Effects of<i>in situ</i>freezing on soil net nitrogen mineralization and net nitrification in fertilized grassland of northern China

Zhang, X.; Bai, Wenming; Gilliam, Frank S.; Wang, Q.; Han, Xingguo; Li, L.

doi:10.1111/j.1365-2494.2011.00789.x

Cited by 19 publications

(11 citation statements)

References 56 publications

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“…However, the results of the current study suggest that denitrification mainly contributed to the N 2 O emissions during freeze-thaw cycles [74]. The large amount of NO 3 -that accumulated during the lengthy winter [75] stimulated denitrification. In addition, the topsoil thawed first, but the deeper soil remained frozen and was not permeable to water.…”

Section: N 2 O Fluxmentioning

confidence: 50%

The Emissions of Carbon Dioxide, Methane, and Nitrous Oxide during Winter without Cultivation in Local Saline-Alkali Rice and Maize Fields in Northeast China

et al. 2017

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Agricultural ecosystems are important contributors to atmospheric greenhouse gasses (GHGs); however, in situ winter emission data in saline-alkali fields are scarce. Gas samples were collected during different periods, from three rice (R1-R3) and three maize (M1-M3) fields with different soil pH levels and salinity conditions. Carbon dioxide (CO 2 ) emissions in the rice and maize fields decreased with decreasing temperature during the freezing period and increased with the rising temperature during the thawing period, with the majority of winter CO 2 emissions occurring during these two periods. Peaks in methane (CH 4 ) emissions were observed during the freezing period in the rice fields and during the snow-melting period in the rice and maize fields. CH 4 emissions in the rice fields and CH 4 uptake rates in the maize fields were significantly (P < 0.05) related to surface soil temperature. Nitrous oxide (N 2 O) emissions remained relatively low, except for during the peaks observed during the snow-melting period in both the rice and maize fields, leading to the high GHG contribution of the snow-melting period throughout the winter. Higher pH and salinity conditions consistently resulted in lower CO 2 , CH 4 , and N 2 O emissions, CH 4 uptake, and lower global warming potential (GWP). These results can contribute to the assessment of the GWP during winter in saline-alkali regions.

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Section: N 2 O Fluxmentioning

confidence: 50%

The Emissions of Carbon Dioxide, Methane, and Nitrous Oxide during Winter without Cultivation in Local Saline-Alkali Rice and Maize Fields in Northeast China

et al. 2017

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“…In contrast, lower temperatures (e.g. 10°C) exhibited inhibiting effects (Figure 1) due to lower microbial and enzyme activities [19], [41]. Grenon et al [42] also showed that most microbial metabolic rates are positively related to temperature.…”

Section: Discussionmentioning

confidence: 97%

“…Gilliam et al [18] suggested that mild freezing might inhibit N mineralizing microbes and stimulate N immobilizing groups. However, Zhang et al [19] demonstrated that mild freezing had few effects on N mineralization, while Gao et al [2] observed higher N mineralization rates in winter than in summer in a seasonal flooding wetland. Therefore, a better understanding of how variation of air temperature could affect N mineralization is urgently needed since the potential increase of the earth's surface temperature could be 1.8–4.0°C at the end of this century [20] .…”

Section: Introductionmentioning

confidence: 99%

High Temperature and Salinity Enhance Soil Nitrogen Mineralization in a Tidal Freshwater Marsh

Gao

Bai

et al. 2014

PLoS ONE

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Soil nitrogen (N) mineralization in wetlands is sensitive to various environmental factors. To compare the effects of salinity and temperature on N mineralization, wetland soils from a tidal freshwater marsh locating in the Yellow River Delta was incubated over a 48-d anaerobic incubation period under four salinity concentrations (0, 10, 20 and 35‰) and four temperature levels (10, 20, 30 and 40°C). The results suggested that accumulated ammonium nitrogen (NH4 +-N) increased with increasing incubation time under all salinity concentrations. Higher temperatures and salinities significantly enhanced soil N mineralization except for a short-term (≈10 days) inhibiting effect found under 35‰ salinity. The incubation time, temperature, salinity and their interactions exhibited significant effects on N mineralization (P<0.001) except the interactive effect of salinity and temperature (P>0.05), while temperature exhibited the greatest effect (P<0.001). Meanwhile, N mineralization processes were simulated using both an effective accumulated temperature model and a one-pool model. Both models fit well with the simulation of soil N mineralization process in the coastal freshwater wetlands under a range of 30 to 40°C (R2 = 0.88–0.99, P<0.01). Our results indicated that an enhanced NH4 +-N release with increasing temperature and salinity deriving from the projected global warming could have profound effects on nutrient cycling in coastal wetland ecosystems.

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“…1I). To our knowledge, there is no other study investigating gross N turnover in frozen soil, but Zhang et al (2011) reported significant net nitrification or net nitrate immobilization under frozen soil conditions for steppe sites of Duolun County, Inner Mongolia, in a Fig. 4.…”

Section: Contribution Of Seasons To Annual N Turnovermentioning

confidence: 99%

Seasonality of soil microbial nitrogen turnover in continental steppe soils of Inner Mongolia

Dannenmann

Wolf

et al. 2012

Ecosphere

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). Four different seasons with characteristic functional patterns of N turnover were identified: (1) Growing season dynamics as characterized by drying/rewetting cycles and negatively correlated temporal courses of net microbial growth and periods with intensive gross ammonification, contributing 40-52% and 29-32% to cumulative annual gross ammonification and nitrification, respectively. Net N mineralization was almost exclusively observed during the growing season. (2) Microbial N dynamics during the autumn freeze-thaw period was characterized by a sharp decline in microbial biomass in conjunction with a peak of gross nitrification contributing 19-36% to cumulative annual fluxes. (3) During winter at constantly frozen soil, a net build-up of microbial biomass was observed, whereas gross N turnover rates were low, contributing 7-10% and 6-11% to cumulative annual gross ammonification or gross nitrification, respectively. (4) The spring freeze-thaw period showed extremely dynamic changes in gross N turnover and soil nitrate concentrations. This period contributed 34-44% and 21-46% to cumulative annual gross ammonification and nitrification, respectively. This study highlights that freeze-thaw cycles are key periods for understanding patterns and magnitudes of gross N turnover in semi-arid continental steppe ecosystems. The results further imply that the observed patterns of microbial biomass and gross N turnover dynamics are likely the consequence of a seasonal succession of microbial communities and turnover of microbial biomass. Our findings emphasize the necessity for high resolution studies on gross N turnover as a prerequisite to infer functioning and annual budgets of ecosystem N cycling.

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Effects ofin situfreezing on soil net nitrogen mineralization and net nitrification in fertilized grassland of northern China

Cited by 19 publications

References 56 publications

The Emissions of Carbon Dioxide, Methane, and Nitrous Oxide during Winter without Cultivation in Local Saline-Alkali Rice and Maize Fields in Northeast China

The Emissions of Carbon Dioxide, Methane, and Nitrous Oxide during Winter without Cultivation in Local Saline-Alkali Rice and Maize Fields in Northeast China

High Temperature and Salinity Enhance Soil Nitrogen Mineralization in a Tidal Freshwater Marsh

Seasonality of soil microbial nitrogen turnover in continental steppe soils of Inner Mongolia

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