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Warmer and Wetter Soil Stimulates Assimilation More than Respiration in Rainfed Agricultural Ecosystem on the China Loess Plateau: The Role of Partial Plastic Film Mulching Tillage.

Gong D, Hao W, Mei X, Gao X, Liu Q, Caylor K - PLoS ONE (2015)

Bottom Line: MFR stimulated assimilation more than respiration during whole growing season, resulting in a higher carbon sequestration in terms of NEE of -79 gC/m2 than CK.However, after considering carbon in harvested grain (or aboveground biomass), there is a slight higher carbon sink (or a stronger carbon source) in MFR due to its greater difference of aboveground biomass than that of grain between both treatments.These results demonstrate that partial plastic film mulched furrow-ridge tillage with aboveground biomass exclusive of grain returned to the soil is an effective way to enhance simultaneously carbon sequestration and grain yield of maize in the semiarid regions.

View Article: PubMed Central - PubMed

Affiliation: State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation/MOA Key Laboratory for Dryland Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Science, Beijing, 100081, P.R. China.

ABSTRACT
Effects of agricultural practices on ecosystem carbon storage have acquired widespread concern due to its alleviation of rising atmospheric CO2 concentrations. Recently, combining of furrow-ridge with plastic film mulching in spring maize ecosystem was widely applied to boost crop water productivity in the semiarid regions of China. However, there is still limited information about the potentials for increased ecosystem carbon storage of this tillage method. The objective of this study was to quantify and contrast net carbon dioxide exchange, biomass accumulation and carbon budgets of maize (Zea maize L.) fields under the traditional non-mulching with flat tillage (CK) and partial plastic film mulching with furrow-ridge tillage (MFR) on the China Loess Plateau. Half-hourly net ecosystem CO2 exchange (NEE) of both treatments were synchronously measured with two eddy covariance systems during the growing seasons of 2011 through 2013. At same time green leaf area index (GLAI) and biomass were also measured biweekly. Compared with CK, the warmer and wetter (+1.3°C and +4.3%) top soil at MFR accelerated the rates of biomass accumulation, promoted greater green leaf area and thus shortened the growing seasons by an average value of 10.4 days for three years. MFR stimulated assimilation more than respiration during whole growing season, resulting in a higher carbon sequestration in terms of NEE of -79 gC/m2 than CK. However, after considering carbon in harvested grain (or aboveground biomass), there is a slight higher carbon sink (or a stronger carbon source) in MFR due to its greater difference of aboveground biomass than that of grain between both treatments. These results demonstrate that partial plastic film mulched furrow-ridge tillage with aboveground biomass exclusive of grain returned to the soil is an effective way to enhance simultaneously carbon sequestration and grain yield of maize in the semiarid regions.

No MeSH data available.


The relationships between dry biomass carbon and the sum of daily canopy assimilated carbon at different growing stages of 2011–2013.Unfilled and filled symbols represent CK and MFR data, respectively; triangle, square and circle represent 2011, 2012, and 2013, respectively. Dashed and solid lines represent the fitted curves for CK and MFR data, respectively.
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pone.0136578.g006: The relationships between dry biomass carbon and the sum of daily canopy assimilated carbon at different growing stages of 2011–2013.Unfilled and filled symbols represent CK and MFR data, respectively; triangle, square and circle represent 2011, 2012, and 2013, respectively. Dashed and solid lines represent the fitted curves for CK and MFR data, respectively.

Mentions: The relationships between biomass carbon and canopy assimilated carbon are plotted in Fig 6. There were significantly linear relationships between biomass carbon and canopy assimilated carbon for both treatments and three years. It showed that seasonal distributions of the daily crop gain of carbon estimated from measured NEE were correlated reasonably well with the total (above and belowground) biomass. The slopes of linear regression models were -1.03 and -1.15 for CK and MFR, respectively. The slopes of linear relationships should be theoretically less than 1.0 due to plant respiration, but in this study they were slighter greater than 1.0 because of underestimation of NEE from eddy covariance measurements. The result is consist with the Suyker et al. (2004) report on rainfed and irrigated maize in eastern Nebraska, USA [8]. At the same growing stages the integration of canopy assimilated carbon and the accumulative carbon in dry biomass were higher in the MFR treatment than those in the CK treatment. This phenomenon can be also explained by that warmer and wetter soil in the MFR treatment stimulates assimilation more than respiration, which resulted in greater biomass accumulation of the MFR than that of the CK.


Warmer and Wetter Soil Stimulates Assimilation More than Respiration in Rainfed Agricultural Ecosystem on the China Loess Plateau: The Role of Partial Plastic Film Mulching Tillage.

Gong D, Hao W, Mei X, Gao X, Liu Q, Caylor K - PLoS ONE (2015)

The relationships between dry biomass carbon and the sum of daily canopy assimilated carbon at different growing stages of 2011–2013.Unfilled and filled symbols represent CK and MFR data, respectively; triangle, square and circle represent 2011, 2012, and 2013, respectively. Dashed and solid lines represent the fitted curves for CK and MFR data, respectively.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4549313&req=5

pone.0136578.g006: The relationships between dry biomass carbon and the sum of daily canopy assimilated carbon at different growing stages of 2011–2013.Unfilled and filled symbols represent CK and MFR data, respectively; triangle, square and circle represent 2011, 2012, and 2013, respectively. Dashed and solid lines represent the fitted curves for CK and MFR data, respectively.
Mentions: The relationships between biomass carbon and canopy assimilated carbon are plotted in Fig 6. There were significantly linear relationships between biomass carbon and canopy assimilated carbon for both treatments and three years. It showed that seasonal distributions of the daily crop gain of carbon estimated from measured NEE were correlated reasonably well with the total (above and belowground) biomass. The slopes of linear regression models were -1.03 and -1.15 for CK and MFR, respectively. The slopes of linear relationships should be theoretically less than 1.0 due to plant respiration, but in this study they were slighter greater than 1.0 because of underestimation of NEE from eddy covariance measurements. The result is consist with the Suyker et al. (2004) report on rainfed and irrigated maize in eastern Nebraska, USA [8]. At the same growing stages the integration of canopy assimilated carbon and the accumulative carbon in dry biomass were higher in the MFR treatment than those in the CK treatment. This phenomenon can be also explained by that warmer and wetter soil in the MFR treatment stimulates assimilation more than respiration, which resulted in greater biomass accumulation of the MFR than that of the CK.

Bottom Line: MFR stimulated assimilation more than respiration during whole growing season, resulting in a higher carbon sequestration in terms of NEE of -79 gC/m2 than CK.However, after considering carbon in harvested grain (or aboveground biomass), there is a slight higher carbon sink (or a stronger carbon source) in MFR due to its greater difference of aboveground biomass than that of grain between both treatments.These results demonstrate that partial plastic film mulched furrow-ridge tillage with aboveground biomass exclusive of grain returned to the soil is an effective way to enhance simultaneously carbon sequestration and grain yield of maize in the semiarid regions.

View Article: PubMed Central - PubMed

Affiliation: State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation/MOA Key Laboratory for Dryland Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Science, Beijing, 100081, P.R. China.

ABSTRACT
Effects of agricultural practices on ecosystem carbon storage have acquired widespread concern due to its alleviation of rising atmospheric CO2 concentrations. Recently, combining of furrow-ridge with plastic film mulching in spring maize ecosystem was widely applied to boost crop water productivity in the semiarid regions of China. However, there is still limited information about the potentials for increased ecosystem carbon storage of this tillage method. The objective of this study was to quantify and contrast net carbon dioxide exchange, biomass accumulation and carbon budgets of maize (Zea maize L.) fields under the traditional non-mulching with flat tillage (CK) and partial plastic film mulching with furrow-ridge tillage (MFR) on the China Loess Plateau. Half-hourly net ecosystem CO2 exchange (NEE) of both treatments were synchronously measured with two eddy covariance systems during the growing seasons of 2011 through 2013. At same time green leaf area index (GLAI) and biomass were also measured biweekly. Compared with CK, the warmer and wetter (+1.3°C and +4.3%) top soil at MFR accelerated the rates of biomass accumulation, promoted greater green leaf area and thus shortened the growing seasons by an average value of 10.4 days for three years. MFR stimulated assimilation more than respiration during whole growing season, resulting in a higher carbon sequestration in terms of NEE of -79 gC/m2 than CK. However, after considering carbon in harvested grain (or aboveground biomass), there is a slight higher carbon sink (or a stronger carbon source) in MFR due to its greater difference of aboveground biomass than that of grain between both treatments. These results demonstrate that partial plastic film mulched furrow-ridge tillage with aboveground biomass exclusive of grain returned to the soil is an effective way to enhance simultaneously carbon sequestration and grain yield of maize in the semiarid regions.

No MeSH data available.