Growth, water relations and photosynthesis of seedlings and resprouts after fire

Clemente, Adelaide; Rego, Francisco; Correia, Otília

doi:10.1016/j.actao.2005.01.005

Cited by 69 publications

(59 citation statements)

References 17 publications

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“…Our results agreed with previous studies describing greater water stress in the seedlings of seeder species than in resprouters because of the size of their root systems since it influences the availability of deeper soil water reserves in summer [36]. According to [38], resprouters lose more turgor at lower water potentials than seeders.…”

Section: Discussionsupporting

confidence: 83%

“…Higher ΔH and ΔCOV have been related to the root:shoot ratio, higher in resprouters [36], which was related to increased water potential and leaf conductance after fire in resprouters. Resprouters also allocated a bigger proportion of biomass to stems, while obligate seeders with drought tolerance, described as post-fire seeders such as R. officinalis, increased the root biomass in young individuals to achieve a better soil water supply to photosynthetic organs [37].…”

Section: Morphological Responses To Drought and Salvage Loggingmentioning

confidence: 99%

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Post-Fire Seedling Recruitment and Morpho-Ecophysiological Responses to Induced Drought and Salvage Logging in Pinus halepensis Mill. Stands

Moya

Heras

López‐Serrano

et al. 2015

Forests

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Salvage logging is the commonest post-fire emergency action, but has unclear ecological effects. In the Mediterranean Basin, drought periods and fire regimes are changing and forest management should be adapted. In summer 2009, a mid-high severity fire burned 968 ha of Aleppo pine (Pinus halepensis Mill.) forest in southeast Spain, which was submitted to salvage logging six months later. In spring 2010, plots were set in untreated and logged areas to monitor the recruitment and survival of the main tree species and three companion species: Stipa tenacissima L. (resprouter), Cistus clusii Dunal and Rosmarinus officinalis L. (obligate seeders). We evaluated responses to different scenarios in relation to intensification of summer droughts and forest management to obtain differences in water stress, growth, and gas exchange to cope with summer drought. Drought was induced by using rain-exclusion shelters and recorded ecophysiological characteristics were obtained with a portable gas exchange system. The main tree species recruitment was poor, but companion species showed a high survival ratio. Lower water stress was found for obligate seeder seedlings, which was higher in logged areas with induced drought. The initial post-fire stage was similar for the studied areas. However, after two drought periods (2010 and 2011), significant differences were found in the morphological and ecophysiological responses. In the unmanaged area, the biggest size of individuals due to the most marked increases in height and coverage were observed mainly in resprouter S. tenacissima. In the area submitted to salvage logging, the growth ratios in plots with induced drought were OPEN ACCESSForests 2015, 6 1859 lower, mainly for seeders. Greater productivity was related to higher transpiration, stomatal conductance, and net photosynthetic ratio, but lower water use efficiency was found in obligate seeders with no drought induction, and S. tenacissima obtained higher values in untreated areas. Our results confirm that both forest management and intensification of summer droughts influenced the resilience and productivity of the ecosystems in the short term. Adaptive forest management after fire can imply successful survival and recovery of plant communities in the mid to long term. This study provide a scientific basis to develop tools for the post-fire restoration of serotinous pine forests occurring in low-altitudinal areas of the Mediterranean Basin, prone to summer droughts and fire events.

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Section: Discussionsupporting

confidence: 83%

Section: Morphological Responses To Drought and Salvage Loggingmentioning

confidence: 99%

Post-Fire Seedling Recruitment and Morpho-Ecophysiological Responses to Induced Drought and Salvage Logging in Pinus halepensis Mill. Stands

Moya

Heras

López‐Serrano

et al. 2015

Forests

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“…In this context, droughtresistant plant traits have been synthesized in several functional classifications, on the basis of leaf habit (Clemente et al 2005;Jacobsen et al 2007a), rooting structure (Kummerow 1981;Canadell and Zedler 1995;Jacobsen et al 2007a), regeneration strategy (Paula and Pausas 2006) or hydraulic architecture and drought resistance strategy (Levitt 1980;Tyree et al 1994;Valladares et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Morphological traits and water use strategies in seedlings of Mediterranean coexisting species

et al. 2009

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The distribution of plants is associated with their different patterns of response to their environment. Mediterranean plants have evolved a number of morphological and physiological adaptations that determine their ability to survive and grow, being an effective water uptake and use important factors for drought resistance. In this article, we evaluated interspecific differences in morphology, biomass allocation, and architectural traits and their relationship with water use strategies in seedlings of seven co-occurring Mediterranean species (Anthyllis cytisoides L., Genista scorpius L. DC., Myrtus communis L., Pistacia lentiscus L., Rosmarinus officinalis L., Spartium junceum L. and Ulex parviflorus Pourr.). The results showed that morphological root features vary among species and they are significantly correlated with root hydraulic conductance and leaf gas exchange variables. Species with high specific root length (SRL) showed a low hydraulic conductance per root length (K RRL ) but high specific hydraulic conductance (K As ). M. communis and P. lentiscus showed the most contrasting water use patterns with respect to the other species studied. The results are not affected when considering phylogenetic relatedness. Thus, the variability observed in root hydraulic properties and leaf gas exchange suggests important mechanisms for understanding species coexistence in water-limited ecosystems.

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“…Improvement in photosynthetic rate is one of the widely-described effects of the increase in nutrient content of regrowth material [41,42,62]. Other reported differences include chlorophyll levels, rubisco activity, carotenoid content and an increase in the flow of soil water to leaves [41,42], as well as modifications related to transpiration rate and stomatal conductance, which induce leaf cooling.…”

Section: Changes In Nutritional Status Associated With the Managementmentioning

confidence: 99%

“…Other reported differences include chlorophyll levels, rubisco activity, carotenoid content and an increase in the flow of soil water to leaves [41,42], as well as modifications related to transpiration rate and stomatal conductance, which induce leaf cooling. These changes, coupled with a reduction in leaf area without proportional reduction of the surface of water-absorbing roots [41,62,63], are a response to the absence of photoinhibition of photosynthesis in sprouting plants. The latter is a widespread phenomenon that is known to occur in rosewood seedlings [64].…”

Section: Changes In Nutritional Status Associated With the Managementmentioning

confidence: 99%

Sequential Management of Commercial Rosewood (Aniba rosaeodora Ducke) Plantations in Central Amazonia: Seeking Sustainable Models for Essential Oil Production

Krainovic

Almeida

Desconci

et al. 2017

Forests

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Rosewood (Aniba rosaeodora Ducke) is an endangered tree that produces essential oil of high commercial value. However, technical-scientific knowledge about cultivation is scarce and studies are needed to examine the management viability. The current study evaluated rosewood aboveground biomass management, measuring the export of nutrients resulting from harvesting and testing sustainable management models. The crown of 36 rosewood trees were pruned and 108 trees cut at 50 cm above the soil in two regions in Central Amazonia. Post-harvest performance of sprouting shoots was evaluated and after, sprouting shoots were pruned so that the development of two, three and all shoots was permitted. Nutrient stock estimation was calculated as the product of mass and nutrient concentration, which allowed nutritional replacement to be estimated. The pruning facilitates regrowth by 40.11% of the initial mass while by cut regrow 1.45%. Chemical attributes of regrowth biomass differed significantly prior to management and regrowth had a significant correlation with the reserves in root tissues and with the pre -management status of the individual tree. Driving sprouts resulted in significantly larger growth increments and may provide a form of management that can viably be adopted. Biomass sequential management resulted in high nutrient exports and the amount of fertilizer needed for replenishment depended on the intensity and frequency of cropping. Compared with the cut of the tree, pruning the canopy reduces fertilizers that are required to replenish amount by 44%, decreasing to 26.37% in the second rotation. The generated knowledge contributes to this silvicultural practice as it becomes ecologically and economically viable.

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Growth, water relations and photosynthesis of seedlings and resprouts after fire

Cited by 69 publications

References 17 publications

Post-Fire Seedling Recruitment and Morpho-Ecophysiological Responses to Induced Drought and Salvage Logging in Pinus halepensis Mill. Stands

Post-Fire Seedling Recruitment and Morpho-Ecophysiological Responses to Induced Drought and Salvage Logging in Pinus halepensis Mill. Stands

Morphological traits and water use strategies in seedlings of Mediterranean coexisting species

Sequential Management of Commercial Rosewood (Aniba rosaeodora Ducke) Plantations in Central Amazonia: Seeking Sustainable Models for Essential Oil Production

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