Growth of ponderosa pine thinned to different stocking levels in northern Arizona /

Ronco, Frank.; Edminster, Carleton B.; Trujillo, David P.; Forest, Rocky Mountain; Station, Range Experiment

doi:10.5962/bhl.title.98639

Cited by 37 publications

(29 citation statements)

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“…Volume (V) at the start of each period and V 2 were used as covariates in the analysis of volume PAI. These covariates were derived from studies documenting relations between tree growth and density (Miller and Tarrant, 1983;Ronco et al, 1985;Oliver and Edminster, 1988). sured in 1994, followed similar trends to that of shrub cover (Table 2).…”

Section: Discussionmentioning

confidence: 99%

Changes in Ponderosa Pine Site Productivity following Removal of Understory Vegetation

Busse

Cochran

Barrett

1996

Soil Science Soc of Amer J

101

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Section: Discussionmentioning

confidence: 99%

Changes in Ponderosa Pine Site Productivity following Removal of Understory Vegetation

Busse

Cochran

Barrett

1996

Soil Science Soc of Amer J

101

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“…The stand is ;35.6 ha in area (Ronco et al 1985), and is dominated by ponderosa pine (Pinus ponderosa var. The stand is ;35.6 ha in area (Ronco et al 1985), and is dominated by ponderosa pine (Pinus ponderosa var.…”

Section: Study Sitementioning

confidence: 99%

Homeostatic Maintenance Of Ponderosa Pine Gas Exchange In Response To Stand Density Changes

McDowell

Adams

Bailey

et al. 2006

Ecological Applications

182

191

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Homeostatic maintenance of gas exchange optimizes carbon gain per water loss. Homeostasis is regulated by short-term physiological and long-term structural mechanisms, both of which may respond to changes in resource availability associated with competition. Therefore, stand density regulation via silvicultural manipulations may facilitate growth and survival through mechanisms operating at both short and long timescales. We investigated the responses of ponderosa pine (Pinus ponderosa) to stand basal area manipulations in Arizona, USA. Stand basal area was manipulated to seven replicated levels in 1962 and was maintained for four decades by decadal thinning. We measured basal area increment (BAI) to assess the response and sustainability of wood growth, carbon isotope discrimination (A) inferred from annual rings to assess the response of crown gas exchange, and ratios of leaf area to sapwood area (A(l):A(s)) to assess longer term structural acclimation. Basal area treatments increased soil water potential (r2 = 0.99) but did not affect photosynthetic capacity. BAI increased within two years of thinning, and the 40-year mean BAI was negatively correlated with stand basal area (r2 = 0.98). delta was negatively correlated with stand basal area for years 5 through 12 after thinning (r2 = 0.90). However, delta was relatively invariant with basal area for the period 13-40 years after initial thinning despite maintenance of treatment basal areas via repeated decadal thinnings. Independent gas exchange measurements verified that the ratio of photosynthesis to stomatal conductance was invariant with basal area, but absolute values of both were elevated at lower basal areas. A(l):A(s) was negatively correlated with basal area (r2 = 0.93). We hypothesize that increased A(l):A(s) is a homeostatic response to increased water availability that maximizes water-use efficiency and whole-tree carbon uptake. Elevated A(l):A(s) of trees at low basal areas was associated with greater resilience to climate, i.e., greater absolute BAI during drought; however, trees with high A(l):A(s) in low basal area stands also exhibited the greatest sensitivity to drought, i.e., greater relative decline in BAI.

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“…Thinning of these forests is effective in increasing individual tree growth (Ronco et al, 1985;Feeney et al, 1998;Skov et al, 2005), decreasing tree water stress Skov et al, 2004;Wallin et al, 2004), increasing tree defense against bark beetles through increased resin production , and increasing leaf nitrogen concentration and hence photosynthetic capacity in some cases (Feeney et al, 1998;Wallin et al, 2004). The few long-term studies of prescribed burning in Arizona ponderosa pine forests suggest that frequent burning can impact tree nitrogen and water relations, and growth.…”

Section: Introductionmentioning

confidence: 95%

Long-term impacts of stand management on ponderosa pine physiology and bark beetle abundance in northern Arizona: A replicated landscape study

Zausen

Kolb

Bailey

et al. 2005

Forest Ecology and Management

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Growth of ponderosa pine thinned to different stocking levels in northern Arizona /

Cited by 37 publications

References 0 publications

Changes in Ponderosa Pine Site Productivity following Removal of Understory Vegetation

Changes in Ponderosa Pine Site Productivity following Removal of Understory Vegetation

Homeostatic Maintenance Of Ponderosa Pine Gas Exchange In Response To Stand Density Changes

Long-term impacts of stand management on ponderosa pine physiology and bark beetle abundance in northern Arizona: A replicated landscape study

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