15N tracing studies including plant N uptake processes provide new insights on gross N transformations in soil-plant systems

He, Xiaoxiang; Chi, Qiang; Cai, Zucong; Cheng, Yi; Zhang, Jinbo; Müller, Christoph

doi:10.1016/j.soilbio.2019.107666

Cited by 49 publications

(26 citation statements)

References 39 publications

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“…Gross N transformation rates in paddy soils were determined by 15 N tracing experiment in combination with the Ntrace plant tool (He et al 2020) to quantify gross N transformation and plant N uptake rates.…”

Section: Methodsmentioning

confidence: 99%

“…Appropriate modi cations were made to the 15 N tracing experiment designed by (He et al 2020). Brie y, on day 30 after transplanting, two sets of 15 N isotope markers were set, one for 15 NH 4 14 NO 3 (10.20% atom) and the other for 14 NH 4 15 NO 3 (10.12% atom).…”

Section: N Tracing Experimentsmentioning

confidence: 99%

“…Soil N transformation processes regulate the concentration and form of inorganic N in the soil, which in turn affects N uptake and NUE in different plants (Wang et In this study, the two rice genotypes Wuyujing 3 (WYJ3) and Wuyunjing 7 (WYJ7), which had the weakest and strongest BNI exudation capacity, respectively, among 13 japonica rice genotypes under hydroponic conditions (Sun et al 2016), and four soils with different pH were selected. To test our hypothesis, the soil N transformation rates and plant N uptake rates in soil-rice systems were simultaneously quanti ed using the Ntrace plant tool (He et al 2020), N use e ciency (NUE) and N loss were determined under a 15 N urea labeling experiment. With the two experiments described above, we achieved a direct link between nitri cation inhibition capacity and N uptake and NUE in rice.…”

Section: Introductionmentioning

confidence: 99%

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Rice genotypes significantly affect nitrification inhibition activity in the rhizosphere

Chen

He²,

Zhao³

et al. 2022

Preprint

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Biological nitrification inhibitor (BNI) can play an important role in inhibiting nitrification and enhancing nitrogen use efficiency (NUE) in agriculture. However, most of current BNI studies have been conducted under hydroponics. Variations in genotype-mediated inhibition of soil nitrification are still unknown. In this study, two rice genotypes, i.e. Wuyujing 3 (WYJ3) and Wuyunjing 7 (WYJ7), which were reported to have weak and strong BNI capacity under hydroponics, respectively, and four soils with different pH (i.e. JX (pH 5.09), FJ (pH 6.00), SC1 (pH 7.96) and SC2 (pH 7.94)) were selected. N uptake rates (esp. NH4+ uptake, UNH4), soil N transformation rates and NUE were quantified by 15N tracing experiment to assess the effects of rice genotypes on nitrification inhibition activity. Results showed that rice genotypes with high BNI exudation (i.e. WYJ7) had lower autotrophic nitrification rate (ONH4) and higher UNH4 in rhizosphere compared to WYJ3. ONH4 in WYJ7 reduced by 0.05, 0.42, 1.14, and 0.48 mg N kg− 1 d− 1 compared with WYJ3 for JX, FJ, SC1 and SC2, respectively. Abundance of AOB in soils planted WYJ7 was lower than WYJ3, which was the key factor affecting ONH4. NUE of WYJ7 was higher than WYJ3, although difference between genotypes was not significant. NUE was negatively correlated with ONH4 (P < 0.05). Our results indicated that some rice genotypes can optimize their N acquisition by regulating soil N transformations (particularly nitrification). Developing rice genotype with strong BNI exudation capacity could be a suitable management practice to increase NUE and yield.

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Section: Methodsmentioning

confidence: 99%

Section: N Tracing Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rice genotypes significantly affect nitrification inhibition activity in the rhizosphere

Chen

He²,

Zhao³

et al. 2022

Preprint

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“…Although isotope approaches offer us the potential to determine a single N transformation process, they cannot be applied to reveal all known processes simultaneously. In recent years, many Chinese scholars modified the numerical 15 N tracing models (e.g., Ntrace models established by Müller et al (2007)) and attempted to reveal most of the known N processes simultaneously, which is helpful to synthetically understanding N dynamics in natural ecosystems (He et al, 2020). However, the predominantly recognized numerical models are only appropriate for terrestrial ecosystems due to the lack of considering denitrification and anammox (Figure 4(a)).…”

Section: Conclusion and Further Outlookmentioning

confidence: 99%

Nitrogen cycling in aquatic environments of China: Progress and future challenges

Hou

Gao

Zheng

et al. 2022

Progress in Physical Geography: Earth and Environment

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Aquatic environments are hot spots of nitrogen (N) cycling and nitrous oxide (N2O) emission. Understanding key N biogeochemical processes and N2O dynamics is critical for uncovering the responses of aquatic environments to human activities. In this study, we summarized the development of techniques and approaches for determination of N cycling processes and N2O sources in aquatic environments of China. We also reviewed the main N transformation processes and associated biogeochemical controls in aquatic environments of China (e.g., constructed wetlands, paddy fields, lakes, rivers, aquaculture ponds, and estuaries and coasts). In addition, we further synthesized N2O dynamics in these aquatic environments. The results suggested that N cycling processes have been greatly concerned in various aquatic environments of China, whereas more comprehensive analyses of N cycling processes are still sparse for projecting N fates and dynamics in response to changing environments, largely limiting the implementation of N management strategy of China. Aquatic environments of China may be the important sources of atmospheric N2O, but the production and consumption processes of N2O need to be further studied for effective greenhouse gas mitigation. We also argued that it is urgently necessary to incorporate microbial traits into biogeochemical ecosystem modeling to improve the estimation reliability of N cycling and N2O dynamics. This review highlights the importance of N cycling and N2O dynamics, as well as associated environmental implications, and presents the directions of future research on N cycling in aquatic environments of China.

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“…He et al 2020). The Markov Chain Monte Carlo algorithm is the key numerical technique for data analysis, and can determine the probability density function for each parameter and calculate true parameter uncertainties.…”

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confidence: 99%

Reductive soil disinfestation promoted vegetable N uptake by regulating soil gross N transformations and improving the quality of degraded vegetable soils

zhang,

Dan,

et al. 2022

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Aims Reductive soil disinfestation (RSD) has been widely applied to improve soil degradation, thereby enhancing vegetable N uptake and subsequently productivity. However, the effect of RSD on interactions between vegetable N uptake and soil gross N transformation remain unclear. Methods Two degraded vegetable soils were treated with RSD. Untreated soils served as control (CK). To quantify the effects of RSD on N cycling in vegetable-soil systems, 15N tracing pot experiments were conducted. Results Vegetable NH4+ and NO3− uptake rates were 1.0–6.5 times higher in RSD treatments than CK. Soil gross N mineralization rates (M) in RSD ranged from 0.83 to 13.00 mg N kg− 1 d− 1, and were significantly higher than in CK (0.21 to 8.71 mg N kg− 1 d− 1). Autotropic nitrification rates (ONH4) increased by 1.7–4.2 times after RSD. NH4+ immobilization rates (INH4) were significantly inhibited by RSD in the presence of vegetables. These induced decreasing (ONH4 + INH4)/M, increasing NH4+ retention times and production rates of soil NO3− after RSD treatment. Thus, RSD promoted N supply to vegetables and subsequently N uptake by vegetables on degraded soils. In addition, RSD improved the quality on degraded soils (i.e. increasing soil pH, and decreasing soil EC and NO3− contents and pathogen abundances), which could also be an important factor promoting vegetable N uptake. Conclusion Thus, RSD can promote vegetable N uptake by regulating soil gross N transformations and improving the quality of degraded vegetable soils. However, N fertilizer management still needs attention because of stimulated NO3− production rates after RSD, which may lead to more rapid NO3− leaching or gaseous N losses.

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15N tracing studies including plant N uptake processes provide new insights on gross N transformations in soil-plant systems

Cited by 49 publications

References 39 publications

Rice genotypes significantly affect nitrification inhibition activity in the rhizosphere

Rice genotypes significantly affect nitrification inhibition activity in the rhizosphere

Nitrogen cycling in aquatic environments of China: Progress and future challenges

Reductive soil disinfestation promoted vegetable N uptake by regulating soil gross N transformations and improving the quality of degraded vegetable soils

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