Distributions of fine root length and mass with soil depth in natural ecosystems of southwestern Siberia

Brédoire, Félix; Nikitich, Polina; Barsukov, Pavel; Derrien, Delphine; Litvinov, Anton; Rieckh, Helene; Rusalimova, Olga; Zeller, Bernd; Bakker, Mark R.

doi:10.1007/s11104-015-2717-9

Cited by 13 publications

(7 citation statements)

References 101 publications

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“…The δ 18 O of water in grasslands tended to be on the order of 2‰ greater than forests at both sites. The fine root mass density of the forest sites was larger in the deeper profile (>30 cm) than grasslands 30 (S1) and may facilitate hydraulic redistribution of these deeper and more depleted sources in the profile 56 – 58 , thus transporting more isotopically depleted water up to shallow soil profile depths. There were also differences at the site level.…”

Section: Discussionmentioning

confidence: 95%

“…The interaction term was included to account for the decreasing patterns of root density with depth. The fine root mass density (FRMD g cm −3 ) was previously reported 30 and the data used here are provided in the Supplementary material ( S2 ). Significant differences between sites and vegetation were tested at the α = 0.05 level and were determined via a Tukey post-hoc test using the R package multcomp 1.4-1 42 .…”

Section: Methodsmentioning

confidence: 99%

“…The impact of roots on ecosystem water status extends beyond ensuring connectivity between plant and soil and includes the redistribution of soil water via hydraulic lift 27 , the maintenance of proximal sources of soil water 28 , and controls over plant response to water stress 29 . Spatial patterns in fine root distributions of grasslands and forests in sub-taiga and forest-steppe bioclimates have been found to be primarily driven by climate and vegetation type 30 . In the same study, differences in specific root length and vertical distribution between grassland and forest species were also reported.…”

Section: Introductionmentioning

confidence: 99%

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Soil evaporation and organic matter turnover in the Sub-Taiga and Forest-Steppe of southwest Siberia

Kayler

Brédoire

McMillan

et al. 2018

Sci Rep

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Southwest Siberia encompasses the forest-steppe and sub-taiga climatic zones and has historically been utilized for agriculture. Coinciding with predicted changes in climate for the region is the pressure of agricultural development; however, a characterization of the soil water and carbon dynamics is lacking. We assessed current soil water properties and soil organic carbon turnover in forests and grasslands for two sites that span the forest steppe and sub-taiga bioclimatic zones. Soil evaporation was 0.62 ± 0.17 mm d−1 (mean ± standard error) in grasslands and 0.45 ± 0.08 mm d−1 in the forests of the forest-steppe site. Evaporation at the sub-taiga site was 1.80 ± 1.70 mm d−1 in grasslands and 0.96 ± 0.05 mm d−1 in forest plots. Evaporation was significantly greater at the sub-taiga site than the forest-steppe site. The density of fine roots explained the soil water isotopic patterns between vegetation types and sites. We found soil organic matter turnover to be three times faster in the sub-taiga site than in the forest-steppe site. Our results show that while climate factors, in particular snow levels, between the two sites are drivers for water and carbon cycles, site level hydrology, soil characteristics, and vegetation directly interact to influence the water and carbon dynamics.

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Section: Discussionmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soil evaporation and organic matter turnover in the Sub-Taiga and Forest-Steppe of southwest Siberia

Kayler

Brédoire

McMillan

et al. 2018

Sci Rep

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“…Toluene (10 µL toluene mL −1 soil solution; M. Lineres, unpublished results) was added to the suspension at the beginning in order to stop microbial activity. This biocide does not affect P physico-chemical processes (Bünemann et al, 2007). The phosphate ions in solution of the pre-equilibrated suspensions were labelled by introducing carrier-free 32 P ions in negligible concentrations but with known amounts of introduced radioactivity (R).…”

Section: Plant-available Phosphate Ionsmentioning

confidence: 99%

What is the P value of Siberian soils? Soil phosphorus status in south-western Siberia and comparison with a global data set

Brédoire¹,

Bakker²,

Augusto³

et al. 2016

Biogeosciences

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Abstract. Climate change is particularly strong in northern Eurasia and substantial ecological changes are expected in this extensive region. The reshaping and migration northwards of bioclimatic zones may offer opportunities for agricultural development in western and central Siberia. However, the bioclimatic vegetation models currently employed for projections still do not consider soil fertility, in spite of this being highly critical for plant growth. In the present study, we surveyed the phosphorus (P) status in the south-west of Siberia where soils have developed on loess parent material. We selected six sites differing in pedoclimatic conditions and the soil was sampled at different depths down to 1 m in aspen (Populus tremula L.) forest as well as in grassland areas. The P status was assessed by conventional methods and by isotope dilution kinetics. We found that P concentrations and stocks, as well as their distribution through the soil profile, were fairly homogeneous on the regional scale studied, although there were some differences between sites (particularly in organic P). The young age of the soils, together with slow kinetics of soil formation processes have probably not yet resulted in a sufficiently wide range of soil physico-chemical conditions to observe a more diverging P status. The comparison of our data set with similar vegetation contexts on the global scale revealed that the soils of south-western Siberia, and more generally of northern Eurasia, often have (very) high levels of total, organic and inorganic P. The amount of plant-available P in topsoils, estimated by the isotopically exchangeable phosphate ions, was not particularly high but was intermediate on the global scale. However, large stocks of plant-available P are stored in subsurface layers which currently have low fine-root exploration intensities. These results suggest that the P resource is unlikely to constrain vegetation growth and agricultural development under the present conditions or in the near future.

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“…They play a crucial role in plant survival potential and seedlings establishment after outplanting [8], and are regarded as a good indicator of adaptation strategies to climate change [9][10][11]. Although fine roots only comprise a small proportion of total root biomass, their production accounts to 33%-67% of annual net primary production in forest ecosystems [12], and they make a considerable contribution to annual carbon (C) fluxes due to their short lifespan and high decomposability [13][14][15]. Hence, fine root dynamics, such as fine root production and turnover, are key processes that drive biogeochemical nutrient cycling and stand productivity [16,17].…”

Section: Introductionmentioning

confidence: 99%

Fine Root Dynamics in Three Forest Types with Different Origins in a Subalpine Region of the Eastern Qinghai-Tibetan Plateau

Liu

Luo

Yang

et al. 2018

Forests

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Fine roots play a crucial role in plant survival potential and biogeochemical cycles of forest ecosystems. Subalpine areas of the Eastern Qinghai-Tibetan Plateau have experienced different forest re-establishment methods after clear-cutting primary forest. However, little is known about fine root dynamics of these forests originating from artificial, natural and their combined processes. Here, we determined fine root traits (biomass, production and turnover rate) of three subalpine forest types, i.e., Picea asperata Mast. plantation forest (artificial planting, PF), natural secondary forest (natural without assisted regeneration, NF) and P. asperata broadleaved mixed forest (natural regeneration after artificial planting, MF) composed of planted P. asperata and naturally regenerated native broadleaved species. At the soil depth of 0–30 cm, fine root biomass was the highest in PF and fine root production was the highest in NF, and both were the lowest in MF. Fine root dynamics of the three forest types tended to decrease with soil depth, with larger variations in PF. Fine root biomass and production were the highest in PF in 0–10 cm soil layer but were not significantly different among forest types in the lower soil layers. There were positive correlations between these parameters and aboveground biomass across forest types in soil layer of 0–10 cm, but not in the lower soil layers. Fine root turnover rate was generally higher in mixed forests than in monocultures at all soil depths. In conclusion, the natural regeneration procedure after clear-cutting in the subalpine region of western Sichuan seems to be superior from the perspective of fine root dynamics.

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Distributions of fine root length and mass with soil depth in natural ecosystems of southwestern Siberia

Cited by 13 publications

References 101 publications

Soil evaporation and organic matter turnover in the Sub-Taiga and Forest-Steppe of southwest Siberia

Soil evaporation and organic matter turnover in the Sub-Taiga and Forest-Steppe of southwest Siberia

What is the P value of Siberian soils? Soil phosphorus status in south-western Siberia and comparison with a global data set

Fine Root Dynamics in Three Forest Types with Different Origins in a Subalpine Region of the Eastern Qinghai-Tibetan Plateau

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