Molecular characterization of soil organic carbon in water-stable aggregate fractions during the early pedogenesis from parent material of Mollisols

The study set out to determine changes in the soil air-water properties, the water-stable aggregate share and organic carbon content as effects of a five-year application of effective microorganisms (EM-A). The hypothesis that long-term applied EM-A biopreparations have a positive effect on the soil physical condition has not been confirmed. Haplic Luvisols originating from silt were studied in a field experiment after EM-A biopreparation treatment. The soil samples with the natural structure preserved intact were collected three times each year. The properties of the soil determined in the study were: particle density, total organic carbon content, bulk density, total porosity, air capacity, air permeability, soil moisture at sampling, field water capacity, available water content, unavailable water content, and water-stable aggregate content. The ratio of field water capacity and total porosity (FC/TP) was calculated. It was found that EM-A application primarily leads to a decrease in the content of organic carbon and water-stable aggregates. This was an adverse effect. Total organic carbon (TOC) and water-stable aggregates proved to be very sensitive indicators for assessing the soil physical condition. However, changes in soil compaction and air–water properties did not show significant deterioration. Our research addresses the data gaps about EM application to soil.

Download Full-text

Characterization of Soil Organic Carbon in Long‐Term Amendment Trials

Spectroscopy Letters ◽

10.1081/sl-200058704 ◽

2005 ◽

Vol 38 (3) ◽

pp. 283-291 ◽

Cited By ~ 9

Author(s):

O. Francioso ◽

S. Sánchez‐Cortés ◽

G. Corrado ◽

P. Gioacchini ◽

C. Ciavatta

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon

Download Full-text

Parent material and climate affect soil organic carbon fractions under pastures in south-eastern Australia

Soil Research ◽

10.1071/sr16305 ◽

2017 ◽

Vol 55 (8) ◽

pp. 799 ◽

Cited By ~ 9

Author(s):

Susan E. Orgill ◽

Jason R. Condon ◽

Mark K. Conyers ◽

Stephen G. Morris ◽

Brian W. Murphy ◽

...

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Parent Material ◽

Climatic Zone ◽

Annual Rainfall ◽

Carbon Fractions ◽

South Eastern ◽

Mean Annual Rainfall ◽

Eastern Australia ◽

South Eastern Australia

In the present field survey, 72 sites were sampled to assess the effect of climate (Monaro, Boorowa and Coleambally regions) and parent material (Monaro region only; basalt and granite) on soil organic carbon (OC) under perennial pastures. In the higher-rainfall zone (Monaro and Boorowa; >500mm mean annual rainfall), OC stocks under introduced and native perennial pastures were compared, whereas in the lower-rainfall zone (Coleambally; <500mm mean annual rainfall) OC stocks under crops and pastures were compared. Carbon fractions included total OC (TOC), particulate OC (POC), resistant OC (ROC) and humic OC (HUM). Higher OC stocks were associated with higher spring and summer rainfall and lower annual temperatures. Within a climatic zone, parent material affected the stock of OC fractions in the 0–30cm soil layer. Within a climatic zone, when grouped by parent material, there was no difference in OC stock with vegetation type. There were significant correlations between soil factors associated with parent material and OC concentration, including negative correlations between SiO2 and HUM (P<0.05) and positive correlations between cation exchange capacity and TOC, POC and ROC (P<0.01). TOC was also positively correlated with total nitrogen (N) and available sulfur (S; P<0.05), indicating organic matter in soil is important for N and S supply for plant production in the studied regions, and vice versa. Although ensuring adequate available S may increase OC stocks in south-eastern Australia, the large stock of OC in the soil under perennial pastures, and the dominating effect of climate and parent material on this stock, may mean that modest increases in soil OC due to management factors go undetected.

Download Full-text

Regional characterization of the long-term change in soil organic carbon under intensive agriculture

Soil Use and Management ◽

10.1111/j.1475-2743.1996.tb00964.x ◽

1996 ◽

Vol 12 (2) ◽

pp. 86-94 ◽

Cited By ~ 45

Author(s):

M. Van Meirvenne ◽

J. Pannier ◽

G. Hofman ◽

G. Louwagie

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Intensive Agriculture ◽

Term Change

Download Full-text

Changes in Soil Organic Carbon and Carbon Fractions Under Different Land Use and Management Practices After Development From Parent Material of Mollisols

Soil Science ◽

10.1097/ss.0000000000000059 ◽

2014 ◽

Vol 179 (4) ◽

pp. 205-210 ◽

Cited By ~ 4

Author(s):

Mengyang You ◽

Martin Burger ◽

Lujun Li ◽

Wenxiu Zou ◽

Na Li ◽

...

Keyword(s):

Land Use ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Management Practices ◽

Parent Material ◽

Carbon Fractions ◽

Land Use And Management

Download Full-text

Nitrogen addition increases the contents of glomalin-related soil protein and soil organic carbon but retains aggregate stability in a Pinus tabulaeformis forest

10.7287/peerj.preprints.26649v1 ◽

2018 ◽

Author(s):

Lipeng Sun ◽

Guoliang Wang ◽

Hang Jing ◽

Guobin Liu

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Geometric Mean ◽

Aggregate Stability ◽

Soil Aggregate ◽

Pinus Tabulaeformis ◽

N Addition ◽

Short Term ◽

Aggregate Fractions ◽

Soil Protein

Background: Glomalin-related soil protein (GRSP) and soil organic carbon (SOC) contribute to the formation and stability of soil aggregates, but the mechanism by which global atmospheric nitrogen (N) deposition changes soil aggregate stability when it alters the distribution of GRSP and SOC in different aggregate fractions remains unknown. Methods: We used a gradient N addition (0–9 g N–2 y–1) in Pinus tabulaeformis forest for 2 years in northeast China and then examined the changes in SOC contents, total GRSP (T-GRSP), and easily extractable GRSP (EE-GRSP) contents in three soil aggregate fractions (macro-aggregate: >250 μm, micro-aggregate: 250–53 μm, and clay–silt aggregate: <53 μm) and their relationship with aggregate stability. Results: (1) The soil was dominated by macro-aggregates. Short term N addition had no significant effect on mean weight diameter (MWD) and geometric mean diameter (GMD). (2) GRSP varied among aggregate fractions, and N addition had variable effects on the distribution of GRSP in aggregate fractions. The EE-GRSP content in the macro-aggregates increased initially and then decreased with increasing N addition levels, having a peak value of 0.480 mg/g at 6 g N–2 y–1. The micro-aggregates had the lowest EE-GRSP content (0.148 mg/g) at 6 g N–2 y–1. Furthermore, the T-GRSP content significantly increased in the aggregate fractions with the N addition levels. (3) The macro-aggregate had the highest SOC content, followed by the micro-aggregate and the clay–silt aggregate had the lowest SOC content. N addition significantly increased the SOC content in all the aggregate fractions. (4) GRSP and SOC contents were not significantly correlated with MWD. Conclusion: The distributions of GRSP and SOC varied with aggregate fractions. GRSP and SOC contents increased by N addition, but this increase did not enhance aggregate stability in short term, and the improvement of stability might depend on binding agents and incubation time.

Download Full-text