Effects of nitrogen fertilizer, soil temperature and moisture on the soil-surface CO 2 efflux and production in an oasis cotton field in arid northwestern China

Yu, Yongxiang; Zhao, Chengyi; Hu, Jia; Niu, Baicheng; Sheng, Yu; Shi, Fengzhi

doi:10.1016/j.geoderma.2017.07.032

Cited by 28 publications

(7 citation statements)

References 39 publications

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“…However, both production rates and cumulative emissions of CO 2 in all soils increased with increasing WHC after 4 days of incubation. The result of elevated CO 2 emission with increasing moisture was consistent with other studies (Borken et al, 2003;Maucieri et al, 2017;Wang et al, 2015;Yu et al, 2017). Water-blocked soil pores and reduced diffusivity could be responsible for increasing CO 2 emissions under excessive soil moisture stress, and result in the accumulation of CO 2 in the soil profile (Gaumont-Guay et al, 2006;Pumpanen et al, 2008).…”

Section: Discussionsupporting

confidence: 90%

Co-effects of salinity and moisture on CO2 and N2O emissions of laboratory-incubated salt-affected soils from different vegetation types

et al. 2018

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The temporal variation of precipitation and relevant salinity fluctuation can significantly affect greenhouse gas (GHG) emissions of salt-affected soils in the Yellow River Delta (YRD) of China. The current study aims to investigate the effects of salinity and moisture on CO 2 and N 2 O emissions of saline soils. Soils collected from different vegetation communities were incubated in glass Mason jars under treatment of different levels of salinity and moisture. Gas samples were collected from the headspace of jars and analyzed using gas chromatography during the incubation period. Soil CO 2 and N 2 O emission rates decreased steadily over time, and then were relatively stable during the final incubation. Cumulative CO 2 and N 2 O emissions increased steadily across the incubation period in all treatments. However, cumulative N 2 O emissions in bare land with no vegetation cover decreased steadily. In general, production rate and cumulative emission of CO 2 were highest in herbage communities, were intermediate in woody community, and were lowest in bare land under all treatments. The negative relationship between cumulative GHG emission and soil salinity was more significant in soils that contained low levels of salt, than that in other soils. The significant positive correlation between cumulative GHG emissions and soil moisture was found in all soils. The effects of salinity on GHG emission were stronger in soils with low levels of salt. Compared with soils collected from bare land with no vegetation cover, soils from different vegetation communities emitted more CO 2 and N 2 O. Perhaps more attention, therefore, should be paid to pulse emissions of GHG as a result of destruction of vegetation in the course of exploitation and utilization of saline soil resources.

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Section: Discussionsupporting

confidence: 90%

Co-effects of salinity and moisture on CO2 and N2O emissions of laboratory-incubated salt-affected soils from different vegetation types

et al. 2018

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“…The F 14 CO 2 values from the surface chambers are lower than the F 14 CO 2 values associated with any of the microcosms, suggesting that the surface CO 2 effluxes are predominantly derived from younger CO 2 produced in the Ap and A horizons (≤22.5-cm depth) and not older CO 2 produced in the B and C horizons (>22.5-cm depth). This is consistent with our estimated CO 2 flux profile derived from subsurface concentration measurements indicating higher outward fluxes at shallower depths (Figure 3d), as well as with previous work (Alvarez et al, 1995;Drewitt et al, 2005;Fierer et al, 2003;Hashimoto & Komatsu, 2006;Maier & Schack-Kirchner, 2014;Moncrieff & Fang, 1999;Wang et al, 2013;Yu et al, 2017).…”

Section: Discussionsupporting

confidence: 93%

Relationships between carbon age and CO₂ efflux in agricultural and drainage ditch soils using the thermonuclear bomb pulse

Blume

Guitard

Crann

et al. 2022

Vadose Zone Journal

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Agricultural soils contribute significantly to global CO 2 emissions. Soils can be both a CO 2 sink and source depending on vegetation cover and the physical-chemical characteristics of the soil environment. This study uses a new 14 C dating approach to elucidate soil physical and geochemical properties that drive the production and transport of CO 2 in cultivated and noncultivated drainage ditch soil environments. As expected, CO 2 production and fluxes decrease with soil depth. Relating depth-specific subsurface radiocarbon of CO 2 ( 14 CO 2 ) to the atmospheric scenario generated from the testing of thermonuclear bombs in the 1950s and 1960s provides a means to date the labile organic C pools responsible for soil respiration that are otherwise generalized as having a modern age (≤1950 AD). Depth-specific 14 CO 2 measurements showed that CO 2 in shallow soils (≤22.5-cm depth) have a younger age than CO 2 in deeper soils (>22.5-cm depth). The 14 CO 2 of surface emissions were comparable to those of shallow soils (≤22.5-cm depth), showing that respiration in the deeper soils (>22.5-cm depth) do not contribute significantly to surface emissions, and the higher CO 2 concentrations at depth in soil result from processes limiting CO 2 transport to surface. Coupling the 14 C data with CO 2 flux profiles confirms that CO 2 effluxes are derived from modern soil organic C (<10 yr since sequestered) from the shallowest soil depths in all soil environments studied, but changes in physical soil processes governing gas transport at depth could release these deeper CO 2 stores.Abbreviations: 14 C, radiocarbon; 14 C yr BP, radiocarbon years before present; 14 CO 2 , radiocarbon of carbon dioxide; AMS, accelerator mass spectrometry; F 14 C, fraction modern carbon; F 14 C LSOC , fraction modern carbon of labile soil organic carbon; F 14 CO 2 , fraction modern carbon of carbon dioxide; F 14 C SOC , fraction modern carbon of soil organic carbon; HAP, headspace accumulation period; LSOC, labile soil organic carbon; SOC, soil organic carbon.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…y 1 =0.0492-1.1484x 1 -0.1633x 2 -0.0773x 5 -0.0606x 6 The above results show that the stepwise regression equations of the tillage-layer temperature and environmental factors under the different treatments were different. Among them, the simulation equation of the tillage-layer temperature under the BL treatment had the greatest number of environmental factors, with six variables included in the model after variable selection.…”

Section: Construction Of Stepwise Regression Equationsmentioning

confidence: 88%

Impact factors and dynamic simulation of tillage-layer temperature in frozen-thawed soil under different cover conditions

Wang

et al. 2018

International Journal of Agricultural and Biological Engineering

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Based on a winter field experiment between 2016 and 2017, four treatments (bare land (BL), natural snowfall coverage (NS), 5-cm-deep straw + natural snowfall coverage (SC5), and 10-cm-deep straw + natural snowfall coverage (SC10)) were established to determine the effects of the different treatments on soil temperature at the soil surface and at depths of 10 cm, 20 cm, and 30 cm. The environmental factors of ambient temperature, ambient humidity, water vapor pressure, 10-min wind speed, total radiation, net radiation, and long wave radiation were obtained from the weather station in the study area. Through correlation, multiple regression, and stepwise regression analysis, models for dynamic simulation of the tillage-layer soil temperature were constructed for analyzing the relation between tillage-layer soil temperature and environmental factors. The results showed that the environmental factors were all significantly correlated with tillage-layer temperature at the 0.01 level; when the impacts of other environmental factors were excluded, the correlations decreased significantly. The dynamic simulation models for tillage-layer soil temperature under different coverage conditions were different, and the larger the coverage amount, the fewer the environmental factors that could affect the tillage-layer temperature. The coefficients of determination of the prediction results of the dynamic models for the tillage-layer soil temperature under the four treatments (BL, NS, SC5, and SC10) were 0.8385, 0.7110, 0.7283, and 0.6216, respectively. The prediction had a high accuracy and can accurately depict the dynamic changes of the tillage-layer soil temperature. The results provided a theoretical basis for the efficient utilization of farmland soil water and heat resources. Keywords: farmland cover condition, frozen-thawed soil, tillage-layer temperature, impact factor, dynamic simulation, stepwise regression DOI: 10.25165/j.ijabe.20181102.3068Citation: Fu Q, Ma Z A, Wang E L, Li T X, Hou R J. Impact factors and dynamic simulation of tillage-layer temperature in frozen-thawed soil under different cover conditions. Int J Agric & Biol Eng, 2018; 11(2): 101-107.

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Effects of nitrogen fertilizer, soil temperature and moisture on the soil-surface CO 2 efflux and production in an oasis cotton field in arid northwestern China

Cited by 28 publications

References 39 publications

Co-effects of salinity and moisture on CO2 and N2O emissions of laboratory-incubated salt-affected soils from different vegetation types

Co-effects of salinity and moisture on CO2 and N2O emissions of laboratory-incubated salt-affected soils from different vegetation types

Relationships between carbon age and CO₂ efflux in agricultural and drainage ditch soils using the thermonuclear bomb pulse

Impact factors and dynamic simulation of tillage-layer temperature in frozen-thawed soil under different cover conditions

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Effects of nitrogen fertilizer, soil temperature and moisture on the soil-surface CO 2 efflux and production in an oasis cotton field in arid northwestern China

Cited by 28 publications

References 39 publications

Co-effects of salinity and moisture on CO2 and N2O emissions of laboratory-incubated salt-affected soils from different vegetation types

Co-effects of salinity and moisture on CO2 and N2O emissions of laboratory-incubated salt-affected soils from different vegetation types

Relationships between carbon age and CO2 efflux in agricultural and drainage ditch soils using the thermonuclear bomb pulse

Impact factors and dynamic simulation of tillage-layer temperature in frozen-thawed soil under different cover conditions

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Relationships between carbon age and CO₂ efflux in agricultural and drainage ditch soils using the thermonuclear bomb pulse