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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

Proportion of CO2 from straw in the no-tillage (NT) or conventional-tillage (CT) soils amended with winter wheat straw in the drying and wetting (DW) cycles or continuously wet (W) treatment.
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f3: Proportion of CO2 from straw in the no-tillage (NT) or conventional-tillage (CT) soils amended with winter wheat straw in the drying and wetting (DW) cycles or continuously wet (W) treatment.

Mentions: In the continuously wet treatment, the proportion of CO2 from the straw in the soils that were amended with straw first increased and then decreased, while in the DW cycles, it decreased gradually (Fig. 3). In the DW cycles, the proportion for the NT was greater than that of the CT, with no significant difference (P > 0.05). In the early stage of incubation (before 71 d), the mean proportion of CO2 from straw for the NT was only 3.72% greater than that of the CT in the continuously wet treatment, while in the later stage (91 d–111 d), the results were reversed, still with no significant difference (P > 0.05). From the rewetting day, the proportion of CO2 from the straw varied from 44% to 34% in the continuously wet treatment and was significantly (P < 0.001) greater than that in the DW cycles which varied from 33% to 13%. The interaction effects between the water condition and soil tillage management were not statistically significant (P > 0.05).


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)

Proportion of CO2 from straw in the no-tillage (NT) or conventional-tillage (CT) soils amended with winter wheat straw in the drying and wetting (DW) cycles or continuously wet (W) treatment.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Proportion of CO2 from straw in the no-tillage (NT) or conventional-tillage (CT) soils amended with winter wheat straw in the drying and wetting (DW) cycles or continuously wet (W) treatment.
Mentions: In the continuously wet treatment, the proportion of CO2 from the straw in the soils that were amended with straw first increased and then decreased, while in the DW cycles, it decreased gradually (Fig. 3). In the DW cycles, the proportion for the NT was greater than that of the CT, with no significant difference (P > 0.05). In the early stage of incubation (before 71 d), the mean proportion of CO2 from straw for the NT was only 3.72% greater than that of the CT in the continuously wet treatment, while in the later stage (91 d–111 d), the results were reversed, still with no significant difference (P > 0.05). From the rewetting day, the proportion of CO2 from the straw varied from 44% to 34% in the continuously wet treatment and was significantly (P < 0.001) greater than that in the DW cycles which varied from 33% to 13%. The interaction effects between the water condition and soil tillage management were not statistically significant (P > 0.05).

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