Role of Carbon Substrates Added in the Transformation of Surplus Nitrate to Organic Nitrogen in a Calcareous Soil

Qiu, Shaojun; Ju, Xiaotang; Ingwersen, Joachim; Guo, Zide; Stange, Claus Florian; Bisharat, Riyad; Streck, Thilo; Christie, Peter; Zhang, Fusuo

doi:10.1016/s1002-0160(13)60008-9

Cited by 31 publications

(7 citation statements)

References 28 publications

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“…Soil water-filled pore space (WFPS) contains enough oxygen and seldom reaches the necessary anaerobic conditions for denitrification to convert the nitrate to N 2 or N 2 O 25 . The processes immobilizing nitrate in soil organic matter (SOM) or soil microbes are weak due to low SOM and lack of significant carbon sources 26 . Therefore, a large amount of nitrate accumulates in Chinese semi-humid croplands, which are characterized by a high N surplus, low carbon content, strong mineralization and nitrification abilities, and weak immobilization and denitrification abilities.…”

Section: Discussionmentioning

confidence: 99%

Significant accumulation of nitrate in Chinese semi-humid croplands

Zhou

Schlesinger

et al. 2016

Sci Rep

175

123

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Soil nitrate is important for crop growth, but it can also leach to groundwater causing nitrate contamination, a threat to human health. Here, we report a significant accumulation of soil nitrate in Chinese semi-humid croplands based upon more than 7000 samples from 141 sites collected from 1994 to 2015. In the 0–4 meters depth of soil, total nitrate accumulation reaches 453 ± 39, 749 ± 75, 1191 ± 89, 1269 ± 114, 2155 ± 330 kg N ha−1 on average in wheat, maize, open-field vegetables (OFV), solar plastic-roofed greenhouse vegetables (GHV) and orchard fields, respectively. Surprisingly, there is also a comparable amount of nitrate accumulated in the vadose-zone deeper than 4 meters. Over-use of N fertilizer (and/or manure) and a declining groundwater table are the major causes for this huge nitrate reservoir in the vadose-zone of semi-humid croplands, where the nitrate cannot be denitrified due to the presence of oxygen and lack of carbon sources. Future climatic change with more extreme rainfall events would increase the risk of accumulated nitrate moving downwards and threatening groundwater nitrate contamination.

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Section: Discussionmentioning

confidence: 99%

Significant accumulation of nitrate in Chinese semi-humid croplands

Zhou

Schlesinger

et al. 2016

Sci Rep

175

123

View full text Add to dashboard Cite

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“…Significance levels (P) of the RDA models determined by 1000 permutations: ** P < 0.01; * P < 0.05. (Hai et al, 2009), nitrifiers (Wang et al, 2013;Wessén et al, 2010) and denitrifiers (Chen et al, 2010;Philippot et al, 2007), and they could impact the transformation of nitrogen in soil (Qiu et al, 2013). However, it is not clear about different effects of crop residue and livestock manure on such functional communities, especially under long-term fertilization management.…”

Section: Discussionmentioning

confidence: 99%

Effects of long-term application of chemical and organic fertilizers on the abundance of microbial communities involved in the nitrogen cycle

Sun

Guo

Wang

et al. 2015

Applied Soil Ecology

237

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“…This was the first report of new land use pattern by co-cropping herbal plant to mitigate N 2 O emitted from agricultural soil. Compared to some other agricultural practices such as N fertilizer management (KAISER et al, 1998;Ulrike et al, 2003;Chu et al, 2007;Fub et al, 2011;Aguilera et al, 2013;Fisk et al, 2015;Frederico et al, 2015), reduced tillage (Fub et al, 2011;Fisk et al, 2015;Frederico et al, 2015), drip irrigation and fertigation (Aguilera et al, 2013;Kennedy et al, 2013), organic amendments (Qiu et al, 2013;Aguilera et al, 2013;Fisk et al, 2015), crops straw incorporation (Ma et al, 2009;Yang et al, 2015), biochar (Xiang et al, 2015), nitrification inhibitor (Ranucci et al, 2011;Barneze et al, 2015), this newly developed approach could be more effective and economical as it was simple and easily to conduct in a low-cost manner for farmer. Of course, it needs to be further improved and optimized.…”

Section: Discussionmentioning

confidence: 99%

A Newly Practice to Mitigate N2O Emission from Winter Wheat Soil by Intercropping Isatis indigotica

Wu¹,

Li²,

Chen³

et al. 2016

JAS

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Greenhouse gas (GHG) emitted from agricultural field was received considerable attention worldwide, depending on differed land use and cropping system. An innovative strategy to mitigate agricultural N 2 O by intercropping traditional Chinese medicinal herb Isatis indigotica in winter wheat field was assessed. By exogenously applying root exudates of I. indigotica in a lab incubation study, we testify and quantify whether N 2 O emission was inhibited.Results demonstrated great reduction of N 2 O emission from winter field soil intercropping I. indigotica (NPKWR-N+P+K+wheat+I. indigotica) compared to CK (NPKW-N+P+K+wheat but no I. Indigotica) was found. N 2 O emission in treatment of NPKWR was decreased by 32% than that in CK during the whole winter wheat growth season, among which the best decreasing N 2 O emission was obtained in the stage of grain filling of winter wheat, N 2 O emitting from NPKWR was reduced by 60% than that in CK. The N 2 O emission intensity per kg of harvested wheat grain treated with I. indigotica was declined to 0.15 g N 2 O/kg grain from 0.24 g N 2 O/kg grain in CK.qPCR (quantitative fluorescent polymerase chain reaction) analysis indicated nitrifying microbial population in wheat soil was severely suppressed by I. indigotica. The number of qPCR gene copy in both soil intercropping I. indigotica and exogenously applying root exudates of I. indigotica was lower than in CK. Such trend of decreased microbial population number was in agreement with that of N 2 O emission from winter wheat field. This suggested that intercropping I. indigotica was a practical and simple technique to reduce N 2 O emission from winter wheat field which was an effective strategy for mitigating and adapting global change worldwide in agriculture.

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Role of Carbon Substrates Added in the Transformation of Surplus Nitrate to Organic Nitrogen in a Calcareous Soil

Cited by 31 publications

References 28 publications

Significant accumulation of nitrate in Chinese semi-humid croplands

Significant accumulation of nitrate in Chinese semi-humid croplands

Effects of long-term application of chemical and organic fertilizers on the abundance of microbial communities involved in the nitrogen cycle

A Newly Practice to Mitigate N2O Emission from Winter Wheat Soil by Intercropping Isatis indigotica

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