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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

Priming effect (PE) intensity for 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) treatments.Values are expressed in mg of C-CO2 kg−1 of dried soil day−1.
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f4: Priming effect (PE) intensity for 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) treatments.Values are expressed in mg of C-CO2 kg−1 of dried soil day−1.

Mentions: The PE intensity gradually decreased with the incubation time and acted first positively and then slightly negatively under the DW cycles and continuously wet treatments (Fig. 4). A negative PE occurred after 31 d in the continuously wet treatment and after 91 d in the DW cycles. The PE intensity of the no-tillage and conventional-tillage soils in the DW cycles was greater than that in the continuously wet treatment, with an average of 1.71 and 3.58 mg C-CO2 kg−1 soil day−1 respectively. Specifically, the difference in the PE between the DW cycles the and constant moisture conditions for 11 d–71 d was significant (P < 0.05); this difference was not significant (P > 0.05) after 91 d. In contrast with the soils without straw input in the continuously wet treatment, the DW cycles and straw together significantly increased the rate of SOC mineralisation demonstrating a positive combined effect. In the first five DW cycles and during the first 11 days in the continuously wet treatment, the straw had a greater influence on the rate of SOC mineralisation than did the DW cycles by 3.45 and 4.01 mg C kg−1 soil day−1, respectively; subsequently, the straw had less influence by 5.88 and 3.82 mg C kg−1 soil day−1, respectively (Figs 2 and 4). During the incubation period, the differences in PE between the conventional-tillage (CT) soils and the NT soils were not significant (P > 0.05), but the interaction between the water condition and soil tillage management was 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)

Priming effect (PE) intensity for 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) treatments.Values are expressed in mg of C-CO2 kg−1 of dried soil day−1.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: Priming effect (PE) intensity for 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) treatments.Values are expressed in mg of C-CO2 kg−1 of dried soil day−1.
Mentions: The PE intensity gradually decreased with the incubation time and acted first positively and then slightly negatively under the DW cycles and continuously wet treatments (Fig. 4). A negative PE occurred after 31 d in the continuously wet treatment and after 91 d in the DW cycles. The PE intensity of the no-tillage and conventional-tillage soils in the DW cycles was greater than that in the continuously wet treatment, with an average of 1.71 and 3.58 mg C-CO2 kg−1 soil day−1 respectively. Specifically, the difference in the PE between the DW cycles the and constant moisture conditions for 11 d–71 d was significant (P < 0.05); this difference was not significant (P > 0.05) after 91 d. In contrast with the soils without straw input in the continuously wet treatment, the DW cycles and straw together significantly increased the rate of SOC mineralisation demonstrating a positive combined effect. In the first five DW cycles and during the first 11 days in the continuously wet treatment, the straw had a greater influence on the rate of SOC mineralisation than did the DW cycles by 3.45 and 4.01 mg C kg−1 soil day−1, respectively; subsequently, the straw had less influence by 5.88 and 3.82 mg C kg−1 soil day−1, respectively (Figs 2 and 4). During the incubation period, the differences in PE between the conventional-tillage (CT) soils and the NT soils were not significant (P > 0.05), but the interaction between the water condition and soil tillage management was 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