Effect of Grazing Intensity on Soil and Plant δ15N of an Alpine Meadow

Du, Yangong; Guo, Xiaowei; Zhang, Geng; Cao, Guangmin; Li, Yikang

doi:10.15244/pjoes/67977

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…The nitrogen-stable isotope can be used to study the impact of agricultural practices on soil quality [41,42]. In particular, the 15 N natural abundance technique has also been successfully used to monitor the trajectory of nitrogen in landscapes [43,44] and to better understand nitrogen dynamics in different soils with different grown crops, such as maize [45,46], rice [47,48], vegetable crops [49,50], coffee [51], fodder crops [52,53], and wheat [54][55][56].…”

Section: An Indispensablementioning

confidence: 99%

Nitrogen Use Efficiency Using the 15N Dilution Technique for Wheat Yield under Conservation Agriculture and Nitrogen Fertilizer

Maher,

Moussadek,

Zouahri

et al. 2023

Nitrogen

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Conservation agriculture (CA), which could contribute to sustainable agriculture, maintains or improves soil nitrogen fertility by eliminating tillage (no-tillage). Quantitative assessment of soil constituents is enhanced by stable isotope techniques such as 15N, which are used to better understand nitrogen dynamics. This study was therefore carried out to assess the impact of tillage type and fertilizer application on soil and plant nitrogen fractionation. The trial consisted of two tillage types: no-tillage (NT) and conventional tillage (CT). Three nitrogen doses (82, 115, and 149 kg ha−1) were applied. The experimental design was a randomized complete block with three replications. The Louiza variety of durum wheat was used in this study. Soil nitrogen sequestration was assessed using the stable nitrogen isotope (15N) method. The statistical analysis (ANOVA) showed that, overall, there was no significant difference between tillage types and nitrogen doses for grain and straw yields and grain total nitrogen. In contrast, the effect of both factors and their interaction were significant for straw total nitrogen. There was no difference between tillage types for grain nitrogen use efficiency (NUE), even though NT was superior to CT by 3.5%, but nitrogen doses had a significant effect and a significant interaction with tillage type. When comparing nitrogen doses for each tillage type separately, results showed that the average NUE for grain was 20.5, 8.4, and 16.5%, respectively, for the three nitrogen doses for CT compared with 26.8, 19.0, and 30.6% for NT, indicating clearly the better performance of NT compared to CT. Regarding straw, the NUE is 3.2, 3.5, and 5.4% for CT compared with 3.4, 4.9, and 9.2% for NT. NUE in grain and straw under no-tillage was higher than under conventional tillage in all three nitrogen doses. These results show that soil conservation techniques such as no-tillage and the integrated application of nitrogen fertilizer can be good strategies for reducing soil nitrogen losses.

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Section: An Indispensablementioning

confidence: 99%

Nitrogen Use Efficiency Using the 15N Dilution Technique for Wheat Yield under Conservation Agriculture and Nitrogen Fertilizer

Maher,

Moussadek,

Zouahri

et al. 2023

Nitrogen

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“…There are many studies on soil C and N, mainly involving the effects of land use [7][8][9], management measures [10][11][12], restoration measures [13][14][15][16][17][18][19] on soil C and N, and the relationship between plant functional groups and soil factors [20][21][22]. However, most related research in China has been concentrated in the Loess Plateau area [10, 13-14, 17, 19, 22], but few studies have focused on alpine regions -especially the Sanjiangyuan region [12,18,[23][24][25]. Based on the above grassland restoration background, we investigated the changes of C and N in grassland soil under different restoration measures in the Sanjiangyuan region.…”

Section: Introductionmentioning

confidence: 99%

Restoration Measures Supported Surface Soil Carbon and Nitrogen Density in Alpine Grassland of Sanjiangyuan Region, China

Chen¹,

Qi²,

FuQuan³

et al. 2020

Pol. J. Environ. Stud.

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Soil carbon (C) and nitrogen (N) have different responses to different restoration measures. In this paper, surface (0-30 cm) soil C and N densities under different restoration measures in the Sanjiangyuan region were investigated and analyzed. The results showed that although there was no significant difference between rest-grazing (RG) and normal grazing (NG) grassland, SOCD in RG increased by 10.15%, and total N density (TND) increased by 8.56% in the year of the experiment. Compared with cropland, 8 years after Grain for Green (GFG), SOCD increased by 10.49-19.31%, SICD increased by 22.47-54.20%, and TND increased by 1.3-17.45%. Compared with HTT (extreme degradation-black soil beach), 12 years after planting artificial grassland, SOCD increased by 43.97-77.21%, SICD increased by 89.19-716.22%, and TND increased by 49.16-71.40%. Conclusions: Differences in soil types and climatic zones were responsible for the differences in soil C and N in different regions. Short-term grazing rest in Sanjiangyuan region has a certain effect on soil fertility restoration. Implementing the GFG project in the agro-pastoral ecotone improved soil fertility and, concurrently, moderate disturbance should be carried out on the basis of increasing vegetation diversity. Artificial grassland planting on black soil beach can improve soil quality, and moderate grazing disturbance in winter had the best immobilization effect on SIC, while no disturbance in the whole year was beneficial to the accumulation of organic matter. Both biological and abiotic factors have affected soil C and N content and density, but the degree of the influence varied with geographic location.

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Coupling of δ13C and δ15N to understand soil organic matter sources and C and N cycling under different land-uses and management: a review and data analysis

et al. 2022

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Effect of Grazing Intensity on Soil and Plant δ15N of an Alpine Meadow

Cited by 6 publications

References 16 publications

Nitrogen Use Efficiency Using the 15N Dilution Technique for Wheat Yield under Conservation Agriculture and Nitrogen Fertilizer

Nitrogen Use Efficiency Using the 15N Dilution Technique for Wheat Yield under Conservation Agriculture and Nitrogen Fertilizer

Restoration Measures Supported Surface Soil Carbon and Nitrogen Density in Alpine Grassland of Sanjiangyuan Region, China

Coupling of δ13C and δ15N to understand soil organic matter sources and C and N cycling under different land-uses and management: a review and data analysis

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