Mineralisation of soil organic carbon in two Andisols under oil palm: an incubation study into controlling factors

Soil Research ◽  
2018 ◽  
Vol 56 (1) ◽  
pp. 105 ◽  
Author(s):  
I. Goodrick ◽  
P. N. Nelson
Keyword(s):  
Organic Matter ◽  
Temperature Sensitivity ◽  
Oil Palm ◽  
Turnover Rate ◽  
Incubation Temperature ◽  
Agricultural Soils ◽  
Total Carbon ◽  
Turnover Rates ◽  
Total Carbon Content ◽  
Al And Fe Oxides

Understanding the factors controlling stability against mineralisation of soil organic matter is important for predicting changes in carbon stocks under changed environment or management. Soil carbon dynamics in oil palm plantations are little studied and have some characteristics that are unusual compared with other agricultural soils, such as high management-induced spatial variability and warm moist conditions. The aim of this work was to determine the factors controlling the mineralisability of the intermediate-stability carbon fraction of volcanic ash surface soils (0–5 and 15–20 cm depth) from oil palm plantations in Papua New Guinea. Soils with carbon contents of 2.2–35.2%, from areas with low and high organic matter inputs, were incubated for up to 812 days and soil respiration was measured periodically. Mean carbon turnover rates were 0.18–1.58, 0.07–0.23 and 0.03–0.07 a–1 on Days 54, 379 and 812 respectively. Turnover rate was initially (Day 54) correlated with pre-incubation total carbon content (r = 0.88), the ratio of permanganate-oxidisable carbon to total carbon (r = 0.62) and the ratio of oxalate-extractable Al and Fe to total carbon (r = –0.51 and –0.54 respectively), but the correlations decreased with time, being insignificant on Day 812. In the soils that had changed from C4 grassland 25 years previously, turnover rate was negatively correlated with δ13C, which increased with depth, but δ13C did not change significantly over the course of the incubation. Temperature sensitivity of mineralisation varied little, despite large differences in soil properties and changes in mineralisation rate. This suggested that turnover rates were affected to similar extents by biochemical recalcitrance and physical protection, as these two factors influence temperature sensitivity in opposing directions. Physico-chemical protection of organic matter appeared largely related to interaction with poorly crystalline Al and Fe oxides.

scholarly journals Modern Landfills as Potential Feed Back Processes to Counteract Global Warming

2017 ◽  
pp. 780-787
Author(s):  
Torleif Bramryd ◽  
Michael Johansson
Keyword(s):  
Carbon Dioxide ◽  
Organic Matter ◽  
Organic Carbon ◽  
Carbon Dioxide Emissions ◽  
Landfill Gas ◽  
Mineral Soil ◽  
Motor Fuel ◽  
Total Carbon ◽  
Water Evaporation ◽  
Total Carbon Content

Provided that produced biogas is effectively collected, landfills are important sinks for organic carbon compensating for emissions of CO2 from burning of fossil fuels. Sequestrating of long-lived organic carbon in the landfill itself is the most pronounced factor, but also other processes during landfill management will increase the capture and binding of CO2.. Compost produced in connection to the landfills and applied as soil improvement, is another important sink for organic carbon.The landfills in the World have been estimated to accumulate around 100 x 106 metric tons of C. Normally about 25-40 percent of the total carbon content in the waste can be converted into biogas in traditional landfills. During landfilling most of the organic carbon in fossil derived products, like plastics, synthetic rubber, textiles and other synthetic materials, As these products take part in the methane gas production, the landfill gas (biogas) can be regarded as a true biofuel. In contrast to incineration, high moisture content in the waste will not decrease the yield of energy per ton of waste. In a reactor landfill treating approximately 100 000 tons of waste per year, a longlived organic fraction corresponding to about 45 000 metric tons of carbon dioxide is longterm accumulated each year. This compensates for the annual carbon dioxide emissions from about 15 000 – 20 000 cars, provided that each one runs 15 000 km per year with fossil fuel. The technique for effective collection of landfill gas, and new techniques to upgrade and liquefy the biogas, have decreased the risk for emissions to the atmosphere. Modern bioreactor landfills have been estimated to have less than 10% diffuse biogas emissions to the atmosphere. Also in Sweden (Helsingborg), plants are built to convert landfill gas to upgraded, liquefied motor fuel. This will lead to strongly reduced diffuse emissions of landfill gas to the atmosphere. The utilization of leachates as forest fertilizer results in an improved biomass production and increased accumulation of soil organic matter. Increased tree and field layer productivity also means that the potential for water evaporation (eg. evapotranspiration) increase, reducing the costs for waste-water treatment or the risk for diffuse ground water pollution. Also in the mineral soil, increased long-lived fractions of humus normally are found. This should be added to the carbon accumulating effect of the landfill itself, where long-lived organic matter, mainly derived from lignin and from fossil fractions as plastics and synthetic textiles is long-term accumulated. In this respect the landfill system has similar effects compared to natural peatlands and lake and sea sediments, Ifproduced biogas is collected effectively, the landfill thus can be an important factor to counteract the “green-house effect” and climate change.

scholarly journals Stability and biodegradability of organic matter from Arctic soils of Western Siberia: insights from <sup>13</sup>C-NMR spectroscopy and elemental analysis

Solid Earth ◽  
2016 ◽  
Vol 7 (1) ◽  
pp. 153-165 ◽  
Author(s):  
E. Ejarque ◽  
E. Abakumov
Keyword(s):  
Organic Matter ◽  
Nmr Spectroscopy ◽  
Climate Warming ◽  
Western Siberia ◽  
Total Carbon ◽  
The Arctic ◽  
Total Carbon Content ◽  
Ambient Temperatures ◽  
Arctic Soils ◽  
Spatial Coverage

Abstract. Arctic soils contain large amounts of organic matter which, globally, exceed the amount of carbon stored in vegetation biomass and in the atmosphere. Recent studies emphasise the potential sensitivity for this soil organic matter (SOM) to be mineralised when faced with increasing ambient temperatures. In order to better refine the predictions about the response of SOM to climate warming, there is a need to increase the spatial coverage of empirical data on SOM quantity and quality in the Arctic area. This study provides, for the first time, a characterisation of SOM from the Gydan Peninsula in the Yamal Region, Western Siberia, Russia. On the one hand, soil humic acids and their humification state were characterised by measuring the elemental composition and diversity of functional groups using solid-state 13C-nuclear magnetic resonance (NMR) spectroscopy. Also, the total mineralisable carbon was measured. Our results indicate that there is a predominance of aliphatic carbon structures, with a minimal variation of their functional-group composition both regionally and within soil depth. This vertical homogeneity and low level of aromaticity reflects the accumulation in soil of lowly decomposed organic matter due to cold temperatures. Mineralisation rates were found to be independent of SOM quality, and to be mainly explained solely by the total carbon content. Overall, our results provide further evidence on the sensitivity that the soils of Western Siberia may have to increasing ambient temperatures and highlight the important role that this region can play in the global carbon balance under the effects of climate warming.

scholarly journals The Influence of Afforestation on Upland Soils: The Use of ‘Bomb 14C’ Enrichment as a Quantitative Tracer for Changes in Organic Status

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 637-643 ◽  
Author(s):  
D D Harkness ◽  
A F Harrison
Keyword(s):  
Organic Matter ◽  
Carbon Content ◽  
Growth Period ◽  
Soil Samples ◽  
Total Carbon ◽  
Soil Horizons ◽  
Total Carbon Content ◽  
Soil Carbon Content ◽  
Fresh Organic Matter ◽  
Carbon Inventory

A series of soil samples were collected in November 1984 from five stands of Sitka spruce planted at recorded times between 1951 and 1968. Within a comprehensive program of ecologic and biogeochemical analyses, natural 14C measurements on selected organic components of the 0 to 5cm soil horizons serve to quantify progressive changes induced in the organic carbon inventory and relative to that of the original grassland. Points of particular interest are: 1) an enhanced input of fresh organic matter in the years immediately following planting; this, in parallel with a net decrease in the total carbon content of the topsoil; 2) this freshly introduced carbon predominates in the soil profile even after 30 years of afforestation; 3) during the 15- to 30-year growth period, the soil carbon content remains constant but progressive changes occur in its biogeochemical composition and rate of turnover.

scholarly journals Soil Organic Matter Quality in Soils With Different Levels of Manure Fertilisation

2020 ◽  
Vol 31 (2) ◽  
pp. 17-23
Author(s):  
Marcin Becher ◽  
Krzysztof Pakuła ◽  
Krzysztof Czapliński
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Total Carbon ◽  
Cultivated Plants ◽  
Sequential Fractionation ◽  
Organic Matter Quality ◽  
Total Carbon Content ◽  
Soil Organic Matter Quality ◽  
Different Levels

Abstract Soil organic matter (SOM) significantly affects the growth, development and yield of cultivated plants. In the era of increasing agriculture intensification and adverse changes in the crop structure as well as climate change, it is important to know the processes affecting the accumulation and degradation of SOM. This paper aims to assess the quality of organic matter in Stagnic Luvisol fertilised with bovine manure to varying degrees. Soil samples were taken in spring from topsoil after pre-sowing treatments. Three soil profiles were selected: soil fertilised with manure annually at a dose of 30 t ha−1, soil fertilised with manure every 4 years at the same dose and soil deprived of organic fertilisation in the past several years. The following laboratory analyses were performed (soil pH, total carbon content). Sequential fractionation of organic matter was carried out based on the Schnitzer method. In humic acid preparations, the elemental composition (CHNO and H/C ratio) was determined and spectrophotometric properties were measured. The conducted tests revealed a significant impact of manure fertilisation on the quantity and quality of organic matter. In the soil fertilised with manure annually, a much larger amount of SOM was found with a greater share of labile forms. In addition, humic acids extracted from the soil were characterised by lower maturity as well as molecular weight and condensation of the aromatic part of their structure.

Organic matter investigation in agricultural Apennine topsoils (Emilia-Romagna Region): carbon pools and isotopic C signature

2020 ◽  
Author(s):  
Enrico Mistri ◽  
Gianluca Bianchini ◽  
Claudio Natali ◽  
Livia Vittori Antisari ◽  
Gloria Falsone ◽  
...  
Keyword(s):  
Organic Matter ◽  
Humic Acids ◽  
Crop Yields ◽  
Agricultural Soils ◽  
Total Carbon ◽  
Organic C ◽  
Soil C ◽  
Rural Development Programme ◽  
Isotopic Analyses ◽  
Emilia Romagna Region

&lt;p&gt;The exploitation of soils due to farming has produced a progressive loss of soil organic matter (SOM) over the years. At the same time, the degradation of SOM has led to a decline of several ecosystem services provided by soil, especially in mountain. Against this background, the partnership between Department of Physics and Earth Sciences of University of Ferrara and Department of Agricultural and Food Sciences of University of Bologna led to the creation of the SaveSOC2 project (Save Soil Organic Carbon), funded by Rural Development Programme of Emilia-Romagna Region. This project primarily seeks to investigate and promote carbon storage processes in agricultural soils of Emilia-Romagna Region (NE Italy). The present study outlines an overview about the SOM dynamics of &amp;#8220;I Rodi&amp;#8221; organic farm, located in the Modena Apennine. &amp;#8220;I Rodi&amp;#8221; produces and processes small organic fruits, especially raspberries. Three different sites (grassland -G, very low productive raspberries -LR, and good productive raspberries -GR) have been selected and the topsoils (0-15 cm and 15-30 cm) have been investigated. Elemental and isotopic analyses of soil C were performed using an EA-IRMS. In particular, the application of the Thermally Based Separation protocol [1] allowed the determination of both inorganic (IC) and organic (OC) carbon contents in each soil sample. OC accounted for 93.50% of the total carbon (1.72-4.84 wt.%). The negative &amp;#948;&lt;sup&gt;13&lt;/sup&gt;C values of the total carbon (from -27.8 to -19.7 &amp;#8240;) confirmed the predominance of OC over IC in the investigated soils. The average values of OC isotopic C signature showed a decreasing trend among the three sites (-28.2, -27.2 and -25.8&amp;#8240; for GR, G and LR, respectively), with the low productivity site having the highest &amp;#948;&lt;sup&gt;13&lt;/sup&gt;C value. The isotopic C signature of separated organic C fractions (0-15 cm topsoils) showed that humin (832-879 g/kg), which is the SOM fraction mostly interacting with the soil mineral phase and the largest pool, confirmed the observed trend (-27.5, -27.0, -26.4&amp;#8240;, GR, G and LR). The humic acids (6-17 g/kg) showed similar trend but lower &amp;#948;&lt;sup&gt;13&lt;/sup&gt;C values in all sites (-28.5, -28.0, -26.8 &amp;#8240;, GR, G and LR). Finally, fulvic acids (5-10 g/kg) differed, having dissimilar trend and values of &amp;#948;&lt;sup&gt;13&lt;/sup&gt;C (-27.1, -26.8, -26.0 &amp;#8240; for G, GR and LR). Comparing to G, the GR data suggested that organic management i) did not decrease quantity and quality of organic matter, and ii) it was more efficient in OC stabilisation, increasing the amount of less transformed OC in both humin and humic acids (more negative &amp;#948;&lt;sup&gt;13&lt;/sup&gt;C values). In the LR site, instead, the observed trend can be due to low suitability of this soil to raspberries production, negatively affecting both crop yields and organic C dynamics. In our opinion, in order to combine agricultural productivity and its sustainability, more attention should be paid both to soil management and suitability in the area.&lt;/p&gt;&lt;p&gt;[1] Natali C., Bianchini G., Vittori Antisari L. 2018. Thermal separation coupled with elemental and isotopic analysis: A method for soil carbon characterisation. Catena 164, 150-157.&lt;/p&gt;

PHOSPHATASE ACTIVITY OF SOILS AS INFLUENCED BY LIME AND OTHER TREATMENTS

1964 ◽  
Vol 44 (1) ◽  
pp. 137-144 ◽  
Author(s):  
R. L. Halstead
Keyword(s):  
Organic Matter ◽  
Phosphatase Activity ◽  
Mineral Soil ◽  
Organic Matter Content ◽  
Clay Content ◽  
Matter Content ◽  
Total Carbon ◽  
Appreciable Effect ◽  
Total Carbon Content ◽  
Mineral Soils

In laboratory incubation experiments liming with Ca(OH)2, CaCO3, or MgCO3 inhibited the phosphatase enzyme activity as measured by determination of phenol or phosphorus released from disodium phenyl phosphate. Chloride and sulphate salts of calcium and magnesium had no appreciable effect on the measured activity. Incubation for 9 months reduced the activity in a group of acid soils but not in a group of nearly neutral soils. Addition of phosphate prior to incubation had no effect on activity in either group.In buffer systems with the pH controlled over the range pH 2.0 to 11.0, activity in samples of an acid mineral soil increased gradually from pH 2.0 to a maximum at about pH 7.0, and then declined rapidly. The occurrence of peaks of optimum activity at pH 5.0 and 9.5 indicated the presence of both acid and alkaline phosphatases in an organic soil.Although there was no significant relationship between phosphatase activity and pH, clay content, nitrogen, and total carbon content of 10 mineral soils, there was a higher activity associated with higher organic matter content in three groups of soils with 3.2, 24.8, and 80.2% organic matter. Initial phosphatase activity of a group of mineral soils was not related to the degree of mineralization of organic soil phosphorus found to occur during an incubation period.

scholarly journals Earthworms act as biochemical reactors to convert labile plant compounds into stabilized soil microbial necromass

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Gerrit Angst ◽  
Carsten W. Mueller ◽  
Isabel Prater ◽  
Šárka Angst ◽  
Jan Frouz ◽  
...  
Keyword(s):  
Organic Matter ◽  
Carbon Sequestration ◽  
Soil Carbon ◽  
Conclusive Evidence ◽  
Total Carbon ◽  
Total Carbon Content ◽  
Soil Microbial ◽  
Biochemical Reactors ◽  
Stabilized Soil ◽  
Plant Compounds

AbstractEarthworms co-determine whether soil, as the largest terrestrial carbon reservoir, acts as source or sink for photosynthetically fixed CO2. However, conclusive evidence for their role in stabilising or destabilising soil carbon has not been fully established. Here, we demonstrate that earthworms function like biochemical reactors by converting labile plant compounds into microbial necromass in stabilised carbon pools without altering bulk measures, such as the total carbon content. We show that much of this microbial carbon is not associated with mineral surfaces and emphasise the functional importance of particulate organic matter for long-term carbon sequestration. Our findings suggest that while earthworms do not necessarily affect soil organic carbon stocks, they do increase the resilience of soil carbon to natural and anthropogenic disturbances. Our results have implications for climate change mitigation and challenge the assumption that mineral-associated organic matter is the only relevant pool for soil carbon sequestration.

scholarly journals Quantitative and Qualitative Composition of Soil Organic Matter in Samples of Ice Complex from Central Yakutia, Eastern Siberia

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Andrey Shepelev ◽  
Alexander Fedorov ◽  
Alexandra Cherepanova
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Active Layer ◽  
Organic Matter Content ◽  
Matter Content ◽  
Total Carbon ◽  
Biogenic Elements ◽  
Labile Organic Matter ◽  
Total Carbon Content ◽  
Ice Complex

Investigation of organic carbon and nitrogen stock was conducted at depths greater than one meter in the ice complex in central part of Yakutia (Russia). Around 53% of the total organic carbon stock in the upper part of the ice complex is held in the active layer. The protective layer holds 31% and the permafrost layer holds 16%. The distribution of nitrogen over the elementary layers of the ice complex mirrors the percentages for organic carbon stocks given above. The total stock of biogenic elements in the ice complex investigated (0–250 cm) consists of 38.7 ± 0.2 kg/m2 of organic carbon and 2.13 ± 0.01 kg/m2 of nitrogen. The prevalent amount is carbon detritus, 40% of the total carbon content in the active layer. The share of labile carbon accounts 18%, that is 2 times less than carbon detritus. In the next two layers, the content of the components decreases and varies from 2% to 12%. The low labile organic matter content in the protective and permafrost layers indicates the development of the ice complex proceeded under conditions with poorly formed organic material.

scholarly journals Stability and biodegradability of humic substances from Arctic soils of Western Siberia: insights from <sup>13</sup>C-NMR spectroscopy and elemental analysis

2015 ◽  
Vol 7 (4) ◽  
pp. 3021-3052 ◽  
Author(s):  
E. Ejarque ◽  
E. Abakumov
Keyword(s):  
Organic Matter ◽  
Nmr Spectroscopy ◽  
Western Siberia ◽  
13C Nmr Spectroscopy ◽  
Total Carbon ◽  
The Arctic ◽  
Total Carbon Content ◽  
Ambient Temperatures ◽  
Arctic Soils ◽  
Spatial Coverage

Abstract. Arctic soils contain large amounts of organic matter which, globally, exceed the amount of carbon stored in vegetation biomass and in the atmosphere. Recent studies emphasize the potential sensitivity for this soil organic matter (SOM) to be mineralised when faced with increasing ambient temperatures. In order to better refine the predictions about the response of SOM to climate warming, there is a need to increase the spatial coverage of empirical data on SOM quantity and quality in the Arctic area. This study provides, for the first time, a characterisation of SOM from the Gydan Peninsula in the Yamal Region, Western Siberia, Russia. On the one hand, soil humic acids and their humification state were characterised by measuring the elemental composition and diversity of functional groups using solid-state 13C-NMR spectroscopy. Also, the total mineralisable carbon was measured. Our results show that there is a uniformity of SOM characteristics throughout the studied region, as well as within soil profiles. Such in-depth homogeneity, together with a predominance of aliphatic carbon structures, suggests the accumulation in soil of raw and slightly decomposed organic matter. Moreover, results on total mineralisable carbon suggest a high lability of these compounds. The mineralisation rate was found to be independent of SOM quality, and to be mainly explained solely by the total carbon content. Overall, our results provide further evidence on the fundamental role that the soils of Western Siberia may have on regulating the global carbon balance when faced with increasing ambient temperatures.

scholarly journals Compartments of organic matter in an Oxisol under different types of no-tillage systems

2018 ◽  
Vol 39 (2) ◽  
pp. 533
Author(s):  
Roni Fernandes Guareschi ◽  
Marcos Gervasio Pereira ◽  
Paula Fernanda Chaves Soares ◽  
Fabiana Da Costa Barros ◽  
Adriano Perin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Climatic Conditions ◽  
Total Carbon ◽  
Control Treatment ◽  
No Tillage ◽  
Tillage Systems ◽  
Total Carbon Content ◽  
Soil C ◽  
Different Types ◽  
Tillage System

The objective of this study was to evaluate the changes in soil carbon (C) as well as its fractions of physical (particulate organic carbon associated with minerals), chemical (fulvic and humic acids and humins), and oxidizable (F1, F2, F3, and F4) forms of an Oxisol under no-tillage systems (SPD) under different successions and crop rotations in the Cerrado area. In order to do this, the areas of consolidated SPD (10 to 20 years) under the same soil and climatic conditions were selected in Montividiu (GO), with soybean-corn succession (SSM), soybean-millet succession (SSMt), soybean-millet-bean-cotton rotation (RSMFA), crop-livestock integration (ILP), and a native cerrado (CE) area used as a control treatment In each area, samples were collected at depths of 0.0-0.05, 0.05-0.10, 0.10-0.20, and 0.20-0.40 m, respectively. The no-tillage system with crop rotation, followed by no-tillage system with crop-livestock integration, were the ones that presented the greatest potential to increase total carbon content in soil, presenting higher C contents of the granulometric, humic, and oxidizable fractions of the soil organic matter (SOM), compared with the other areas of no-tillage systems with succession of the respective evaluated crops. The no-tillage areas with corn and soybean/millet succession systems showed a similar pattern in soil C accumulation, as well as in the compartments of SOM evaluated.

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