Soil carbon change and its responses to agricultural practices in Australian agro-ecosystems: A review and synthesis

Luo, Zhongkui; Wang, Enli; Sun, Osbert Jianxin

doi:10.1016/j.geoderma.2009.12.012

Cited by 352 publications

(210 citation statements)

References 173 publications

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“…This rate of potential for accumulation of SOC through land-management practices that maximise conversion of rainfall to net primary production (i.e. 100% WUE) and preserve existing SOM is similar to that estimated for Australia (0.35 t C/ha.year; Luo et al 2010). …”

Section: Discussionsupporting

confidence: 76%

Capacity for increasing soil organic carbon stocks in dryland agricultural systems

et al. 2013

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Abstract. Assessment of the potential for soil carbon sequestration based on soil type, land use, and climate scenarios is crucial for determining which agricultural regions can be used to help mitigate increasing atmospheric CO 2 concentrations. In semi-arid and Mediterranean-type environments, soil organic carbon (SOC) storage capacity is rarely achieved under dryland agricultural systems. We aimed to assess both actual (measured) and attainable (modelled) SOC stock values for the dryland agricultural production zone of Western Australia. We measured actual SOC storage (0-0.3 m) and known constraints to plant growth for a range of soils types (3-27% clay) and land uses (continuous cropping, mixed cropping, annual and perennial pastures) on the Albany sand plain in Western Australia (n = 261 sites), spanning a rainfall gradient of 421-747 mm. Average actual SOC stocks for land use-soil type combinations ranged from 33 to 128 t C/ha (0-0.3 m). Up to 89% of the variability in actual SOC stock was explained by soil depth, rainfall, land use, and soil type. The scenarios modelled with Roth-C predicted that attainable SOC values of 59-140 t C/ha (0-0.3 m) could be achieved within 100 years. This indicated an additional storage capacity of 5-45% (7-27 t C/ha) depending on the specific land use-soil type combination. However, actual SOC in the surface 0-0.1 m was 95 to >100% of modelled attainable SOC values, suggesting this soil depth was 'saturated'. Our findings highlight that additional SOC storage capacity in this region is limited to the subsoil below 0.1 m. This has implications for management strategies to increase SOC sequestration in dryland agricultural systems, as current practices tend to concentrate organic matter near the soil surface.

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Section: Discussionsupporting

confidence: 76%

Capacity for increasing soil organic carbon stocks in dryland agricultural systems

et al. 2013

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“…Soil organic matter (SOM)-that represents the major contributor of aquatic OM in most freshwater ecosystems (Aitkenhead-Peterson et al 2003)-is highly sensitive to land use changes (Butman et al 2015). Several soil management practices such as tillage or organic fertilizer application are known to stimulate the microbial decomposition of SOM (Luo et al 2010;McLauchlan 2006;Pisani et al 2016). Beyond their role as decomposers, microorganisms are a ubiquitous source of OM to soils through recycling of plant and animal-derived OM and synthesis of new products (Dungait et al 2012;Gleixner 2013;Miltner et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

et al. 2017

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The impact of human activities on the concentrations and composition of dissolved organic matter (DOM) and particulate organic matter (POM) was investigated in the Walloon Region of the Meuse River basin (Belgium). Water samples were collected at different hydrological periods along a gradient of human disturbance (50 sampling sites ranging from 8.0 to 20,407 km 2 ) and during a 1.5 year monitoring of the Meuse River at the city of Liège. This dataset was completed by the characterization of the DOM pool in groundwaters. The composition of DOM and POM was investigated through elemental (C:N ratios), isotopic (d 13 C) and optical measurements including excitation emission matrix fluorescence with parallel factor analysis (EEM-PARAFAC). Land use was a major driver on fluvial OM composition at the regional scale of the Meuse Basin, the composition of both fluvial DOM and POM pools showing a shift toward a more microbial/algal and less plant/soil-derived character as human disturbance increased. The comparison of DOM composition between surface and groundwaters demonstrated that this pattern can be attributed in part to the transformation of terrestrial sources by agricultural practices that promote the decomposition of soil organic matter in agricultural lands and subsequent microbial inputs in terrestrial sources. In parallel, human land had contrasting effects on the autochthonous production of DOM and POM. While the in-stream generation of fresh DOM through biological activity was promoted in urban areas, summer autochthonous POM production was not influenced by land use. Finally, soil erosion by agricultural management practices favored the transfer of terrestrial organic matter via the particulate phase. Stable isotope data suggest that the hydrological transfer of terrestrial DOM and POM in humanimpacted catchment are not subject to the same controls, and that physical exchange between these two pools of organic matter is limited.

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“…Among them 42% respondent followed cropping pattern for improving soil health, 31% followed cropping pattern for profit, 21% respondent followed cropping pattern for destroying certain pest infestation and rest of the 6% followed crop rotation for other objective ( Fig 4). A recent study by Luo et al (2010) reviewed conservation agricultural practices (such as rotation cropping, conservation tillage and stubble retention and irrigation/fertilization) and found that increasing the crop frequency and perenniality and a combination of stubble retention and conservation tillage where the main drivers for SOC accumulation. (Table 3).…”

Section: Fig 3 Distribution Of Respondents According To Reason Of Tmentioning

confidence: 99%

Analysis of Farmers’ Perception and Decision on Soil Management in Relation to Climate Change

Hossen

Mozumder

Islam

2015

J. Environ. Sci. & Natural Resources

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In Bangladesh, agriculture play an important role in sector of the economy and it is highly dependent on climate. The present study was conducted to assess farmer's perception on climate change and soil carbon sequestration (SCS) in the Ludhua village under Senbagh upazilla of Noakhali district during November 2012 to February 2013. The study consisted of 94 randomly selected farmers. It was observed that nearly about 77% respondent realized change in climate and 23% respondent found no variation in climate; among them 69.5% respondent claimed temperature is increasing. About 55.1% respondent believed man made activity responsible for extreme event (i.e. flood, cyclone, drought etc) while 38.5% respondent believed nature is the responsible for extreme event. Most of the respondent (94.7%) found organic farming improves soil health. Crop residues are important source of soil organic matter which captures soil carbon by the formation of humus. About 86.1% respondent had concept about crop residue. Majority of the farmer (53.2%) claimed that composting increase soil organic matter. Conservation agriculture like crop rotation, cropping pattern, conservation, tillage and stubble retention irrigation and fertilization are the main drivers for SCS. Although most of the (57.2%) farmers had no idea about soil carbon and SCS but they followed various soils management practices for better crop yield (crop rotation 90.3%, irrigation 98.96% and fertilization 96.8%) which helps to increase soil organic carbon.

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Soil carbon change and its responses to agricultural practices in Australian agro-ecosystems: A review and synthesis

Cited by 352 publications

References 173 publications

Capacity for increasing soil organic carbon stocks in dryland agricultural systems

Capacity for increasing soil organic carbon stocks in dryland agricultural systems

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

Analysis of Farmers’ Perception and Decision on Soil Management in Relation to Climate Change

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