Net anthropogenic nitrogen inputs (NANI) index application in Mainland China

Han, Yanni; Fan, Yu; Yang, Peiling; Wang, Xiaoxue; Wang, Yujie; Tian, Jinxia; Xu, Lei; Wang, Chengzhi

doi:10.1016/j.geoderma.2013.07.019

Cited by 99 publications

(91 citation statements)

References 34 publications

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“…As the most developed area in China, with an extremely high population density and economic output, the huge NANI value for the Lake Taihu basin is not surprising. This finding provides further evidence that the NANI in China is mainly driven by population and economic output (Han et al 2014). However, the NANI calculations for the Lake Chaohu basin, which was the least developed, also yielded a relatively high N input.…”

Section: Human Influence On N Input Into Diverse Chinese Lake Basinsmentioning

confidence: 55%

“…In China, N fertilizer use is the single largest source of anthropogenic N input, dominating most areas in Eastern and Middle China (Han et al 2014). In this study, mineral N fertilizers are still the most significant direct N inputs in all three basins (Fig.…”

Section: Main Drivers Behind N Input From Human Activitiesmentioning

confidence: 68%

“…2), which is much higher than the average for China and the world (Billen et al 2013;Han et al 2014). The N input into the Lake Taihu basin significantly outweighs the other two basins, with almost twice their values.…”

Section: Human Influence On N Input Into Diverse Chinese Lake Basinsmentioning

confidence: 76%

“…For larger lakes over 10 km 2 in area, freshwater lakes make up 35 % of the total lake area, and have an average depth of approximately 2 m. Before the 1980s, most freshwater lakes had relatively good water quality and were eligible for drinking (Le et al 2010). However, since China's rapid economic development in the 1980s, human-induced nutrient inputs have increased substantially (Han et al 2013(Han et al , 2014, and a majority of freshwater lakes have experienced a substantial reduction in water quality and ecosystem functionality (Gao and Zhang 2010;Liu et al 2012). One common problem for most lakes is elevated levels of total nitrogen (TN), total phosphorus (TP), and other organic pollutant concentrations, which are mainly caused by expanding populations and agricultural fertilizer inputs (Le et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The NANI model is a quasi-mass balance approach that estimates human-induced N inputs on the regional scale using conventional agricultural, social, and economic statistical data. This methodology was introduced by Howarth et al (1996) and has been applied to various watersheds over several spatial scales and climatic regions Han et al 2014).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Evaluating anthropogenic N inputs to diverse lake basins: A case study of three Chinese lakes

Gao

Swaney

Hong

et al. 2015

Ambio

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The environmental degradation of lakes in China has become increasingly serious over the last 30 years and eutrophication resulting from enhanced nutrient inputs is considered a top threat. In this study, a quasi-mass balance method, net anthropogenic N inputs (NANI), was introduced to assess the human influence on N input into three typical Chinese lake basins. The resultant NANI exceeded 10 000 kg N km -2 year -1 for all three basins, and mineral fertilizers were generally the largest sources. However, rapid urbanization and shrinking agricultural production capability may significantly increase N inputs from food and feed imports. Higher percentages of NANI were observed to be exported at urban river outlets, suggesting the acceleration of NANI transfer to rivers by urbanization. Over the last decade, the N inputs have declined in the basins dominated by the fertilizer use but have increased in the basins dominated by the food and feed import. In the foreseeable future, urban areas may arise as new hotspots for nitrogen in China while fertilizer use may decline in importance in areas of high population density.

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Section: Human Influence On N Input Into Diverse Chinese Lake Basinsmentioning

confidence: 55%

Section: Main Drivers Behind N Input From Human Activitiesmentioning

confidence: 68%

Section: Human Influence On N Input Into Diverse Chinese Lake Basinsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluating anthropogenic N inputs to diverse lake basins: A case study of three Chinese lakes

Gao

Swaney

Hong

et al. 2015

Ambio

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A dynamic watershed model for determining the effects of transient storage on nitrogen export to rivers

Chen

Dahlgren

2014

Water Resources Research

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Legacy anthropogenic nitrogen (N) has been suggested as a major cause for increasing riverine N exports despite significant declines in anthropogenic N inputs in many regions. However, little quantitative knowledge exists concerning the contribution of the legacy N pool to riverine N export. This study developed a dynamic watershed N delivery model to address the role of transient storage of anthropogenic N inputs on riverine N flux. Employing simple mass balance and equivalent substitution rules, the model expresses the transient storage of legacy N mass with a term that combines the previous one year's riverine total N (TN) flux, relevant explanatory variables, and unknown parameters, enabling us to inversely calibrate the model parameters from measurable variables using Bayesian statistics. The model efficacy was demonstrated through application to the Yong'an River watershed in eastern China based on a 31 year record of riverine TN fluxes. The model can quantify annual transient storage of legacy N and its resulting contribution to annual riverine N flux. The model also allows partitioning of the complete longterm mass balance for the fate (e.g., transient storage, riverine export, and loss/retention by denitrification, biomass uptake and wood product export) of annual anthropogenic N inputs. To further improve the model, various N input-output processes can be specified and long-term measurements of N fates are required to further verify the model results. This study demonstrates the need to consider transient storage effects as an improvement to current watershed models and for developing and assessing N pollution control measures.

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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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Net anthropogenic nitrogen inputs (NANI) index application in Mainland China

Cited by 99 publications

References 34 publications

Evaluating anthropogenic N inputs to diverse lake basins: A case study of three Chinese lakes

Evaluating anthropogenic N inputs to diverse lake basins: A case study of three Chinese lakes

A dynamic watershed model for determining the effects of transient storage on nitrogen export to rivers

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

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