height was extended using a combination of original and published data on nine species across a range of maximum heights and climates. Meta-analysis of 13 whole-tree studies revealed a consistent and significant reduction in A :A with increasing height (P<0.05). However, two species (Picea abies and Abies balsamea) exhibited an increase in A :A with height, although the reason for this is not clear. The slope of the relationship between A :A and tree height (ΔA :A/Δh) was unrelated to mean annual precipitation. Maximum potential height was positively correlated with ΔA :A/Δh. The decrease in A :A with increasing tree size that we observed in the majority of species may be a homeostatic mechanism that partially compensates for decreased hydraulic conductance as trees grow in height.

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Ecophysiology of Forests

Cited by 2 publications

References 90 publications

Forest production responses to irrigation and fertilization are not explained by shifts in allocation

Forest production responses to irrigation and fertilization are not explained by shifts in allocation

The relationship between tree height and leaf area: sapwood area ratio

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