Limits...
Greenhouse gas flux and crop productivity after 10 years of reduced and no tillage in a wheat-maize cropping system.

Tian S, Wang Y, Ning T, Zhao H, Wang B, Li N, Li Z, Chi S - PLoS ONE (2013)

Bottom Line: The objective of this study was to evaluate the emission characteristics of GHG (CH4 and N2O) under four reduced tillage systems from October 2007 to August 2009 based on a 10-yr tillage experiment in the North China Plain, which included no-tillage (NT) and three reduced tillage systems of subsoil tillage (ST), harrow tillage (HT) and rotary tillage (RT), with the conventional tillage (CT) as the control.The soil temperature positive impacted on the CH4 absorption by the soils of different tillage systems, while a significant negative correlation was observed between the absorption and soil moisture.Moreover, they also gained 33.73, 34.63, 32.62, 34.56 and 27.54 t ha(-1) yields during two crop-rotation periods, respectively.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, Shandong, China.

ABSTRACT
Appropriate tillage plays an important role in mitigating the emissions of greenhouse gases (GHG) in regions with higher crop yields, but the emission situations of some reduced tillage systems such as subsoiling, harrow tillage and rotary tillage are not comprehensively studied. The objective of this study was to evaluate the emission characteristics of GHG (CH4 and N2O) under four reduced tillage systems from October 2007 to August 2009 based on a 10-yr tillage experiment in the North China Plain, which included no-tillage (NT) and three reduced tillage systems of subsoil tillage (ST), harrow tillage (HT) and rotary tillage (RT), with the conventional tillage (CT) as the control. The soil under the five tillage systems was an absorption sink for CH4 and an emission source for N2O. The soil temperature positive impacted on the CH4 absorption by the soils of different tillage systems, while a significant negative correlation was observed between the absorption and soil moisture. The main driving factor for increased N2O emission was not the soil temperature but the soil moisture and the content of nitrate. In the two rotation cycle of wheat-maize system (10/2007-10/2008 and 10/2008-10/2009), averaged cumulative uptake fluxes of CH4 under CT, ST, HT, RT and NT systems were approximately 1.67, 1.72, 1.63, 1.77 and 1.17 t ha(-1) year(-1), respectively, and meanwhile, approximately 4.43, 4.38, 4.47, 4.30 and 4.61 t ha(-1) year(-1) of N2O were emitted from soil of these systems, respectively. Moreover, they also gained 33.73, 34.63, 32.62, 34.56 and 27.54 t ha(-1) yields during two crop-rotation periods, respectively. Based on these comparisons, the rotary tillage and subsoiling mitigated the emissions of CH4 and N2O as well as improving crop productivity of a wheat-maize cropping system.

Show MeSH

Related in: MedlinePlus

The diurnal flux variations of CH4 uptake (a) and N2O emission (b) in the CT and NT treatments.The data were collected from 2nd to 4th of May at 2-hour intervals in 2009. The data are means ± SD (n = 3).
© Copyright Policy
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3760911&req=5

pone-0073450-g004: The diurnal flux variations of CH4 uptake (a) and N2O emission (b) in the CT and NT treatments.The data were collected from 2nd to 4th of May at 2-hour intervals in 2009. The data are means ± SD (n = 3).

Mentions: The diurnal flux variations of CH4 uptake and N2O emission significantly differed between the CT and NT treatments (Figure 4). In both of the treatments, the CH4 uptake exhibited the lowest and highest fluxes at 6 a.m. and 2 p.m., respectively, but the lowest and highest values of CH4 absorption were 12.99 and 23.77 µg m−2 h−1, respectively, under CT and 12.23 and 23.03 µg m−2 h−1, respectively, under NT (Figure 4a). The emission troughs and peaks of N2O under CT and NT were observed at 4 a.m. and 4 p.m., respectively, with flux values of 16.90 and 41.89 µg m−2 h−1 under CT and 13.57 and 34.38 µg m−2 h−1 under NT, respectively (Figure 4b).


Greenhouse gas flux and crop productivity after 10 years of reduced and no tillage in a wheat-maize cropping system.

Tian S, Wang Y, Ning T, Zhao H, Wang B, Li N, Li Z, Chi S - PLoS ONE (2013)

The diurnal flux variations of CH4 uptake (a) and N2O emission (b) in the CT and NT treatments.The data were collected from 2nd to 4th of May at 2-hour intervals in 2009. The data are means ± SD (n = 3).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3760911&req=5

pone-0073450-g004: The diurnal flux variations of CH4 uptake (a) and N2O emission (b) in the CT and NT treatments.The data were collected from 2nd to 4th of May at 2-hour intervals in 2009. The data are means ± SD (n = 3).
Mentions: The diurnal flux variations of CH4 uptake and N2O emission significantly differed between the CT and NT treatments (Figure 4). In both of the treatments, the CH4 uptake exhibited the lowest and highest fluxes at 6 a.m. and 2 p.m., respectively, but the lowest and highest values of CH4 absorption were 12.99 and 23.77 µg m−2 h−1, respectively, under CT and 12.23 and 23.03 µg m−2 h−1, respectively, under NT (Figure 4a). The emission troughs and peaks of N2O under CT and NT were observed at 4 a.m. and 4 p.m., respectively, with flux values of 16.90 and 41.89 µg m−2 h−1 under CT and 13.57 and 34.38 µg m−2 h−1 under NT, respectively (Figure 4b).

Bottom Line: The objective of this study was to evaluate the emission characteristics of GHG (CH4 and N2O) under four reduced tillage systems from October 2007 to August 2009 based on a 10-yr tillage experiment in the North China Plain, which included no-tillage (NT) and three reduced tillage systems of subsoil tillage (ST), harrow tillage (HT) and rotary tillage (RT), with the conventional tillage (CT) as the control.The soil temperature positive impacted on the CH4 absorption by the soils of different tillage systems, while a significant negative correlation was observed between the absorption and soil moisture.Moreover, they also gained 33.73, 34.63, 32.62, 34.56 and 27.54 t ha(-1) yields during two crop-rotation periods, respectively.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, Shandong, China.

ABSTRACT
Appropriate tillage plays an important role in mitigating the emissions of greenhouse gases (GHG) in regions with higher crop yields, but the emission situations of some reduced tillage systems such as subsoiling, harrow tillage and rotary tillage are not comprehensively studied. The objective of this study was to evaluate the emission characteristics of GHG (CH4 and N2O) under four reduced tillage systems from October 2007 to August 2009 based on a 10-yr tillage experiment in the North China Plain, which included no-tillage (NT) and three reduced tillage systems of subsoil tillage (ST), harrow tillage (HT) and rotary tillage (RT), with the conventional tillage (CT) as the control. The soil under the five tillage systems was an absorption sink for CH4 and an emission source for N2O. The soil temperature positive impacted on the CH4 absorption by the soils of different tillage systems, while a significant negative correlation was observed between the absorption and soil moisture. The main driving factor for increased N2O emission was not the soil temperature but the soil moisture and the content of nitrate. In the two rotation cycle of wheat-maize system (10/2007-10/2008 and 10/2008-10/2009), averaged cumulative uptake fluxes of CH4 under CT, ST, HT, RT and NT systems were approximately 1.67, 1.72, 1.63, 1.77 and 1.17 t ha(-1) year(-1), respectively, and meanwhile, approximately 4.43, 4.38, 4.47, 4.30 and 4.61 t ha(-1) year(-1) of N2O were emitted from soil of these systems, respectively. Moreover, they also gained 33.73, 34.63, 32.62, 34.56 and 27.54 t ha(-1) yields during two crop-rotation periods, respectively. Based on these comparisons, the rotary tillage and subsoiling mitigated the emissions of CH4 and N2O as well as improving crop productivity of a wheat-maize cropping system.

Show MeSH
Related in: MedlinePlus