Below- and aboveground architecture of Androstachys johnsonii prain: topological analysis of the root and shoot systems

Magalhães, Tarquinio Mateus; Seifert, Thomas

doi:10.1007/s11104-015-2527-0

Cited by 8 publications

(9 citation statements)

References 32 publications

(65 reference statements)

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“…To better assess the root architecture, the root topological parameters defined by Fitter (1987) were evaluated. Root magnitude (M) was evaluated as the number of external links of a root, root altitude (a), as the maximum external path length of the root, numbers of root nodes (Nd) were counted, and the topological index (TI) was calculated as the ratio of log altitude over log magnitude (Magalhães and Seifert 2015). Other composite parameters were calculated, such as root to shoot ratio (R/S) as RFW/SFW, and the specific root length (SRL, cm/g) as RL/RFW.…”

Section: Soil Analysismentioning

confidence: 99%

Physiological and morphological characterisation of Limonium species in their natural habitats: Insights into their abiotic stress responses

et al. 2020

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Background and aims Morphological and biochemical traits of four halophytes of the genus Limonium were analysed in plants sampled from salt marshes in SE Spain. This work aimed to explore the mechanism(s) behind the adaptation of these species to stressful habitats, with particular emphasis on responses to drought.Methods Plants of each species together with soil samples were collected in summer, which is the most stressful season in the Mediterranean. Soil parameters and plant morphological traits were determined, and the levels of several biochemical stress markers in plants were measured using spectrophotometric assays. A multivariate analysis was performed to correlate soil and plant data. Results Morphological characteristics regarding the underground system topology and several biochemical traits (higher foliar Ca 2+ , sucrose and glucose, and lower proline, glycine-betaine and fructose) clearly separate L. santapolense individuals from plants of the other three species. Conclusions Drought tolerance of L. santapolense in the field is mostly dependent on morphological adaptations: when growing in an arid location, plants of this species develop long taproots that can extract water from the deep, moist layers of the soil.

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Section: Soil Analysismentioning

confidence: 99%

Physiological and morphological characterisation of Limonium species in their natural habitats: Insights into their abiotic stress responses

et al. 2020

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“…Considering the fact that 90% of the lateral roots of A. johnsonii trees are located in the first node, which is located close to the ground level [ 16 , 17 , 38 , 50 ] it can be inferred that the 81.20% of the root system (found up to 61.2 cm in depth) is composed by root collar and lateral roots and therefore, the remaining portion of the taproot constitutes less than 20% of the root system biomass. This can be verified by summing the average taproot and lateral roots biomasses, which is equal to 82.43%, very close to the percentage of the root system biomass found at 20% of the taproot depth (81.20%).…”

Section: Discussionmentioning

confidence: 99%

“…Mecrusse is a forest type where the main tree species, many times the only one, in the upper canopy is A. johnsonii . Detailed description of the species, forest type and study area can be found in Magalhães and Seifert [ 16 , 17 , 38 , 50 ].…”

Section: Methodsmentioning

confidence: 99%

“…It has been suggested by Herrel et al [ 49 ] that for a fixed amount of biomass, a network of several small roots is more resistant to tension than a few large structural roots. This means that a root system with a larger taproot and several smaller lateral roots, as in the case of A. johnsonii trees [ 50 ], is more resistant to tension and therefore may have a better anchoring capacity than otherwise.…”

Section: Introductionmentioning

confidence: 99%

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Allometric equations for estimating belowground biomass of Androstachys johnsonii Prain

Magalhães

2015

Carbon Balance Manage

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BackgroundThe belowground component of the trees is still poorly known because it needs labour- and time-intensive in situ measurements. However, belowground biomass (BGB) constitutes a significant share of the total forest biomass. I analysed the BGB allocation patterns, fitted models for estimating root components and root system biomasses, and called attention for its possible use in predicting anchoring functions of the different root components.ResultsMore than half and almost one third of BGB is allocated to the lateral roots and to the root collar, respectively. More than 80% of the BGB is found at a depth range of 9.6–61.2 cm. As the tree size increased, the proportion of BGB allocated to taproots decreased and that allocated to lateral roots increased. All independent models performed almost equally, with the predictors explaining, on average, 98% of the variation in the BGB.ConclusionsIt was hypothesised that BGB allocation patterns are a response of the anchoring functions of the tap and lateral roots and therefore, root component biomass models can be used as a methodology to predict anchoring functions of the different root components. Based on the fact that all models performed almost equally, the models using either diameter at breast height (DBH) exclusively as a predictor should be preferred, as tree height is difficult to measure. Models using the root collar diameter (RCD) only should be preferred when the tree is found cut down, as sometimes the RCD is affected by root buttress. Given the large sample size, the validation results, and the coverage of a wide geographical, soil and climatic range, the models fitted can be applied in all A. johnsonii stands in Mozambique.

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“…The climate throughout the study region is dry tropical, with the exception of humid tropical areas in western Panda and southwestern Mandlakaze districts [22][23][24][25][26][27]; their warm or rainy season occurs from October to March, and their cool or dry season occurs from March to September [23][24][25][26][27]. More description on Androstachys johnsonii Prain and mecrusse woodlands can be foud in Magalhães [28] and Magalhães and Seifert [29][30][31][32].…”

Section: Study Areamentioning

confidence: 99%

Estimates of Tree Biomass, and Its Uncertainties Through Mean-of-Ratios, Ratio-of-Means, and Regression Estimators in Double Sampling: A Comparative Study of Mecrusse Woodlands

Magalhães¹,

Seifert

2015

AJAF

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Frequently, biomass expansion factors (BEFs), the respective biomass densities, and their uncertainties are computed without taking into account the appropriate estimators. The objective of this study was to compare the estimates of BEF, BEF-based biomass densities, and their uncertainties using different estimators (mean-of-ratios, ratio-of-means, and regression estimators) in double sampling. Our results demonstrated that increased uncertainty is associated with regressionbased biomass densities, and that the computation of BEF using merchantable timber volume should utilize regression estimators, not the usual ratio estimators, which preferably, should be avoided altogether, as they are found to be subjective and more susceptible to errors and personal judgment.

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Below- and aboveground architecture of Androstachys johnsonii prain: topological analysis of the root and shoot systems

Cited by 8 publications

References 32 publications

Physiological and morphological characterisation of Limonium species in their natural habitats: Insights into their abiotic stress responses

Physiological and morphological characterisation of Limonium species in their natural habitats: Insights into their abiotic stress responses

Allometric equations for estimating belowground biomass of Androstachys johnsonii Prain

Estimates of Tree Biomass, and Its Uncertainties Through Mean-of-Ratios, Ratio-of-Means, and Regression Estimators in Double Sampling: A Comparative Study of Mecrusse Woodlands

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