Thinning affects water use efficiency of hardwood saplings naturally recruited in a Pinus radiata D. Don plantation

D’Alessandro, Carmela Miriam; Saracino, Antonio; Borghetti, Marco

doi:10.1016/j.foreco.2005.10.010

Cited by 15 publications

(12 citation statements)

References 40 publications

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“…However, studies at different spatial and temporal scales showed conflicting results. Some authors reported a significant change in the diurnal patterns of the photosynthetic rate and stomatal conductance in sunlit leaves of the upper canopy of a coppice in central Italy [16] which suggests that it expressed less stomatal control than xeric-adapted species (e.g., Fraxinus ornus) [17]. By contrast, Manes et al [18] observed that three-years-old seedlings are able to cope with short-term water stress through stomata regulation.…”

Section: Introductionmentioning

confidence: 99%

Cross-Talk between Physiological and Metabolic Adjustments Adopted by Quercus cerris to Mitigate the Effects of Severe Drought and Realistic Future Ozone Concentrations

Cotrozzi

Remorini

Pellegrini

et al. 2017

Forests

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Global climate change represents a moving target for plant acclimation and/or adaptation, especially in the Mediterranean basin. In this study, the interactions of severe drought (20% of the effective daily evapotranspiration) and O 3 fumigation (80 ppb, 5 h day −1 , for 28 consecutive days) on (i) photosynthetic performance, (ii) cell membrane stability, (iii) hydric relations, (iv) accumulation of compatible solutes, and (v) lipophilic antioxidant compounds were investigated in young Quercus cerris plants. In addition to the typical drought-induced stomatal closure, imposition of water withholding dramatically influenced the profile of stress-associated metabolites, i.e., abscisic acid (ABA), proline, and lipophilic antioxidants. However, plants were not able to delay or prevent the negative effects of water deficit, the greatest impacting factor in this study. This translated into a steep decline of photosynthetic efficiency, leaf hydration, and membrane fluidity and permeability. When water stress was coupled with O 3 , plants orchestrated cross-talk among ABA, proline, and sugar in fully-expanded mature leaves, partially leading to a premature senescence.

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Section: Introductionmentioning

confidence: 99%

Cross-Talk between Physiological and Metabolic Adjustments Adopted by Quercus cerris to Mitigate the Effects of Severe Drought and Realistic Future Ozone Concentrations

Cotrozzi

Remorini

Pellegrini

et al. 2017

Forests

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“…Conversely, researches conducted on other species show no univocal response of WUE to changes in light availability: in some cases a decrease (Yakir and Israeli 1995;D'Alessandro et al 2006) and, in other cases, an increase in WUE (Welander and Ottosson 2000;Warren et al 2001) have been detected in response to increase in light availability. Differences among species could be due to different strategies used by plants to cope with changing light conditions.…”

Section: Discussionmentioning

confidence: 88%

“…It is also known that variation in light availability in understory has a remarkable effect not only on carbon assimilation rate but also on stomatal behaviour and, as a consequence, on leaf transpiration process (Yakir and Israeli 1995;D'Alessandro et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Apical dominance ratio as an indicator of the growth conditions favouring Abies alba natural regeneration under Mediterranean environment

et al. 2016

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As reported in several studies, the presence of Abies alba Mill (silver fir) has been declining throughout its natural range over a large part of mountainous belt in the Mediterranean area. In such a context, regeneration establishment depends mainly on the occurrence of a suitable combination of water and light availability. Thus, before planning any forest management practice, it is essential to investigate on the optimal microclimate conditions influencing the success of natural regeneration of silver fir. To this aim, changes in growth and photosynthesis together with C, N and O isotope compositions have been investigated on silver fir naturally recruited saplings, growing in mixed stands with Fagus sylvatica on Apennine mountains (southern Italy). The apical dominance ratio (ADR, ratio between apical shoot length and length of first whorl lateral twigs) has been used as an indicator for microclimate conditions in which saplings grow. Based on the range of ADR values (i.e. from 0.10 to 1.30), saplings were distributed in four classes. As expected, increases in height, root collar diameter and radial growth correspond to enhancing ADR values, gaining the optimal conditions in class IV. This latter also displayed the best performance in terms of maximum CO2 assimilation at saturating light (Amax) and water-use efficiency as assessed by carbon isotope discrimination analysis. Conversely, class I and II seem to display the highest performance in terms of CO2 respiration rate (Rd) and absolute water loss saving as assessed by the application of oxygen isotopes. We conclude that, in relatively mild Mediterranean areas, forest managers should promote silvicultural treatments favouring light conditions and migration of saplings towards class IV of ADR. This class represents the optimal microclimate for regeneration establishment of silver fir

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“…But our result is in contrast to the studies which were conducted by the leaf gas-exchange measurements in young paper birch (Betula papyrifera Marsh.) stands (Wang et al, 1995) and saplings of oak (Quercus cerris L.) and ash (Fraxinus ornus L.) forests (D'Alessandro et al, 2006). They attributed the increased leaf-level WUEi to increased PAR induced by their thinning treatments (D'Alessandro et al, 2006;Wang et al, 1995).…”

Section: Discussionmentioning

confidence: 99%

Responses of Forest Carbon and Water Coupling to Thinning Treatments Across Multiple Spatial Scales

Wang¹,

Campo²,

Wei³

et al. 2020

Preprint

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BackgroundWater-use efficiency (WUE) represents the coupling of forest carbon and water. Little is known about the responses of WUE to thinning at multiple spatial scales. The objective of this research was to use field measurements to understand short-term effects of two thinning treatments (T1: 4,500 stems ha-1; and T2: 1,100 stems ha-1) and the control (C: 27,000 stems ha-1) on WUE (the ratio of leaf photosynthesis to leaf transpiration, or tree growth to tree transpiration, or net stand above-ground biomass (AGB) accumulation to stand transpiration) and the intrinsic WUE (WUEi, the ratio of leaf photosynthesis to stomatal conductance or the net stand AGB accumulation to canopy conductance) in a 16-year old natural lodgepole pine forest. Leaf-level measurements were conducted in 2017, while tree- and stand-level measurements were conducted in both 2016 (the normal year) and 2017 (the drought year).ResultsThere was no significant effect of thinning on the tree- and stand-level WUE in 2016, while in 2017, only T2 exhibited significantly higher tree-level WUE (0.63 mm2 kg-1) than the C (0.06 mm2 kg-1), and the stand-level WUE values were significantly higher in the thinned stands, with the means of 0.34, 0.61 and 0.7 kg m-3 for the control, T1 and T2, respectively. Stand-level WUEi was, however, significantly higher in the unthinned stands than in the thinned stands. In contrast, the leaf-level WUE values were not significantly different from each other, while the leaf-level WUEi was statistically higher in C than in the thinned stands. Thinning changed the WUE-VPD relationships at tree and stand levels, but not at the leaf level.Conclusions The effects of thinning on forest carbon and water coupling differed with the spatial scales and the metrics (WUE or WUEi) of water use efficiency. Lacking consistent reponses of WUE metrics to thinning treatments across the spatial scales suggests that caution must be exercised when transferring and modeling WUE from one spatial scale to others. Both tree-level and stand-level WUE values in the more heavily thinning stands were significantly promoted under the drough condition, demonstrating that thinning can improve WUE and consequently support forests to cope with the drought effects.

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Thinning affects water use efficiency of hardwood saplings naturally recruited in a Pinus radiata D. Don plantation

Cited by 15 publications

References 40 publications

Cross-Talk between Physiological and Metabolic Adjustments Adopted by Quercus cerris to Mitigate the Effects of Severe Drought and Realistic Future Ozone Concentrations

Cross-Talk between Physiological and Metabolic Adjustments Adopted by Quercus cerris to Mitigate the Effects of Severe Drought and Realistic Future Ozone Concentrations

Apical dominance ratio as an indicator of the growth conditions favouring Abies alba natural regeneration under Mediterranean environment

Responses of Forest Carbon and Water Coupling to Thinning Treatments Across Multiple Spatial Scales

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