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Priming effect of (13)C-labelled wheat straw in no-tillage soil under drying and wetting cycles in the Loess Plateau of China.

Liu E, Wang J, Zhang Y, Angers DA, Yan C, Oweis T, He W, Liu Q, Chen B - Sci Rep (2015)

Bottom Line: The objectives of this study were to determine the effects of drying and wetting (DW) cycles on soil organic carbon (SOC) mineralisation and on the priming effect (PE) induced by the addition of (13)C-labelled wheat straw to long-term no-tillage (NT) and conventional-tillage (CT) soils.There was no significant effect of the tillage system on the SOC mineralisation rate or PE.Further research is needed to study the role of microbial communities and C pools in affecting the SOC mineralisation response to DW cycles.

View Article: PubMed Central - PubMed

Affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.

ABSTRACT
The objectives of this study were to determine the effects of drying and wetting (DW) cycles on soil organic carbon (SOC) mineralisation and on the priming effect (PE) induced by the addition of (13)C-labelled wheat straw to long-term no-tillage (NT) and conventional-tillage (CT) soils. We observed that the SOC mineralisation rate in rewetted soils was greater than that in soils that were kept at constant water content. The proportion of CO2 derived from the straw declined dramatically during the first 10 days. The priming direction was first positive, and then became slightly negative. The PE was higher under DW cycles than under constant water content. There was no significant effect of the tillage system on the SOC mineralisation rate or PE. The data indicate that the DW cycles had a significant effect on the SOC mineralisation rate and on the PE, demonstrating a positive combined effect between wheat straw and moisture fluctuations. Further research is needed to study the role of microbial communities and C pools in affecting the SOC mineralisation response to DW cycles.

No MeSH data available.


Related in: MedlinePlus

Rates of soil organic carbon (SOC) mineralisation for the no-tillage (NT) or conventional-tillage (CT) soils amended with (+S) or without (−S) wheat straw in the drying and wetting (DW) cycles or continuously wet (W) treatments.Values are expressed in mg of C-CO2 kg−1 of dried soil day−1. Error bars represent the standard error of the means (similarly hereinafter).
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f2: Rates of soil organic carbon (SOC) mineralisation for the no-tillage (NT) or conventional-tillage (CT) soils amended with (+S) or without (−S) wheat straw in the drying and wetting (DW) cycles or continuously wet (W) treatments.Values are expressed in mg of C-CO2 kg−1 of dried soil day−1. Error bars represent the standard error of the means (similarly hereinafter).

Mentions: After rewetting, the rate of SOC mineralisation in the DW cycle treatment was significantly (P < 0.01) greater than that in the continuously wet treatment (Fig. 2), with an average of 3.90 mg C-CO2 kg−1 soil day−1 during the whole incubation period. Additionally, the SOC mineralisation fluctuated greatly after the 5th cycle. In the continuously wet treatment, the rate of organic carbon mineralisation gradually decreased with incubation time: it sharply decreased on day two, moderately decreased for a period (2 d–50 d) and finally remained stable after day 51. During the incubation, the rate of SOC mineralisation varied alternatively between the CT soils and the NT soils, with an average of 9.97 and 7.71 mg C-CO2 kg−1 soil day−1 for the CT soils and 10.22 and 8.94 mg C-CO2 kg−1 soil day−1 for the NT soils under DW cycles and continuously wet treatments, respectively, with no significant (P > 0.05) difference.


Priming effect of (13)C-labelled wheat straw in no-tillage soil under drying and wetting cycles in the Loess Plateau of China.

Liu E, Wang J, Zhang Y, Angers DA, Yan C, Oweis T, He W, Liu Q, Chen B - Sci Rep (2015)

Rates of soil organic carbon (SOC) mineralisation for the no-tillage (NT) or conventional-tillage (CT) soils amended with (+S) or without (−S) wheat straw in the drying and wetting (DW) cycles or continuously wet (W) treatments.Values are expressed in mg of C-CO2 kg−1 of dried soil day−1. Error bars represent the standard error of the means (similarly hereinafter).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4561916&req=5

f2: Rates of soil organic carbon (SOC) mineralisation for the no-tillage (NT) or conventional-tillage (CT) soils amended with (+S) or without (−S) wheat straw in the drying and wetting (DW) cycles or continuously wet (W) treatments.Values are expressed in mg of C-CO2 kg−1 of dried soil day−1. Error bars represent the standard error of the means (similarly hereinafter).
Mentions: After rewetting, the rate of SOC mineralisation in the DW cycle treatment was significantly (P < 0.01) greater than that in the continuously wet treatment (Fig. 2), with an average of 3.90 mg C-CO2 kg−1 soil day−1 during the whole incubation period. Additionally, the SOC mineralisation fluctuated greatly after the 5th cycle. In the continuously wet treatment, the rate of organic carbon mineralisation gradually decreased with incubation time: it sharply decreased on day two, moderately decreased for a period (2 d–50 d) and finally remained stable after day 51. During the incubation, the rate of SOC mineralisation varied alternatively between the CT soils and the NT soils, with an average of 9.97 and 7.71 mg C-CO2 kg−1 soil day−1 for the CT soils and 10.22 and 8.94 mg C-CO2 kg−1 soil day−1 for the NT soils under DW cycles and continuously wet treatments, respectively, with no significant (P > 0.05) difference.

Bottom Line: The objectives of this study were to determine the effects of drying and wetting (DW) cycles on soil organic carbon (SOC) mineralisation and on the priming effect (PE) induced by the addition of (13)C-labelled wheat straw to long-term no-tillage (NT) and conventional-tillage (CT) soils.There was no significant effect of the tillage system on the SOC mineralisation rate or PE.Further research is needed to study the role of microbial communities and C pools in affecting the SOC mineralisation response to DW cycles.

View Article: PubMed Central - PubMed

Affiliation: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China.

ABSTRACT
The objectives of this study were to determine the effects of drying and wetting (DW) cycles on soil organic carbon (SOC) mineralisation and on the priming effect (PE) induced by the addition of (13)C-labelled wheat straw to long-term no-tillage (NT) and conventional-tillage (CT) soils. We observed that the SOC mineralisation rate in rewetted soils was greater than that in soils that were kept at constant water content. The proportion of CO2 derived from the straw declined dramatically during the first 10 days. The priming direction was first positive, and then became slightly negative. The PE was higher under DW cycles than under constant water content. There was no significant effect of the tillage system on the SOC mineralisation rate or PE. The data indicate that the DW cycles had a significant effect on the SOC mineralisation rate and on the PE, demonstrating a positive combined effect between wheat straw and moisture fluctuations. Further research is needed to study the role of microbial communities and C pools in affecting the SOC mineralisation response to DW cycles.

No MeSH data available.


Related in: MedlinePlus