Relationships among plant litter, fine roots, and soil organic C and N across an aridity gradient in northern Patagonia, Argentina

Carrera, Analía Lorena; Bertiller, Mónica B.

doi:10.2980/17-3-3359

Cited by 27 publications

(17 citation statements)

References 52 publications

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“…Additionally, aridity has been identified to be a major factor affecting bacterial diversity, community composition and taxon abundance in this system . Therefore, with increasing aridity, microbially mediated litter decomposition may also change due to altered microbial community composition, which may further influence soil C and N (Carrera and Bertiller, 2010). Paralleling our results, He et al (2014) found that C and N concentrations in soil particle-size fractions were positively correlated with MAP; moreover, they considered that MAP was better than MAT to model the variation of soil C stock in an Inner Mongolia grassland.…”

Section: Discussionsupporting

confidence: 74%

“…However, compared with these well-described patterns of variation in soil C and N stocks along climate and soil particle size gradients, the relative influence of these factors on terrestrial C and N pools under climate change scenarios such as increasing aridity is less clear (Delgado-Baquerizo et al, 2013). Previous studies found that soil C and N tends to decrease with increasing aridity (that is the degree of dryness of the climate at a given location) largely due to decreased primary productivity, as well as other ecosystem processes, such as reduction of total plant cover, shifts of species composition, changes of litter quality, altered litter decomposition rates (Carrera and Bertiller, 2010;Delgado-Baquerizo et al, 2013;Sanaullah et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China

et al. 2016

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Abstract. Climate factors such as aridity significantly influence soil carbon (C) and nitrogen (N) stocks in terrestrial ecosystems. Further, soil texture plays an important role in driving changes of soil C and N contents at regional scale. However, it remains uncertain whether such changes resulted from the variation of different soil particle–size factions and/or the C and N concentrations in those fractions. We examined the distribution of total C and N in both bulk soil and different soil particle–size fractions, including sand (53–2000 µm), silt (2–53 µm), and clay (< 2 µm), along a 3000 km transect in arid and semi-arid grasslands of northern China. Across the whole transect, sand content was positively and silt content was negatively correlated with increasing aridity. Carbon content in bulk soils (0–10 cm) ranged from 4.36 to 46.16 Mg C ha−1, while N content ranged from 0.22 to 4.28 Mg N ha−1 across different sampling sites on the transect. The total C and N concentrations and contents in bulk soils as well as in the three particle–size fractions tended to be negatively correlated with aridity. The concentrations and contents of total C and N in bulk soils were positively correlated with silt and clay contents and negatively correlated with sand content. Positive correlations were observed between the concentrations and contents of C or N in bulk soils and the C or N concentrations in the three soil particle–size fractions. By characterizing such a large scale aridity gradient, our results highlight that aridity would decrease soil C and N contents both by favoring increased sand content and by decreasing C and N concentrations in all the three soil fractions. These patterns thus have significant implications for understanding soil C and N sequestration under scenarios of increasing aridity in global drylands that are predicted to occur this century.

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Section: Discussionsupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China

et al. 2016

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“…Accordingly, the significantly lower carbon stocks in trees and understory vegetation in the AS forests at 11-20 years are the key reason for significantly lower litter carbon stocks at this age range, as compared to those in the NR forests. In spite of low carbon stocks in the forest floor litter, it plays a critical role in carbon cycling as it influences nutrients and provides soil carbon sources through its decomposition process [41,42].…”

Section: Discussionmentioning

confidence: 99%

Aerial Seeding: An Effective Forest Restoration Method in Highly Degraded Forest Landscapes of Sub-Tropic Regions

Xiao

Wei

Liu

et al. 2015

Forests

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Abstract:Carbon stock is an important indicator of cumulative ecosystem productivity. Using this indicator, and based on field sampling data, this paper compared the long-term difference in carbon stocks between aerial seeding (AS) and natural regeneration (NR) forests of Pinus massoniana in sub-tropic forests, China, in order to assess the effectiveness of AS in a highly degraded forest landscape. The results showed that the carbon stocks of stems, branches, roots, and trees (including stems, branches, leaves, and roots) were 140%, 85%, 110%, and 110%, significantly higher (p < 0.05) in the NR forests than those in the AS forests at the ages of 11-20 years, respectively. In addition, the carbon stocks of understory, litter and soil were also 176%, 151%, and 77%, significantly higher (p < 0.05) in the NR forests than those in the AS forests at the same age range, respectively. However, with increasing age (i.e., >21 years), those differences became statistically insignificant (p > 0.05). The total carbon stocks of the two forest types also showed a similar pattern. Those results clearly demonstrate that AS was an effective mean for restoring carbon stocks in highly degraded areas, even though their early growth was lower than the NR forests, and thus can be applied in the regions where the areas with limited seed sources and road accessibility.

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“…Brantley and Young (2008) observed that high litterfall and litter N concentration associated with M. cerifera result in substantial N cycling and explain large soil N differences between sites with and without stands of M. cerifera. The dry, less vegetated upper dunes were expected to have lower nitrogen concentrations because of exposure to greater soil leaching and higher temperature (Carrera and Bertiller, 2010).…”

Section: Landscape-level Predictors Of Aboveground Decompositionmentioning

confidence: 99%

Thresholds of Change in Decomposition Rate along a Dune/Swale Transect on a Virginia Barrier Island

Graziani

Day

2015

Journal of Coastal Research

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Graziani, D.J. and Day, F.P., 2015. Thresholds of change in decomposition rate along a dune/swale transect on a Virginia barrier island. Journal of Coastal Research, 31(1), 148-154. Coconut Creek (Florida), ISSN 0749-0208.The objective of the current study was to examine fine spatial scale variation in aboveground decomposition rate over a barrier island dune/swale gradient in relation to the ground-water-free surface, soil nitrogen, and associated ecosystem states in order to identify thresholds of process or state change. The litterbag study was conducted on the Virginia Coast Reserve-Long Term Ecological Research Site in Virginia, United States. Mean aboveground decay rate (yr À1 ) ranged from 0.339 (upper dune) to 0.699 (marsh/lower dune transition). The upper dune, marsh, and lower dune (Morella thicket side) had the lowest aboveground decay rates. The marsh edge, marsh/lower dune transition and Morella thicket exhibited the highest decomposition rates. Our results did not suggest that soil N content was a good indicator of state change or system process rates, whereas, distance to ground water demonstrated a significant relationship with aboveground decay. Relatively small (approximately 0.2-0.4 m) increases or decreases in elevation affected decay rates and community state. Free-surface thresholds that cause state changes or shifts in ecosystem processes provide the capability to project changes prompted by sea-level rise or shifts in other free surfaces over entire landscapes. Our results suggest that the ground-water-free surface is a good candidate for making such projections.

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Relationships among plant litter, fine roots, and soil organic C and N across an aridity gradient in northern Patagonia, Argentina

Cited by 27 publications

References 52 publications

Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China

Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China

Aerial Seeding: An Effective Forest Restoration Method in Highly Degraded Forest Landscapes of Sub-Tropic Regions

Thresholds of Change in Decomposition Rate along a Dune/Swale Transect on a Virginia Barrier Island

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Relationships among plant litter, fine roots, and soil organic C and N across an aridity gradient in northern Patagonia, Argentina

Cited by 27 publications

References 52 publications

Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China

Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China

Aerial Seeding: An Effective Forest Restoration Method in Highly Degraded Forest Landscapes of Sub-Tropic Regions

Thresholds of Change in Decomposition Rate along a Dune/Swale Transect on a Virginia Barrier Island

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Product

Resources

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Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China

Carbon and nitrogen contents in particle–size fractions of topsoil along a 3000 km aridity gradient in grasslands of northern China