Nitrogen deposition and<i>Leymus chinensis</i>leaf chlorophyll content in Inner Mongolian grassland

Zhang, Yunhai; Yunhai, 张云海 Zhang; Guangming, 张光明 Zhang; Nianpeng, He; Nianpeng, 何念鹏 He; Huang, Jianhui; Jianhui, 黄建辉 Huang; Zhang, Guangming; Han, Xingguo; Xingguo, 韩兴国 Han

doi:10.5846/stxb201207050939

Cited by 11 publications

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“…Although the N addition frequency had little influence on ANPP (Zhang, Feng, et al, 2015;, the temporal stability of the community (Zhang et al, 2019;Zhang, Loreau, et al, 2016), and the N uptake efficiency (Rens et al, 2016), higher N addition frequency was related to slower species loss , a greater colonization of new species (Zhang, Stevens, et al, 2016), and lower leaf chlorophyll content of the key grassland species, Leymus chinensis (Zhang, He, Zhang, Huang, & Han, 2013), compared to lower N addition frequency. Changes in N addition frequency may particularly influence BNPP responses because of its susceptibility to changes in species composition due to the variation in root biomass among species (Pan, Bai, Wu, & Han, 2011) and the C supply from the shoot (Bai et al, 2015).…”

Section: Introductionmentioning

confidence: 92%

Asymmetry in above‐ and belowground productivity responses to N addition in a semi‐arid temperate steppe

Jing

Gao

Zhang

et al. 2019

Global Change Biology

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Nitrogen (N) enrichment often increases aboveground net primary productivity (ANPP) of the ecosystem, but it is unclear if belowground net primary productivity (BNPP) track responses of ANPP. Moreover, the frequency of N inputs may affect primary productivity but is rarely studied. To assess the response patterns of above‐ and belowground productivity to rates of N addition under different addition frequencies, we manipulated the rate (0–50 g N m−2 year−1) and frequency (twice vs. monthly additions per year) of NH4NO3 inputs for six consecutive years in a temperate grassland in northern China and measured ANPP and BNPP from 2012 to 2014. In the low range of N addition rates, BNPP showed the greatest negative response and ANPP showed the greatest positive responses with increases in N addition (<10 g N m−2 year−1). As N addition increased beyond 10 g N m−2 year−1, increases in ANPP dampened and decreases in BNPP ceased altogether. The response pattern of net primary productivity (combined above‐ and belowground; NPP) corresponded more closely to ANPP than to BNPP. The N effects on BNPP and BNPP/NPP (fBNPP) were not dependent on N addition frequency in the range of N additions typically associated with N deposition. BNPP was more sensitive to N addition frequency than ANPP, especially at low rates of N addition. Our findings provide new insights into how plants regulate carbon allocation to different organs with increasing N rates and changing addition frequencies. These root response patterns, if incorporated into Earth system models, may improve the predictive power of C dynamics in dryland ecosystems in the face of global atmospheric N deposition.

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Section: Introductionmentioning

confidence: 92%

Asymmetry in above‐ and belowground productivity responses to N addition in a semi‐arid temperate steppe

Jing

Gao

Zhang

et al. 2019

Global Change Biology

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“…An effect of increased nitrogen availability is an increased pigment concentration, especially chlorophyll [79]. Measuring chlorophyll content by colorimetry in the laboratory is quite straightforward and various portable optical instruments, which are rather inexpensive, are available for non-destructive measurements of chlorophyll content in the field [80,81]. Additionally, changes in the chlorophyll a/b ratio have been shown to fluctuate in response to increasing nitrogen deposition, and the concentrations of accessory pigments, particularly those from the xanthophyll cycle, can indicate the plant sensitivity to different pollutants [50,79,82].…”

Section: Photosynthesis Related Parametersmentioning

confidence: 99%

Selecting Biomonitors of Atmospheric Nitrogen Deposition: Guidelines for Practitioners and Decision Makers

2021

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Environmental pollution is a major threat to public health and is the cause of important economic losses worldwide. Atmospheric nitrogen deposition is one of the most significant components of environmental pollution, which, in addition to being a health risk, is one of the leading drivers of global biodiversity loss. However, monitoring pollution is not possible in many regions of the world because the instrumentation, deployment, operation, and maintenance of automated systems is onerous. An affordable alternative is the use of biomonitors, naturally occurring or transplanted organisms that respond to environmental pollution with a consistent and measurable ecophysiological response. This policy brief advocates for the use of biomonitors of atmospheric nitrogen deposition. Descriptions of the biological and monitoring particularities of commonly utilized biomonitor lichens, bryophytes, vascular epiphytes, herbs, and woody plants, are followed by a discussion of the principal ecophysiological parameters that have been shown to respond to the different nitrogen emissions and their rate of deposition.

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“…The importance of nitrogen (N) lies in its crucial role in improving the productivity and sustainability of agricultural, forest and pastoral lands [1][2][3]. Being…”

Section: Introductionmentioning

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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Nitrogen deposition andLeymus chinensisleaf chlorophyll content in Inner Mongolian grassland

Cited by 11 publications

References 0 publications

Asymmetry in above‐ and belowground productivity responses to N addition in a semi‐arid temperate steppe

Asymmetry in above‐ and belowground productivity responses to N addition in a semi‐arid temperate steppe

Selecting Biomonitors of Atmospheric Nitrogen Deposition: Guidelines for Practitioners and Decision Makers

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

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