Effect of thinning, pruning and nitrogen fertiliser application on transpiration, photosynthesis and water-use efficiency in a young Eucalyptus nitens plantation

Forrester, David I.; Collopy, John J.; Beadle, C. L.; Warren, Charles R.; Baker, Thomas

doi:10.1016/j.foreco.2011.11.019

Cited by 123 publications

(90 citation statements)

References 85 publications

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“…The techniques used in AGP alter the development patterns of the trees, given the lower density of plants in this system. Such low density can change rates of A, E and WUE between individuals of the same species (Forrester et al 2012).…”

Section: Discussionmentioning

confidence: 99%

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Mendes¹,

Lacerda²,

Fernandes³

et al. 2013

Theor. Exp. Plant Physiol.

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Physiological differences in the Cordia oncocalyx tree growing at different densities in two distinct areas were investigated.An agrosilvopastoral system (AGP) and a secondary forest (SF) were studied. Under both types of land-use, C. oncocalyx presented a relative frequency of approximately 50%, and absolute densities of 670 and 80 individuals per hectare, respectively. Net photosynthesis (A), stomatal conductance (g s ), and transpiration (E) were measured, and the SPAD index was recorded in sun leaves from the canopy and shade leaves from the lower canopy, in both the wet and dry seasons. We quantified the dry biomass of leaves and fruit on a per-tree basis at the end of the wet season. Net photosynthesis was higher in shaded leaves in the AGP in the wet season, reaching an average of 4.8 µmol m -2 s -1 against 3.2 µmol m -2 s -1 under SF. As trees began to shed their leaves at the beginning of the dry season and more radiation reached the shaded leaves, there was an increase in SF for A, depending on the intensity of light reaching the leaves. In the sun leaves, gas exchange was similar for the land-use systems during the wet season, but stronger in AGP than under SF during the dry season. This happened when the leaves in AGP retained more relative water content during a period of low gravimetric levels of the soil water. The lower tree density in AGP promoted a higher SPAD index and dry biomass in both the sun and shaded leaves, and allowed greater A, E and g s rates in the sun leaves at the beginning of the dry period.

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Section: Discussionmentioning

confidence: 99%

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Mendes¹,

Lacerda²,

Fernandes³

et al. 2013

Theor. Exp. Plant Physiol.

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“…Multiple forestry practices may also be combined and interact to modify the microenvironmental conditions of development, generally as to reduce stress and competition in order to favour growth (Forrester et al 2012). Thus, after an extreme drought event in 1976, stand decline was reduced in Picea abies stands that had previously been thinned in 1971 (Misson et al 2003): Compared to the control plot, heavy thinning had a more beneficial impact than moderate thinning (thinning from 36 to 14 or to 20 m 2 ha −1 basal area, respectively).…”

Section: Foreseen Evolutionary Impact Of Common Forestry Practicementioning

confidence: 99%

Considering evolutionary processes in adaptive forestry

Lefèvre

Boivin

Bontemps

et al. 2013

Annals of Forest Science

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Managing forests under climate change requires adaptation. The adaptive capacity of forest tree populations is huge but not limitless. Integrating evolutionary considerations into adaptive forestry practice will enhance the capacity of managed forests to respond to climate-driven changes. & Aims Focusing on natural regeneration systems, we propose a general framework that can be used in various and complex local situations by forest managers, in combination with their own expertise, to integrate evolutionary considerations into decision making for the emergence of an evolution-oriented forestry. & Methods We develop a simple process-based analytical grid, using few processes and parameters, to analyse the impact of forestry practice on the evolution and evolvability of tree populations. & Results We review qualitative and, whenever possible, quantitative expectations on the intensity of evolutionary drivers in forest trees. Then, we review the effects of actual and potential forestry practice on the evolutionary processes. We illustrate the complexity of interactions in two study cases: the evolutionary consequences for forest trees of biotic interactions and of highly heterogeneous environment. & Conclusion Evolution-oriented forestry may contribute adapting forests to climate change. It requires combining short-term and long-term objectives. We propose future lines of research and experimentation.

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“…However, most studies examining the effects of density on transpiration have focused on density control through thinning, a commonly used practice for the production of large diameter timber (STONEMAN et al, 1996;LESCH;SCOTT, 1997;FORRESTER et al, 2012). Importantly, controlling planting density by thinning may have a different effect than when density is defined during planting (WHITEHEAD et al, 1984).…”

Section: Discussionmentioning

confidence: 99%

“…Key components of the evapotranspiration (ET), i.e., transpiration (T), canopy interception (Ei) and soil evaporation (Es) were evaluated during two hydrological years in the period of peak of tree growth, between the ages of 1.7 and 3.7 years . We hypothesize that i) increasing planting density will increase evapotranspiration for both clones, explained by the increase in leaf area index (LAI) in higher densities (WHITE et al, 2009;FORRESTER et al, 2012); ii) The effect will be greater for the drought sensitive clone Urograndis, once its stomatal conductance is less sensitive than Grancam to the water deficit in the system, in our case, controlled by planting density (GENTIL, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…In one point of view, reducing plant density, by either planting fewer saplings per unit area or by thinning, has been proposed as a means of reducing forest water use (BRÉDA et al, 1995;FORRESTER et al, 2012;SOHN et al, 2013;DEL CAMPO et al, 2014). However, the high demand for clean energy (HABERL et al, 2011) and the possibility of having faster and higher profits (GUERRA et al, 2014) has increased the interest for shorter rotation systems controlled by lower spacing plantation.…”

Section: Introductionmentioning

confidence: 99%

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Physiological responses and soil water balance of clonal <i>Eucalyptus</i> under contrasting spacings and genotypes

Hakamada¹

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Effect of thinning, pruning and nitrogen fertiliser application on transpiration, photosynthesis and water-use efficiency in a young Eucalyptus nitens plantation

Cited by 123 publications

References 85 publications

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Considering evolutionary processes in adaptive forestry

Physiological responses and soil water balance of clonal <i>Eucalyptus</i> under contrasting spacings and genotypes

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