Impacts of reactive nitrogen on climate change in China

Shi, Yalan; Cui, Shenghui; Ju, Xiaotang; Cai, Zucong; Zhu, Yan

doi:10.1038/srep08118

Cited by 53 publications

(34 citation statements)

References 53 publications

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“…Soil weathering rates are slower at the lower temperatures presenting at high elevations (Kitayama, Majalap‐Lee, & Aiba, ), and in dry climates at any elevation (Rasmussen, Dahlgren, & Southard, ); therefore, global change would further interact with different parent materials, causing different responses of soil nutrients to global change along a spatial climate gradient. The stronger responses of soil C‐N‐P stoichiometry associated with higher MAT may indicate that lower‐elevation (warmer) areas have been subjected to more intense human‐induced global change relative to areas at high elevations and latitudes (Shi, Cui, Ju, Cai, & Zhu, ). Because vegetation and soil types vary across latitude and elevation, the greater response of evergreen forests and Ultisols suggest that ecosystems at lower elevation are subjected to more human‐induced global change compared to higher elevation forests (Jia et al., ).…”

Section: Discussionmentioning

confidence: 99%

Temporal changes in soil C‐N‐P stoichiometry over the past 60 years across subtropical China

Wang

Huang

et al. 2017

Global Change Biology

117

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Controlled experiments have shown that global changes decouple the biogeochemical cycles of carbon (C), nitrogen (N), and phosphorus (P), resulting in shifting stoichiometry that lies at the core of ecosystem functioning. However, the response of soil stoichiometry to global changes in natural ecosystems with different soil depths, vegetation types, and climate gradients remains poorly understood. Based on 2,736 observations along soil profiles of 0-150 cm depth from 1955 to 2016, we evaluated the temporal changes in soil C-N-P stoichiometry across subtropical China, where soils are P-impoverished, with diverse vegetation, soil, and parent material types and a wide range of climate gradients. We found a significant overall increase in soil total C concentration and a decrease in soil total P concentration, resulting in increasing soil C:P and N:P ratios during the past 60 years across all soil depths. Although average soil N concentration did not change, soil C:N increased in topsoil while decreasing in deeper soil. The temporal trends in soil C-N-P stoichiometry differed among vegetation, soil, parent material types, and spatial climate variations, with significantly increased C:P and N:P ratios for evergreen broadleaf forest and highly weathered Ultisols, and more pronounced temporal changes in soil C:N, N:P, and C:P ratios at low elevations. Our sensitivity analysis suggests that the temporal changes in soil stoichiometry resulted from elevated N deposition, rising atmospheric CO concentration and regional warming. Our findings revealed that the responses of soil C-N-P and stoichiometry to long-term global changes have occurred across the whole soil depth in subtropical China and the magnitudes of the changes in soil stoichiometry are dependent on vegetation types, soil types, and spatial climate variations.

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Section: Discussionmentioning

confidence: 99%

Temporal changes in soil C‐N‐P stoichiometry over the past 60 years across subtropical China

Wang

Huang

et al. 2017

Global Change Biology

117

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“…Furthermore, it is predicted that there is an approximately 10% increase in atmospheric NO x deposition by 2030, mainly because more energy would be consumed in a warmer climate [Wilbanks et al, 2008;Karl, 2009]. In addition, considering the increase in crops yield stimulated by the CO 2 -fertilzation effect, an approximately 5% reduction in net nitrogen export in food and feed is expected by 2030 [Daniel et al, 2009;Shi et al, 2015]. Under all of these conditions, this scenario projects an increase of 7.3% for NANI and 4.8% for riverine DIN export in the Yangtze River basin by 2030 ( Figure S6).…”

Section: Forecasting Future Riverine Nani and Din Exportmentioning

confidence: 99%

Net anthropogenic nitrogen inputs (NANI) into the Yangtze River basin and the relationship with riverine nitrogen export

et al. 2016

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This study investigated net anthropogenic nitrogen inputs (NANI, including atmospheric nitrogen deposition, nitrogenous fertilizer use, net nitrogen import in food and feed, and agricultural nitrogen fixation) and the associated relationship with riverine dissolved inorganic nitrogen (DIN) export in the Yangtze River basin during the 1980–2012 period. The total NANI in the Yangtze River basin has increased by more than twofold over the past three decades (3537.0 ± 615.3 to 8176.6 ± 1442.1 kg N km−2 yr−1). The application of chemical fertilizer was the largest component of NANI in the basin (51.1%), followed by net nitrogen import in food and feed (26.0%), atmospheric nitrogen deposition (13.2%), and agricultural nitrogen fixation (9.7%). A regression analysis showed that the riverine DIN export was strongly correlated with NANI and the annual water discharge (R2 = 0.90, p < 0.01). NANI in the Yangtze River basin was estimated to contribute 37–66% to the riverine DIN export. We also forecasted future variations in NANI and riverine DIN export for the years 2013 to 2030, based on possible future changes in human activities and the climate. This work provides a quantitative understanding of NANI in the Yangtze River basin and its effects on riverine DIN export and helps to develop integrated watershed nitrogen management strategies.

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“…Less attention has been paid to tropical and subtropical regions, where the availability of soil N is considered to be high (Chen et al 2012). Anthropogenic activities have caused noticeable increases in atmospheric N deposition, which is as high as 30-73 kg N ha −1 in precipitation annually in some subtropical forests (Liu et al 2013;Shi et al 2015); this is now a serious environmental concern. The effects of N addition on N mineralization globally have been demonstrated in several previous studies (Mayor et al 2014;Kou et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen addition accelerates the nitrogen cycle in a young subtropical Cunninghamia lanceolata (Lamb.) plantation

Zhang

Zhou

et al. 2019

Annals of Forest Science

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& Key message The nitrogen (N) cycle is likely to accelerate under future climate change. Leaf δ 15 N enrichment factor is an indicator of N status in young Cunninghamia lanceolata (Lamb.) plantation ecosystems. Given that N dynamics across the plant-soil continuum respond more strongly to N addition during the dry season when N leaching is minimal, fertilization during this period represents an optimal strategy for improving soil fertility. & Context The effects of N deposition on N dynamics across the plant-soil continuum in subtropical regions are poorly understood. & Aims We investigated the effects of N addition on the N dynamics across the plant-soil continuum in young C. lanceolata plantations in different seasons as well as the effects of N addition on the soil microbial community. & Methods During the dry and wet seasons, we measured the concentrations of soil inorganic N, dissolved organic N in soil solution, leaf and root N concentrations, and stable isotope abundances, and soil microbial community characteristics. & Results Short-term N addition decreased the levels of inorganic N, dissolved organic N, and leaf N concentration in the dry season; root N concentration was significantly higher in the high N and low N addition plots. Irrespective of treatment, the NH 4 + / NO 3 − ratio was higher in the wet season than in the dry season. The δ 15 N enrichment factors of the leaf and root in our experiments were closer to zero for all N addition treatments. Redundancy analysis revealed that the variation in the soil microbial community had low correlation with pH. & Conclusion Nitrogen dynamics across the plant-soil continuum respond more strongly to N addition in the dry season. High N deposition in N-saturated subtropical forest soil may rapidly increase leaching, particularly during the wet season. Nutrients in roots are more sensitive to changes in soil nutrient availability than those in leaves. The microbial community is primarily regulated by nutrient availability in the soil rather than by pH.

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Impacts of reactive nitrogen on climate change in China

Cited by 53 publications

References 53 publications

Temporal changes in soil C‐N‐P stoichiometry over the past 60 years across subtropical China

Temporal changes in soil C‐N‐P stoichiometry over the past 60 years across subtropical China

Net anthropogenic nitrogen inputs (NANI) into the Yangtze River basin and the relationship with riverine nitrogen export

Nitrogen addition accelerates the nitrogen cycle in a young subtropical Cunninghamia lanceolata (Lamb.) plantation

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