Decomposition Rates of Surficial and Buried Organic Matter and the Lability of Soil Carbon Stocks Across a Large Tropical Seagrass Landscape

2020 ◽  
Author(s):  
Jason L. Howard ◽  
Christian C. Lopes ◽  
Sara S. Wilson ◽  
Vicki McGee-Absten ◽  
Claudia I. Carrión ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Carbon ◽  
Carbon Stocks ◽  
Decomposition Rates ◽  
Soil Carbon Stocks

scholarly journals Greater soil carbon stocks and faster turnover rates with increasing agricultural productivity

SOIL ◽  
2017 ◽  
Vol 3 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Jonathan Sanderman ◽  
Courtney Creamer ◽  
W. Troy Baisden ◽  
Mark Farrell ◽  
Stewart Fallon
Keyword(s):  
Organic Matter ◽  
Soil Carbon ◽  
Sugar Content ◽  
Bulk Composition ◽  
Agricultural Productivity ◽  
Carbon Stocks ◽  
Decay Rates ◽  
Turnover Rates ◽  
Soil Carbon Stocks

Abstract. Devising agricultural management schemes that enhance food security and soil carbon levels is a high priority for many nations. However, the coupling between agricultural productivity, soil carbon stocks and organic matter turnover rates is still unclear. Archived soil samples from four decades of a long-term crop rotation trial were analyzed for soil organic matter (SOM) cycling-relevant properties: C and N content, bulk composition by nuclear magnetic resonance (NMR) spectroscopy, amino sugar content, short-term C bioavailability assays, and long-term C turnover rates by modeling the incorporation of the bomb spike in atmospheric 14C into the soil. After > 40 years under consistent management, topsoil carbon stocks ranged from 14 to 33 Mg C ha−1 and were linearly related to the mean productivity of each treatment. Measurements of SOM composition demonstrated increasing amounts of plant- and microbially derived SOM along the productivity gradient. Under two modeling scenarios, radiocarbon data indicated overall SOM turnover time decreased from 40 to 13 years with increasing productivity – twice the rate of decline predicted from simple steady-state models or static three-pool decay rates of measured C pool distributions. Similarly, the half-life of synthetic root exudates decreased from 30.4 to 21.5 h with increasing productivity, indicating accelerated microbial activity. These findings suggest that there is a direct feedback between accelerated biological activity, carbon cycling rates and rates of carbon stabilization with important implications for how SOM dynamics are represented in models.

scholarly journals Relationships between soil quality indicators, redox properties, and bioactivity of humic substances of soils under integrated farming, livestock, and forestry

Revista CERES ◽  
2018 ◽  
Vol 65 (4) ◽  
pp. 373-380 ◽  
Author(s):  
Marihus Altoé Baldotto ◽  
Lílian Estrela Borges Baldotto
Keyword(s):  
Organic Matter ◽  
Soil Carbon ◽  
Humic Substances ◽  
Soil Quality ◽  
Quality Indicators ◽  
Carbon Stocks ◽  
Redox Properties ◽  
Soil Quality Indicators ◽  
Integrated Farming ◽  
Soil Carbon Stocks

ABSTRACT Once it is stabilized in the soil, organic matter minimizes limitations of Brazilian Oxisols, such as low cation exchange capacity, low nutrient availability, toxicity due to high aluminum content, and phosphate adsorption. Moreover, humified organic matter fractions are bioactive. It is, therefore, important to evaluate the biostimulant ability of compounds present in soil carbon stocks to develop sustainable technologies for tropical agriculture based on renewable natural resources. The objective of this research was to correlate some soil quality indicators, redox properties, and bioactivity of humic acids isolated from integrated farming, livestock, and forestry systems aiming to understand the mechanisms involved in plant stimulation by humified organic matter. Carbon stocks and their stability were determined from oxidation by dichromatometry and iodometry, respectively. Bioactivity was assessed using yield data of corn indicator plants. The results indicated that when native-like forests were reintroduced instead of pastureland, soil carbon stocks and their stability increased along with overall improvements in soil fertility, chemical and physical properties, and soil biodiversity. The bioactivity of humic substances isolated from soils used in integrated crop, livestock, and forestry management was higher than that of soils derived from pastures or eucalyptus alone.

scholarly journals SOIL CARBON STOCKS AND LABILE FRACTIONS OF ORGANIC MATTER UNDER DIFFERENTS VEGETATIONS COVERAGES IN GURUPI – TO

FLORESTA ◽  
2021 ◽  
Vol 51 (3) ◽  
pp. 767
Author(s):  
Josue Luiz Marinho Junior ◽  
Renisson Neponuceno De Araújo Filho ◽  
Moacyr Cunha Filho ◽  
Raimundo Rodrigues Gomes Filho ◽  
Milton Marques Fernandes ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Carbon ◽  
Carbon Stocks ◽  
Soil Carbon Stocks

scholarly journals On the formation of high-latitude soil carbon stocks: Effects of cryoturbation and insulation by organic matter in a land surface model

2009 ◽  
Vol 36 (21) ◽  
Author(s):  
C. Koven ◽  
P. Friedlingstein ◽  
P. Ciais ◽  
D. Khvorostyanov ◽  
G. Krinner ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Carbon ◽  
High Latitude ◽  
Land Surface ◽  
Land Surface Model ◽  
Carbon Stocks ◽  
Surface Model ◽  
Soil Carbon Stocks

scholarly journals Greater soil carbon stocks and faster turnover rates with increasing agricultural productivity

2016 ◽  
Author(s):  
Jonathan Sanderman ◽  
Courtney Creamer ◽  
W. Troy Baisden ◽  
Mark Farrell ◽  
Stewart Fallon
Keyword(s):  
Organic Matter ◽  
Soil Carbon ◽  
Sugar Content ◽  
Bulk Composition ◽  
Agricultural Productivity ◽  
Carbon Stocks ◽  
Decay Rates ◽  
Turnover Rates ◽  
Soil Carbon Stocks

Abstract. Devising agricultural management schemes that enhance food security and soil carbon levels is a high priority for many nations. However, the coupling between agricultural productivity, soil carbon stocks and organic matter turnover rates is still unclear. Archived soil samples from four decades of a long-term crop rotation trial were analysed for soil organic matter (SOM) cycling relevant properties: C and N content, bulk composition by NMR spectroscopy, amino sugar content, short term C bioavailability assays, and long-term C turnover rates by modeling the incorporation of the bomb-spike in atmospheric 14C into the soil. After > 40 years under consistent management, topsoil carbon stocks ranged from 14 to 33 Mg C ha−1 and were linearly related to the mean productivity of each treatment. Measurements of SOM composition demonstrated increasing amounts of plant- and microbially-derived SOM along the productivity gradient. Under two modelling scenarios, radiocarbon data indicated overall SOM turnover time decreased from 40 to 13 years with increasing productivity; twice the rate of decline predicted from simple steady-state models or static three-pool decay rates of measured C pool distributions. Similarly, the half-life of synthetic root exudates decreased from 30.4 to 21.5 hours with increasing productivity indicating accelerated microbial activity. These findings suggest that there is a direct feedback between accelerated biological activity, carbon cycling rates and rates of carbon stabilization with important implications for how SOM dynamics are represented in models.

scholarly journals Long-term doubling of litter inputs accelerates soil organic matter degradation and reduces soil carbon stocks

2015 ◽  
Vol 127 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Oliva Pisani ◽  
Lisa H. Lin ◽  
Olivia O. Y. Lun ◽  
Kate Lajtha ◽  
Knute J. Nadelhoffer ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Soil Carbon ◽  
Carbon Stocks ◽  
Organic Matter Degradation ◽  
Soil Carbon Stocks

Predicted consequences of increased rainfall variability on soil carbon stocks in a semiarid environment

2016 ◽  
Vol 67 (1) ◽  
pp. 61-69
Author(s):  
M Forouzangohar ◽  
R Setia ◽  
DD Wallace ◽  
CR Nitschke ◽  
LT Bennett
Keyword(s):  
Soil Carbon ◽  
Rainfall Variability ◽  
Carbon Stocks ◽  
Semiarid Environment ◽  
Soil Carbon Stocks

Changes in soil carbon stocks under plantation systems and natural forests in Northeast India

2021 ◽  
Vol 446 ◽  
pp. 109500
Author(s):  
Gaurav Mishra ◽  
Avishek Sarkar ◽  
Krishna Giri ◽  
Arun Jyoti Nath ◽  
Rattan Lal ◽  
...  
Keyword(s):  
Soil Carbon ◽  
Northeast India ◽  
Carbon Stocks ◽  
Natural Forests ◽  
Soil Carbon Stocks

Erratum to “Soil carbon stocks in different bioenergy cropping systems including subsoil” [Soil Tillage Res. 155 (2016) 308–317]

2016 ◽  
Vol 158 ◽  
pp. 186
Author(s):  
Martin Gauder ◽  
Norbert Billen ◽  
Sabine Zikeli ◽  
Moritz Laub ◽  
Simone Graeff-Hönninger ◽  
...  
Keyword(s):  
Soil Carbon ◽  
Cropping Systems ◽  
Carbon Stocks ◽  
Soil Tillage ◽  
Soil Carbon Stocks ◽  
Bioenergy Cropping Systems
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