IMPACT OF EARTHWORMS OF DIFFERENT MORPHO-ECOLOGICAL GROUPS ON CARBON ACCUMULATION IN FOREST SOILS

To date, forest ecology has not made any clear conclusions regarding the impact of large saprophagous invertebrates such as earthworms on soil carbon dynamics. Some authors claim that earthworm activities result in decreased carbon accumulation. Other studies show that earthworms contribute to soil carbon accumulation. At the same time, many studies do not take into account the differences between trophic and digging activity of different morpho-ecological groups of earthworms in different soil horizons. The objective of this study was to carry out differentiated assessment of the impact of different morpho-ecological groups of earthworms on carbon accumulation and correspondent soil parameters (nitrogen content and С/N ratio) throughout the change in forest succession status. Field operations were performed in the spring and summer of 2016 and 2018 in three regions: Bryansk Oblast (Bryansk Forest reserve), Moscow Oblast (Moskva–Oka plain, Valuyevsky urban forest) and Northwest Caucasus (Krasnodar Krai, Apsheron forestry; Republic of Adygeya, Caucasian Biosphere Reserve). Three main stages of coniferous-broadleaf forest restoration after clear cuttings were identified in each region. Three test plots 50х50 m were allocated for each stage; geobotanical and soil descriptions as well as earthworm registration were carried out on each plot. It was found out that during the change in forest succession status the species composition and the set of morpho-ecological groups of earthworms became more complicated, but there was no successive replacement of any groups with others. Ambiguous effects of different morpho-ecological groups of earthworms on carbon accumulation in forest soils were revealed. Negative correlation was found between the total biomass of earthworms feeding on the soil surface (epigeic, epi-endogeic and anecic species) and litter store. In the humus horizon, the biomass of epi-endogeic species was positively correlated with the content of carbon. C/N ratio and nitrogen content are unidirectionally correlated with the biomass of earthworms in the horizons of their activity: with an increase in the biomass of earthworms of different morpho-ecological groups, the C/N ratio decreases, and the nitrogen content increases.

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Responses of Carbon Dynamics to Nitrogen Deposition in Typical Freshwater Wetland of Sanjiang Plain

Journal of Chemistry ◽

10.1155/2014/603948 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 3

Author(s):

Yang Wang ◽

Jingshuang Liu ◽

Longxue He ◽

Jingxin Dou ◽

Hongmei Zhao

Keyword(s):

Soil Carbon ◽

Nitrogen Deposition ◽

Carbon Dynamics ◽

N Deposition ◽

Sanjiang Plain ◽

Carbon Accumulation ◽

Total Biomass ◽

Soil System ◽

Carbon Fractions ◽

Soil Carbon Fractions

The effects of nitrogen deposition (N-deposition) on the carbon dynamics in typicalCalamagrostis angustifoliawetland of Sanjiang Plain were studied by a pot-culture experiment during two continuous plant growing seasons. Elevated atmospheric N-deposition caused significant increases in the aboveground net primary production and root biomass; moreover, a preferential partition of carbon to root was also observed. Different soil carbon fractions gained due to elevated N-deposition and their response intensities followed the sequence of labile carbon > dissolved organic carbon > microbial biomass carbon, and the interaction between N-deposition and flooded condition facilitated the release of different carbon fractions. Positive correlations were found between CO2and CH4fluxes and liable carbon contents with N-deposition, and flooded condition also tended to facilitate CH4fluxes and to inhibit the CO2fluxes with N-deposition. The increases in soil carbon fractions occurring in the nitrogen treatments were significantly correlated with increases in root, aboveground parts, total biomass, and their carbon uptake. Our results suggested that N-deposition could enhance the contents of active carbon fractions in soil system and carbon accumulation in plant of the freshwater wetlands.

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The influence of Carboniferous palaeoatmospheres on plant function: an experimental and modelling assessment

Philosophical Transactions of the Royal Society B Biological Sciences ◽

10.1098/rstb.1998.0196 ◽

1998 ◽

Vol 353 (1365) ◽

pp. 131-140 ◽

Cited By ~ 48

Author(s):

D. J. Beerling ◽

F. I. Woodward ◽

M. R. Lomas ◽

M. A. Wills ◽

W. P. Quick ◽

...

Keyword(s):

Carbon Dioxide ◽

Soil Carbon ◽

Primary Productivity ◽

Net Primary Productivity ◽

Global Scale ◽

Carbon Accumulation ◽

Late Carboniferous ◽

Atmospheric Composition ◽

Area Index ◽

The Impact

Geochemical models of atmospheric evolution predict that during the late Carboniferous, ca . 300 Ma, atmospheric oxygen and carbon dioxide concentrations were 35% and 0.03%, respectively. Both gases compete with each other for ribulose–1,5–bisphosphate carboxylase/oxygenase–the primary C–fixing enzyme in C 3 land plants: and the absolute concentrations and the ratio of the two in the atmosphere have the potential to strongly influence land–plant function. The Carboniferous therefore represents an era of potentially strong feedback between atmospheric composition and plant function. We assessed some implications of this ratio of atmospheric gases on plant function using experimental and modelling approaches. After six weeks growth at 35% O 2 and 0.03% carbon dioxide, no photosynthetic acclimation was observed in the woody species Betula pubescens and Hedera helix relative to those plants grown at 21% O 2 . Leaf photosynthetic rates were 29% lower in the high O 2 environment compared to the controls. A global–scale analysis of the impact of the late Carboniferous climate and atmospheric composition on vegetation function was determined by driving a process–based vegetation–biogeochemistry model with a Carboniferous global palaeoclimate simulated by the Universities Global Atmospheric Modelling Programme General Circulation Model. Global patterns of net primary productivity, leaf area index and soil carbon concentration for the equilibrium model solutions showed generally low values everywhere, compared with the present day, except for a central band in the northern land mass extension of Gondwana, where high values were predicted. The areas of high soil carbon accumulation closely match the known distribution of late Carboniferous coals. Sensitivity analysis with the model indicated that the increase in O 2 concentration from 21% to 35% reduced global net primary productivity by 18.7% or by 6.3 GtC yr –1 . Further work is required to collate and map at the global scale the distribution of vegetation types, and evidence for wildfires, for the late Carboniferous to test our predictions.

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Soil copper contamination effect on carbon mineralisation: evidence of a soil CO2 emission decrease from literature review

10.5194/egusphere-egu2020-2201 ◽

2020 ◽

Author(s):

Sereni Laura ◽

Guenet Bertrand ◽

Crouzet Olivier ◽

Lamy Isabelle

Keyword(s):

Soil Respiration ◽

Soil Carbon ◽

Ex Situ ◽

Soil Parameters ◽

Copper Contamination ◽

Carbon Mineralisation ◽

Cu Contamination ◽

C Mineralisation ◽

The Impact

Among all pollutants, copper (Cu) is of major environmental and toxicological concern with contamination from various origins. Moreover as a cation, Cu is easily complexed by the negatively charged soil organic matter (OM) inducing high concentrations in upper layers of soils where OM dominates. Due to its biotic and abiotic interactions with soil constituents Cu is expected to affect several soil processes among them the soil respiration, but studies provided contrasting results as soil respiration have been shown to decrease or increase with soil contamination depending on the studies.In this study, we aimed at assessing how soil respiration is affected by Cu contamination in order to quantifying as a first approach the GHG emissions for a contaminated soil. We performed a quantitative review of literature focusing on soil heterotrophic respiration (thus excluding autotrophic respiration from plants) which aimed at 1) assessing the impact of a copper contamination on soil carbon (C) mineralisation and thus CO2 emissions, and 2) hierarchizing the determinants of such an impact on C mineralisation compare to the influence of pedo-climatic soil parameters such as pH, clay percentage or the type of climate.On the basis of a selection of roughly 390 literature data, global main results showed a decrease in soil CO2 emission with an increase in soil Cu contamination. Data from ex situ spiking experiments could be easily differentiated from the ones originated from in situ natural contamination due to their sharper decrease in soil organic carbon mineralisation. Interestingly, ex situ spikes data on the short term provided a threshold: an increase in soil CO2 emissions was noticed for data below total soil Cu content of 180 mg kg-1 while a decrease was observed above this concentration. On the contrary, long-term in situ contamination due to anthropogenic activities (urbanisation, agriculture &#8230;) did not significantly impact soil carbon mineralisation except when we focused on the high inputs of industrial contamination (smelter, composted plant&#8230;). Soil pH was found as a variable of interest as acidic soils were more sensitive to Cu contamination for C mineralisation than neutral or alkaline soils, while the % of clay and the type of climate did not add explanation to the variation in C mineralisation. These results are discussed and the collected data allowed us to propose a general equation quantifying how soil respiration can be affected by a Cu contamination.

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The impact of different forest types on phytolith-occluded carbon accumulation in subtropical forest soils

Journal of Soils and Sediments ◽

10.1007/s11368-015-1259-3 ◽

2015 ◽

Vol 16 (2) ◽

pp. 461-466 ◽

Cited By ~ 12

Author(s):

Xiaodong Zhang ◽

Zhaoliang Song ◽

Kim McGrouther ◽

Jianwu Li ◽

Zimin Li ◽

...

Keyword(s):

Forest Soils ◽

Subtropical Forest ◽

Carbon Accumulation ◽

Forest Types ◽

The Impact ◽

Occluded Carbon

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Shifts in microbial metabolic pathway for soil carbon accumulation along subtropical forest succession

Soil Biology and Biochemistry ◽

10.1016/j.soilbio.2021.108335 ◽

2021 ◽

pp. 108335

Author(s):

Tiantian Zheng ◽

Hongtu Xie ◽

Grant L. Thompson ◽

Xuelian Bao ◽

Fangbo Deng ◽

...

Keyword(s):

Soil Carbon ◽

Metabolic Pathway ◽

Forest Succession ◽

Subtropical Forest ◽

Carbon Accumulation ◽

Soil Carbon Accumulation

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The Impact of Long-Term Nitrogen Addition on Microbial Community Composition in Three Hawaiian Forest Soils

The Scientific World JOURNAL ◽

10.1100/tsw.2001.450 ◽

2001 ◽

Vol 1 ◽

pp. 500-504 ◽

Cited By ~ 18

Author(s):

Teri C. Balser

Keyword(s):

Microbial Community ◽

Community Composition ◽

Forest Soils ◽

Microbial Community Composition ◽

Natural Fertility ◽

Soil Parameters ◽

N Addition ◽

A Site ◽

The Impact

We evaluated the microbial communities in three Hawaiian forest soils along a natural fertility gradient and compared their distinct responses to long-term nitrogen (N) additions. The sites studied have the same elevation, climate, and dominant vegetation, but vary in age of development, and thus in soil nutrient availability and nutrient limitation to plant growth. Fertilized plots at each site have received 100 kg ha year-1N addition for at least 8 years. Soil parameters, water content, pH, and ammonium and nitrate availability differed by site, but not between control and N-addition treatments within a site at the time of sampling. Microbial biomass also varied by site, but was not affected by N addition. In contrast, microbial community composition (measured by phospholipid analysis) varied among sites and between control and N-addition plots within a site. These data suggest that microbial community composition responds to N addition even when plant net primary productivity is limited by nutrients other than N. This may have implications for the behavior of forests impacted by atmospheric N deposition that are considered to be “nitrogen saturated,” yet still retain N in the soil.

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