scholarly journals Simulation and validation of long-term changes in soil organic carbon under permanent grassland using the DNDC model

Geoderma ◽  
2020 ◽  
Vol 361 ◽  
pp. 114014 ◽  
Author(s):  
M.I. Khalil ◽  
D.A. Fornara ◽  
B. Osborne
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Dndc Model ◽  
Permanent Grassland ◽  
Long Term Changes ◽  
Simulation And Validation

Simulating trends in soil organic carbon in long-term experiments using the DNDC model

Geoderma ◽  
1997 ◽  
Vol 81 (1-2) ◽  
pp. 45-60 ◽  
Author(s):  
Changsheng Li ◽  
Steve Frolking ◽  
Graham J. Crocker ◽  
Peter R. Grace ◽  
Jan Klír ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Dndc Model ◽  
Long Term Experiments

Sequestration of carbon and changes in soil quality under conservation tillage on light-textured soils in Australia: a review

2003 ◽  
Vol 43 (4) ◽  
pp. 325 ◽  
Author(s):  
K. Y. Chan ◽  
D. P. Heenan ◽  
H. B. So
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Quality ◽  
Soil Structure ◽  
Conservation Tillage ◽  
Conventional Tillage ◽  
Continuous Cropping ◽  
Ecological Zones ◽  
Long Term Changes

Light-textured soils (<35% clay) make up more than 80%, by area, of cropping soils in Australia. Many have inherent soil physical problems, e.g. hardsetting, sodicity and low organic carbon levels. Maintenance and improvement of soil organic carbon levels are crucial to preserving the soil structure and physical fertility of these soils.A review of field trials on conservation tillage (3–19 years duration) on these soils in southern Australia revealed that significantly higher soil organic carbon levels compared with conventional tillage were found only in the wetter areas (>500 mm) and the differences were restricted to the top 2.5–10.0 cm. The average magnitude of the difference was lower than that reported in the USA. The lack of a positive response to conservation tillage is probably a reflection of a number of factors, namely low crop yield (due to low rainfall), partial removal of stubble by grazing and the high decomposition rate (due to the high temperature). There is evidence suggesting that under continuous cropping in the drier areas, the soil organic carbon level continues to decline, even under conservation tillage.Better soil structure and soil physical properties, namely macro-porosity, aggregate stability and higher infiltration have been reported under conservation tillage when compared with conventional tillage. However, little information on long-term changes of these properties under conservation tillage is available. As many of these soil qualities are associated directly or indirectly with soil organic carbon levels, the lack of significant increase in the latter suggests that many of these improvements may not be sustainable in the longer term, particularly in the drier areas. Continuous monitoring of long-term changes in the soil organic carbon and soil quality under conservation tillage in different agro-ecological zones is needed.

Long-Term Changes in Soil Organic Carbon and Nitrogen under Semiarid Tillage and Cropping Practices

2015 ◽  
Vol 79 (6) ◽  
pp. 1771-1781 ◽  
Author(s):  
Robert C. Schwartz ◽  
R. Louis Baumhardt ◽  
Bridget R. Scanlon ◽  
Jourdan M. Bell ◽  
Ronald G. Davis ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Carbon And Nitrogen ◽  
Cropping Practices ◽  
Long Term Changes

scholarly journals Effect of Long-Term Soil Management Practices on Tree Growth, Yield and Soil Biodiversity in a High-Density Olive Agro-Ecosystem

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1036
Author(s):  
Sauro Simoni ◽  
Giovanni Caruso ◽  
Nadia Vignozzi ◽  
Riccardo Gucci ◽  
Giuseppe Valboa ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Structure ◽  
Soil Management ◽  
Carbon Pools ◽  
Grass Cover ◽  
Soil Biodiversity ◽  
Canopy Effect ◽  
Soil Organic Carbon Pools

Edaphic arthropod communities provide valuable information about the prevailing status of soil quality to improve the functionality and long-term sustainability of soil management. The study aimed at evaluating the effect of plant and grass cover on the functional biodiversity and soil characteristics in a mature olive orchard (Olea europaea L.) managed for ten years by two conservation soil managements: natural grass cover (NC) and conservation tillage (CT). The trees under CT grew and yielded more than those under NC during the period of increasing yields (years 4–7) but not when they reached full production. Soil management did not affect the tree root density. Collecting samples underneath the canopy (UC) and in the inter-row space (IR), the edaphic environment was characterized by soil structure, hydrological properties, the concentration and storage of soil organic carbon pools and the distribution of microarthropod communities. The soil organic carbon pools (total and humified) were negatively affected by minimum tillage in IR, but not UC, without a loss in fruit and oil yield. The assemblages of microarthropods benefited, firstly, from the grass cover, secondly, from the canopy effect, and thirdly, from a soil structure ensuring a high air capacity and water storage. Feeding functional groups—hemiedaphic macrosaprophages, polyphages and predators—resulted in selecting the ecotonal microenvironment between the surface and edaphic habitat.

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