Response of anatomical structures in tree roots to an erosion event on the southeastern Tibetan Plateau

Sun, Lianpeng; Wang, Xiaodan; Hong, Jiangtao

doi:10.1016/j.geomorph.2013.09.007

Cited by 10 publications

(3 citation statements)

References 45 publications

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“…Much progress has been made during the last several decades in sheet erosion reconstruction. Previously unexamined tree species (Sun, Wang, Hong 2014) and even shrubs (Chartier, Rostagno, Roig 2009) have been successfully used for erosion rate determination. Corona et al (2011) demonstrated that tree roots respond to decreased soil cover before actual root exposure.…”

Section: Introductionmentioning

confidence: 99%

Detailed reconstruction of gully headcut retreat using exposed tree roots: a case study from the Vsetínské vrchy Mts. (Outer Western Carpathians)

Šilhán¹

2018

Geografie

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Gully erosion is a widespread natural hazard that causes substantial financial losses every year. Dendrogeomorphic (tree ring-based) methods are a good alternative approach for assessing gully development in forested areas. The majority of previous dendrogeomorphic studies dealing with erosion focused on sheet erosion or erosion rates in the active channels of old, stabilized gullies. This study aims to asses newly originated gully development based on an analysis of exposed tree roots. Moreover, the root exposure data were used to calculate rates of linear and areal gully headcut retreat (GHR). In total, 81 samples (microcuts) from common spruce (Picea abies (L.) Karst) were analyzed for anatomical responses to root exposure. The existence of the shallow channel preceding the gully itself was identified. This GHR reconstruction (for a limited time period of eight years) provides evidence of highly active gully development in the forested area of the Flysch Carpathians that is comparable with results from semi-arid regions.

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Section: Introductionmentioning

confidence: 99%

Detailed reconstruction of gully headcut retreat using exposed tree roots: a case study from the Vsetínské vrchy Mts. (Outer Western Carpathians)

Šilhán¹

2018

Geografie

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“…From a methodological perspective, major (recent) advances in root-based erosion rate estimations are related (i) the high reliability and accuracy of exposure signals and ways to detect based on anatomical changes in root wood (Rubiales et al 2008;Corona et al 2011) and (ii) the impedance of soil to determine the depth of the eroded soil layer more accurately (Gärtner 2007;Corona et al 2011). So far, existing studies have been based exclusively on exposed roots orientated in parallel position (PAR) to the slope, which may reduce significantly the number of samples available for analysis, even more so on slopes with strong erosion where tree cover tends to be scarce (Bodoque et al 2005(Bodoque et al , 2011McAuliffe et al 2006;Sun et al 2014). Perpendicular roots (PER), by contrast, have been systematically disregarded in the past as they were thought to induce a bias to reconstruction as a result of sedimentation upslope of the root and scour erosion in the downslope direction (Gärtner et al 2001;Bodoque et al 2005Bodoque et al , 2011Corona et al 2011;Lopez-Sáez et al 2011;Sun et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…So far, existing studies have been based exclusively on exposed roots orientated in parallel position (PAR) to the slope, which may reduce significantly the number of samples available for analysis, even more so on slopes with strong erosion where tree cover tends to be scarce (Bodoque et al 2005(Bodoque et al , 2011McAuliffe et al 2006;Sun et al 2014). Perpendicular roots (PER), by contrast, have been systematically disregarded in the past as they were thought to induce a bias to reconstruction as a result of sedimentation upslope of the root and scour erosion in the downslope direction (Gärtner et al 2001;Bodoque et al 2005Bodoque et al , 2011Corona et al 2011;Lopez-Sáez et al 2011;Sun et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Combining terrestrial laser scanning and root exposure to estimate erosion rates

et al. 2015

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Aims This paper aims to analyze the reliability of exposed roots oriented perpendicular to the slope to quantify sheet erosion rates based on accurate reconstruction of topography using terrestrial laser scanner (TLS). Methods The study was performed in an experimental sandy badland located in Central Spain. Sampling procedures were conducted in three different homogenous hydrological response units (HRU). We derived eroded soil thickness from by obtaining accurate microtopographic data using TLS. In addition, dendrogeomorphic procedures, based on anatomical changes in root rings, were used to determine the first year of exposure of 46 Pinus pinaster roots.Results Results indicate that medium-term (±30 year) erosion rates obtained from roots growing perpendicular to the slope were significantly different from those obtained from exposed roots growing parallel to the slope (p-value <0.05). However, at short term (up to 5 years), result agree with those obtained from erosion pin monitoring at the study site, which confirms the potential of reconstructions based on perpendicular roots. ConclusionThe utility of exposed perpendicular roots coupled with accurate eroded soil estimation has been proved. It allows the extension of the applicability of dendrogeomorphic approaches, particularly for ungauged badlands where instrumental data is scarce or completely missing.

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Quantification of cliff retreat in coastal Quaternary sediments using anatomical changes in exposed tree roots

Lopez-Saez

Corona

Morel

et al. 2018

Earth Surf Processes Landf

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Sea cliffs represent 80% of the world's coasts and can be found virtually in all types of morphogenetic environments. Most studies on rocky environments focused on the impacts of modern sea level rise on cliff stability derived from sequential surveys, direct measurements or erosional features in anthropogenic structures. In this study, we explore the potential of dendrogeomorphic techniques to quantify multidecadal changes in coastal environments on Porquerolles Island (France). We sampled a total of 56 cross‐sections from 16 Pinus halepensis Mill. roots growing on former alluvial deposits and on sandy‐gravelly cliffs to quantify mean annual cliff retreat rates as well as changes in cliff geometry. Anatomical changes in roots have been used successfully in the past to quantify continuous denudation rates on slopes, channel incision and gullying processes but the approach has not been used so far in a coastal cliff context. At Porquerolles Island, reconstructed rates of cliff retreat cover 30–40 years and show average erosion rates between 0.6 and 3.9 cm yr−1 (average: 2.1 cm yr−1). Highest rates are observed at Pointe de la Tufière (2.6–3.9 cm yr−1), a small rock promontory that is more exposed to wave and storm surges than the remainder of the study area. By contrast, lower erosion rates are recorded at cliffs protected by the La Courtade pocket beach (0.6–1.9 cm yr−1). This contribution demonstrates that dendrogeomorphic analyses of roots clearly have a significant potential and that they are a powerful tool for the quantification of multidecadal rates of cliff retreat in areas where measurements of past erosion are lacking. More specifically, the approach also has clear advantages over the shorter time series obtained with repeat monitoring (e.g. terrestrial laser scanning, sensors, erosion pins) or over longer, but more coarsely resolved records obtained from aerial photographs or radio‐nuclides. © 2018 John Wiley & Sons, Ltd.

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Response of anatomical structures in tree roots to an erosion event on the southeastern Tibetan Plateau

Cited by 10 publications

References 45 publications

Detailed reconstruction of gully headcut retreat using exposed tree roots: a case study from the Vsetínské vrchy Mts. (Outer Western Carpathians)

Detailed reconstruction of gully headcut retreat using exposed tree roots: a case study from the Vsetínské vrchy Mts. (Outer Western Carpathians)

Combining terrestrial laser scanning and root exposure to estimate erosion rates

Quantification of cliff retreat in coastal Quaternary sediments using anatomical changes in exposed tree roots

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