Long‐term changes in soil pH across major forest ecosystems in China

Yang, Yuanhe; Пин, Ли; He, Honglin; Zhao, Xia; Datta, Arindam; Ma, Wenqi; Zhang, Ying; Liu, Xuejun; Han, Wenxuan; Wilson, Maxwell C.; Fang, Jingyun

doi:10.1002/2014gl062575

Cited by 69 publications

(37 citation statements)

References 44 publications

(73 reference statements)

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“…3a) are most likely due to enhanced NH 3 emissions from natural and fertilized soils, and biological sources such as humans, sewage systems, and organic waste in garbage containers (Chang et al, 2016;Meng et al, 2018). Zhang et al (2018) showed that NH 3 emissions in China show a strong summer peak, with emissions about 50 % higher in summer than spring and autumn. The lowest concentrations of NH 3 , in winter (Fig.…”

Section: Seasonal Variations Of N R Concentration and Depositionmentioning

confidence: 99%

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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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Section: Seasonal Variations Of N R Concentration and Depositionmentioning

confidence: 99%

“…Future work based on improved NH 3 emission inventories (e.g. Zhang et al, 2018) and including bidirectional ammonia exchange with the surface is essential to better examine source attribution of N deposition in China.…”

Section: Uncertainties and Limitationsmentioning

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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“…Soil pH will reduce results from an increase in nitrogen deposition [28], which has been occurring on the Tibetan Plateau [50]. Therefore, soil pH has a trend of decreasing, which may promote an increase in soil N.…”

Section: Relationship Between Soil N Density and Soil Phmentioning

confidence: 99%

Soil Nitrogen Storage, Distribution, and Associated Controlling Factors in the Northeast Tibetan Plateau Shrublands

Nie

Xiong

Yang

et al. 2017

Forests

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Abstract:Although the soils in the Tibetan Plateau shrublands store large amounts of total nitrogen (N), the estimated values remain uncertain because of spatial heterogeneity and a lack of field observations. In this study, we quantified the regional soil N storage, spatial and vertical density distributions, and related climatic controls using 183 soil profiles sampled from 61 sites across the Northeast Tibetan Plateau shrublands during the period of 2011-2013. Our analysis revealed a soil N storage value of 132.40 Tg at a depth of 100 cm, with an average density of 1.21 kg m −2 . Soil N density was distributed at greater levels in alpine shrublands, compared with desert shrublands. Spatially, soil N densities decreased from south to north and from east to west, and, vertically, the soil N in the upper 30 and 50 cm accounted for 42% and 64% of the total soil N stocks in the Tibetan Plateau. However, compared with desert shrublands, the surface layers in alpine shrublands exhibited a larger distribution of soil N stocks. Overall, the soil N density in the top 30 cm increased significantly with the mean annual precipitation (MAP) and tended to decrease with the mean annual temperature (MAT), although the dominant climatic controls differed among shrubland types. Specifically, MAP in alpine shrublands, and MAT in desert shrubland, had a weak effect on N density. Soil pH can significant affect soil N density in the Tibetan Plateau shrublands. In conclusion, changes in soil N density should be monitored over the long term to provide accurate information about the effects of climatic factors.

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“…For instance, a major concern has emerged regarding soil acidification in intensive agricultural cropland systems in China, mainly due to the overuse of fertilizer application for pursuing high agricultural production to meet increasing demands for food (Guo et al 2010;Yang et al 2012). Soil acidification induced by N deposition also occurred in coniferous and mixed coniferous and broadleaved forests (Yang et al 2015). In some intensive agricultural ecosystems, such as in wheat-maize cropping systems in a major grain production zone, excessive nitrogen application could decrease grain yield and could easily lead to nitrogen loss, which could result in environmental contamination (Wang et al 2011;Xu et al 2013;Lu et al 2014).…”

Section: Effects Of N Deposition and Consequences Of Excessive N Addimentioning

confidence: 99%

Nitrogen cycles in terrestrial ecosystems: climate change impacts and mitigation

Jiang

Zhou

2016

Environ. Rev.

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The nitrogen (N) cycle and N balance have primarily been modified by anthropogenic activities and environmental changes at various scales, including biological individual, ecosystem, local landscape, continental region, and global. These modifications have drastically affected the structures and functions of natural and agricultural ecosystems in terrestrial and aquatic areas. In this manuscript, we first present a modified view of the global N cycle that includes N transport, conversion, and exchange processes. Second, several crucial issues concerning N balance, including N deposition and excessive addition and the dynamics of N and other nutrients, are reviewed. Third, the effects of climate change factors, including water status, warming, and elevated CO2 concentrations, on N balance and the N cycle and their interactions within and with other environmental factors are outlined. Finally, intervention strategies for improving N balance and N cycling to address rapid continual climatic change and socio-economic development are presented and discussed. It is highlighted that the altered N balance and N cycle between the geosphere, biosphere, and atmosphere have produced the profoundly critical challenge of maintaining N levels within an appropriate range, which should be considered by relevant people and sectors, including researchers, managers, and policy makers from ecological, environmental, and sustainable development sectors.

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Long‐term changes in soil pH across major forest ecosystems in China

Cited by 69 publications

References 44 publications

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

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

Soil Nitrogen Storage, Distribution, and Associated Controlling Factors in the Northeast Tibetan Plateau Shrublands

Nitrogen cycles in terrestrial ecosystems: climate change impacts and mitigation

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