Management-induced organic carbon accumulation in paddy soils: The role of organo-mineral associations

2013 ◽  
Vol 126 ◽  
pp. 60-71 ◽  
Author(s):  
Livia Wissing ◽  
Angelika Kölbl ◽  
Werner Häusler ◽  
Peter Schad ◽  
Zhi-Hong Cao ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Accumulation ◽  
Paddy Soils ◽  
Mineral Associations

Contrasting contribution of fungal and bacterial residues to organic carbon accumulation in paddy soils across eastern China

2019 ◽  
Vol 55 (8) ◽  
pp. 767-776 ◽  
Author(s):  
Yinhang Xia ◽  
Xiangbi Chen ◽  
Yajun Hu ◽  
Shengmeng Zheng ◽  
Zhao Ning ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Eastern China ◽  
Carbon Accumulation ◽  
Paddy Soils

Organic carbon accumulation on soil mineral surfaces in paddy soils derived from tidal wetlands

Geoderma ◽  
2014 ◽  
Vol 228-229 ◽  
pp. 90-103 ◽  
Author(s):  
Livia Wissing ◽  
Angelika Kölbl ◽  
Peter Schad ◽  
Tino Bräuer ◽  
Zhi-Hong Cao ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Accumulation ◽  
Paddy Soils ◽  
Tidal Wetlands ◽  
Mineral Surfaces ◽  
Soil Mineral

scholarly journals New nutrients exert fundamental control on dissolved organic carbon accumulation in the surface Atlantic Ocean

2016 ◽  
Vol 113 (38) ◽  
pp. 10497-10502 ◽  
Author(s):  
Cristina Romera-Castillo ◽  
Robert T. Letscher ◽  
Dennis A. Hansell
Keyword(s):  
Organic Carbon ◽  
Atlantic Ocean ◽  
Dissolved Organic Carbon ◽  
Euphotic Zone ◽  
Carbon Accumulation ◽  
Global Ocean ◽  
Biological Pump ◽  
Nutrient Input ◽  
Order Of Magnitude

The inventories of carbon residing in organic matter dissolved in the ocean [dissolved organic carbon (DOC)] and in the atmosphere as CO2 are of the same order of magnitude, such that small changes in the DOC pool could have important consequences in atmospheric carbon and thus climate. DOC in the global ocean is largely formed in the sunlit euphotic zone, but identifying predictable controls on that production is an important yet unrealized goal. Here, we use a testable and causative correlation between the net production of DOC and the consumption of new nutrients in the euphotic zone of the Atlantic Ocean. We demonstrate that new nutrients introduced to the euphotic zone by upwelling in divergence zones and by winter convective overturn of the water column, and the primary production associated with those nutrients, are the ultimate driver of DOC distributions across the Atlantic basins. As new nutrient input will change with a changing climate, the role of DOC in the ocean’s biological pump should likewise be impacted.

Early responses of vegetation and soil organic carbon to waterlogging and winter wildfire on abandoned red paddy soils

2014 ◽  
Vol 38 (6) ◽  
pp. 626-634
Author(s):  
TIAN Wen-Wen ◽  
◽  
WANG Wei ◽  
CHEN An-Lei ◽  
LI Yu-Yuan ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Paddy Soils

Changes in sediment and organic carbon accumulation in a highly-disturbed ecosystem: The Sacramento-San Joaquin River Delta (California, USA)

2009 ◽  
Vol 59 (4-7) ◽  
pp. 154-163 ◽  
Author(s):  
Elizabeth A. Canuel ◽  
Elizabeth J. Lerberg ◽  
Rebecca M. Dickhut ◽  
Steven A. Kuehl ◽  
Thomas S. Bianchi ◽  
...  
Keyword(s):  
Organic Carbon ◽  
River Delta ◽  
Carbon Accumulation ◽  
San Joaquin River

scholarly journals Organic mulching promotes soil organic carbon accumulation to deep soil layer in an urban plantation forest

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Xiaodan Sun ◽  
Gang Wang ◽  
Qingxu Ma ◽  
Jiahui Liao ◽  
Dong Wang ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon Content ◽  
Fine Roots ◽  
Soil Layer ◽  
Carbon Accumulation ◽  
Bulk Soil ◽  
Organic Mulch ◽  
The Impact ◽  
Soc Fractions

Abstract Background Soil organic carbon (SOC) is important for soil quality and fertility in forest ecosystems. Labile SOC fractions are sensitive to environmental changes, which reflect the impact of short-term internal and external management measures on the soil carbon pool. Organic mulching (OM) alters the soil environment and promotes plant growth. However, little is known about the responses of SOC fractions in rhizosphere or bulk soil to OM in urban forests and its correlation with carbon composition in plants. Methods A one-year field experiment with four treatments (OM at 0, 5, 10, and 20 cm thicknesses) was conducted in a 15-year-old Ligustrum lucidum plantation. Changes in the SOC fractions in the rhizosphere and bulk soil; the carbon content in the plant fine roots, leaves, and organic mulch; and several soil physicochemical properties were measured. The relationships between SOC fractions and the measured variables were analysed. Results The OM treatments had no significant effect on the SOC fractions, except for the dissolved organic carbon (DOC). OM promoted the movement of SOC to deeper soil because of the increased carbon content in fine roots of subsoil. There were significant correlations between DOC and microbial biomass carbon and SOC and easily oxidised organic carbon. The OM had a greater effect on organic carbon fractions in the bulk soil than in the rhizosphere. The thinnest (5 cm) mulching layers showed the most rapid carbon decomposition over time. The time after OM had the greatest effect on the SOC fractions, followed by soil layer. Conclusions The frequent addition of small amounts of organic mulch increased SOC accumulation in the present study. OM is a potential management model to enhance soil organic matter storage for maintaining urban forest productivity.

scholarly journals The Role of Organic Matter on Uranium Precipitation in Zoovch Ovoo, Mongolia

Minerals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 310 ◽  
Author(s):  
Dimitrios Rallakis ◽  
Raymond Michels ◽  
Marc Brouand ◽  
Olivier Parize ◽  
Michel Cathelineau
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Late Cretaceous ◽  
Uranium Deposit ◽  
Vitrinite Reflectance ◽  
Driven Systems ◽  
Sem Observation ◽  
Organic Matter Type ◽  
Clay Layers

The Zoovch Ovoo uranium deposit is located in East Gobi Basin in Mongolia. It is hosted in the Sainshand Formation, a Late Cretaceous siliciclastic reservoir, in the lower part of the post-rift infilling of the Mesozoic East Gobi Basin. The Sainshand Formation corresponds to poorly consolidated medium-grained sandy intervals and clay layers deposited in fluvial-lacustrine settings. The uranium deposit is confined within a 60- to 80-m-thick siliciclastic reservoir inside aquifer driven systems, assimilated to roll-fronts. As assessed by vitrinite reflectance (%Rr < 0.4) and molecular geochemistry, the formation has never experienced significant thermal maturation. Detrital organic matter (type III and IV kerogens) is abundant in the Zoovch Ovoo depocenter. In this framework, uranium occurs as: (i) U-rich macerals without any distinguishable U-phase under SEM observation, containing up to 40 wt % U; (ii) U expressed as UO2 at the rims of large (several millimeters) macerals and (iii) U oxides partially to entirely replacing macerals, while preserving the inherited plant texture. Thus, uranium is accumulated gradually in the macerals through an organic carbon–uranium epigenization process, in respect to the maceral’s chemistry and permeability. Most macerals are rich in S and, to a lesser extent, in Fe. Frequently, Fe and S contents do not fit the stoichiometry of pyrite, although pyrite also occurs as small inclusions within the macerals. The organic matter appears thus as a major redox trap for uranium in this kind of geological setting.

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