Atmospheric nitrogen deposition in the Yangtze River basin: Spatial pattern and source attribution

Xu, Wen; Zhao, Yuanhong; Liu, Xuejun; Dore, Anthony J.; Lin, Zhang; Liu, Lei; Cheng, Miaomiao

doi:10.1016/j.envpol.2017.09.086

Cited by 86 publications

(35 citation statements)

References 72 publications

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“…Ambient N addition plots received equal dose of water. This N deposition rate is higher than the current natural N deposition rate (ranging from 0.87 to 1.38 g N ha −1 year −1 ) in this region, but atmospheric N deposition rates as high as 5.46 g m −2 year −1 in China (Xu et al, ). A recent study in the same region demonstrated that N addition rate of 8 g m −2 year −1 led to N saturation in soil (Peng & Yang, ).…”

Section: Methodsmentioning

confidence: 82%

Precipitation and nitrogen addition enhance biomass allocation to aboveground in an alpine steppe

Zheng

Peng

et al. 2019

Ecology and Evolution

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There are two important allocation hypotheses in plant biomass allocation: allometric and isometric. We tested these two hypotheses in an alpine steppe using plant biomass allocation under nitrogen (N) addition and precipitation (Precip) changes at a community level. An in situ field manipulation experiment was conducted to examine the two hypotheses and the responses of the biomass to N addition (10 g N m−2 y−1) and altered Precip (±50% precipitation) in an alpine steppe on the Qinghai–Tibetan Plateau from 2013 to 2016. We found that the plant community biomass differed in its response to N addition and reduced Precip such that N addition significantly increased aboveground biomass (AGB), while reduced Precip significantly decreased AGB from 2014 to 2016. Moreover, reduced Precip enhanced deep soil belowground biomass (BGB). In the natural alpine steppe, the allocation between AGB and BGB was consistent with the isometric hypotheses. In contrast, N addition or altered Precip enhanced biomass allocation to aboveground, thus leading to allometric growth. More importantly, reduced Precip enhanced biomass allocation into deep soil. Our study provides insight into the responses of alpine steppes to global climate change by linking AGB and BGB allocation.

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Section: Methodsmentioning

confidence: 82%

Precipitation and nitrogen addition enhance biomass allocation to aboveground in an alpine steppe

Zheng

Peng

et al. 2019

Ecology and Evolution

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“…It plays an important role in formation of (NH 4 ) 2 SO 4 and NH 4 NO 3 aerosols (Seinfeld and Pandis, 2006). These secondary inorganic aerosols account for 40-57 % of the PM 2.5 concentrations in eastern China (Yang et al, 2011;Huang et al, 2014). Based on monthly mean molar concentrations, there were significant positive linear correlations between W. Xu et al: Spatial-temporal patterns of inorganic nitrogen air concentrations NH 3 and pNH + 4 , NO 2 and pNO − 3 , SO 2 and pSO 2− 4 , pNH + 4 and pNO − 3 , and pNH + 4 and pSO 2− 4 at all land use land types except for a non-significant relationship of NH 3 with pNH + 4 at background sites ( Fig.…”

Section: The Role Of Nh 3 In Mitigation Of N R Air Pollutionmentioning

confidence: 99%

Spatial–temporal patterns of inorganic nitrogen air concentrations and deposition in eastern China

Liu

Cheng

et al. 2018

Atmos. Chem. Phys.

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Abstract. Five-year (2011–2015) measurements of gaseous NH3, NO2, and HNO3 and particulate NH4+ and NO3− in air and/or precipitation were conducted at 27 sites in the Nationwide Nitrogen Deposition Monitoring Network (NNDMN) to better understand spatial and temporal (seasonal and annual) characteristics of reactive nitrogen (Nr) concentrations and deposition in eastern China. Our observations reveal annual average concentrations (16.4–32.6 µg N m−3), dry deposition fluxes (15.8–31.7 kg N ha−1 yr−1), and wet/bulk deposition fluxes (18.4–28.0 kg N ha−1 yr−1) based on land use, ranked as urban > rural > background sites. Annual concentrations and dry deposition fluxes of each Nr species in air were comparable at urban and background sites in northern and southern regions, but were significantly higher at northern rural sites. These results, together with good agreement between spatial distributions of NH3 and NO2 concentrations determined from ground measurements and satellite observations, demonstrate that atmospheric Nr pollution is heavier in the northern region than in the southern region. No significant inter-annual trends were found in the annual Nr dry and wet/bulk N deposition at almost all of the selected sites. A lack of significant changes in annual averages between the 2013–2015 and 2011–2012 periods for all land use types suggests that any effects of current emission controls are not yet apparent in Nr pollution and deposition in the region. Ambient concentrations of total Nr exhibited non-significant seasonal variation at all land use types, although significant seasonal variations were found for individual Nr species (e.g. NH3, NO2, and pNO3−) in most cases. In contrast, dry deposition of total Nr exhibited a consistent and significant seasonal variation at all land use types, with the highest fluxes in summer and the lowest in winter. Based on sensitivity tests by the GEOS-Chem model, we found that NH3 emissions from fertilizer use (including chemical and organic fertilizers) were the largest contributor (36 %) to total inorganic Nr deposition over eastern China. Our results not only improve the understanding of spatial–temporal variations of Nr concentrations and deposition in this pollution hotspot, but also provide useful information for policy-makers that mitigation of NH3 emissions should be a priority to tackle serious N deposition in eastern China.

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“…Increasing N deposition may be favorable to C sequestration in subtropical forests [23]. Atmospheric wet N deposition on the western edge of the Sichuan Basin (known as the "rainy zone of west China") is much higher than the mean value across China, as a result of rich rainfall and reactive N [24]. Previous studies have indicated that extremely high N additions (100 and 150 kg N ha −1 yr −1 ) constrained the litter decomposition rate in subtropical forests [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China

Zhuang

Liang

et al. 2020

Forests

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Litter decomposition plays a critical role in regulating biogeochemical cycles in terrestrial ecosystems and is profoundly impacted by increasing atmospheric nitrogen (N) deposition. Here, a N manipulation experiment was conducted to explore the effects of N additions (0 kg N ha−1 yr−1, 20 kg N ha−1 yr−1 and 40 kg N ha−1 yr−1) on decay rates and nutrients release of two contrasting species, the evergreen and nutrient-poor Michelia wilsonii and the deciduous and nutrient-rich Camptotheca acuminata, using a litterbag approach at the western edge of the Sichuan Basin of China. The decay rate and the mineralization of N and phosphorus (P) was faster in nutrient-rich C. acuminata litter than in nutrient-poor M. wilsonii litter, regardless of N regimes. N additions tended to decrease the decay constant (k value) in M. wilsonii litter, but had no effect on C. acuminata litter. N additions had no significant effects on carbon (C) release of both litter types. N additions showed negative effects on N and P release of M. wilsonii litter, particularly in the late decomposition stage. Moreover, for C. acuminata litter, N additions did not affect N release, but retarded P release in the late stage. N additions did not affect the C:N ratio in both litter types. However, N additions—especially high-N addition treatments—tended to reduce C:P and N:P ratios in both species. The effect of N addition on N and P remaining was stronger in M. wilsonii litter than in C. acuminata litter. The results of this study indicate that N additions retarded the nutrients release of two foliar litters. Thus, rising N deposition might favor the retention of N and P via litter decomposition in this specific area experiencing significant N deposition.

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Atmospheric nitrogen deposition in the Yangtze River basin: Spatial pattern and source attribution

Cited by 86 publications

References 72 publications

Precipitation and nitrogen addition enhance biomass allocation to aboveground in an alpine steppe

Precipitation and nitrogen addition enhance biomass allocation to aboveground in an alpine steppe

Spatial–temporal patterns of inorganic nitrogen air concentrations and deposition in eastern China

Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China

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