Spatio-temporal variation of net anthropogenic nitrogen inputs in the upper Yangtze River basin from 1990 to 2012

Ai, Wang; Tang, Lihua; Yang, Dawen; Lei, Huimin

doi:10.1007/s11430-016-0014-6

Cited by 26 publications

(6 citation statements)

References 34 publications

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“…In the lower reaches, the focus should be on the impacts of urbanization on agricultural production. These conclusions are in accord with a study of net anthropogenic N inputs in the upper Yangtze River Basin, in which fertilizer N input decreased with increased urbanization in the city of Chengdu [ 50 ]. The strictest farmland protection system should be implemented to prevent the decline of arable land and basic farmland area, it plays an important role in farmland protection.…”

Section: Discussionsupporting

confidence: 89%

Nitrogen balance dynamics during 2000-2010 in the Yangtze River Basin croplands, with special reference to the relative contributions of cropland area and synthetic fertilizer N application rate changes

et al. 2017

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With the increases of cropland area and fertilizer nitrogen (N) application rate, general N balance characteristics in regional agroecosystems have been widely documented. However, few studies have quantitatively analyzed the drivers of spatial changes in the N budget. We constructed a mass balance model of the N budget at the soil surface using a database of county-level agricultural statistics to analyze N input, output, and proportional contribution of various factors to the overall N input changes in croplands during 2000–2010 in the Yangtze River Basin, the largest basin and the main agricultural production region in China. Over the period investigated, N input increased by 9%. Of this 87% was from fertilizer N input. In the upper and middle reaches of the basin, the increased synthetic fertilizer N application rate accounted for 84% and 76% of the N input increase, respectively, mainly due to increased N input in the cropland that previously had low synthetic fertilizer N application rate. In lower reaches of the basin, mainly due to urbanization, the decrease in cropland area and synthetic fertilizer N application rate nearly equally contributed to decreases in N input. Quantifying spatial N inputs can provide critical managerial information needed to optimize synthetic fertilizer N application rate and monitor the impacts of urbanization on agricultural production, helping to decrease agricultural environment risk and maintain sustainable agricultural production in different areas.

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Section: Discussionsupporting

confidence: 89%

Nitrogen balance dynamics during 2000-2010 in the Yangtze River Basin croplands, with special reference to the relative contributions of cropland area and synthetic fertilizer N application rate changes

et al. 2017

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“…This indicates that the construction of reservoirs contributes to the development of society and the economy, but they can also cause environmental degradation. Moreover, it has been demonstrated that anthropogenic fertilizer application increases with GDP growth in the Yangtze River [48].…”

Section: Discussionmentioning

confidence: 99%

Three Gorges Dam Operation Altered Networks of Social–Economic–Ecological System in the Yangtze River Basin, China

Liu

Bao

et al. 2023

Sustainability

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It is necessary to review changes in the interactions of indicators following the construction of the Three Gorges Dam (TGD) in order to explore the impact of the dam on ecology. Research on changes in interactions among indicators of the comprehensive social–economic–ecology system in the Yangtze River Basin is limited, and the objective of this study was to investigate how this system changed after the operation of the TGD, as well as how the indicators contributed to this change. Here, the correlational network approach using 38 data point indicators from 1949 to 2018 of the Yangtze River Basin was applied to analyze the changes in indicator interactions before and after the TGD operation. The TGD impoundment altered networks of the social–economic–ecological system in the Yangtze River Basin. Indicators are both less positively and less negatively connected. The number of synergy and trade-off networks clusters changed from two (Modularity = 0.33) to -six (Modularity = 0.23) and from two (Modularity = 0.015) to four (Modularity = 0.34) after the TGD operation, indicating that the sustainable development of the Yangtze River Basin might be at a middle level after the TGD operation. Further analysis revealed that the mean annual discharge, downstream fry runoff, and downstream counts of the eggs and larvae of four carp, diatom abundance index, breeding population of Chinese sturgeon, and annual precipitation contributed more to the changes in the networks after 2003.

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“…The N flux and NANI for the Murray River basin were evaluated in this study. N fluxes for the Mississippi River basin were simulated using 2012 SPARROW Models conducted by the U.S. Geological Survey (USGS), and the NANI was adopted from the work of McIsaac et al N fluxes for the Yangtze River basin originated from the work of Wang et al, while the NANI was derived from Wang et al The average of 154 global watersheds were summarized by Howarth et al The dots in Figure b present pollution patterns of small regions composing the river basins. For the Murray, Mississippi, and Yangtze Rivers, the regions were defined as secondary river basins, states, and provinces, respectively.…”

Section: Materials and Methodsmentioning

confidence: 99%

Dry Climate Aggravates Riverine Nitrogen Pollution in Australia by Water Volume Reduction

Sun

Zhang

Reis

et al. 2021

Environ. Sci. Technol.

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Freshwater is a scarce resource, and maintaining water quality is of great importance in dryland Australia. How water quality is affected by the dry climate and socio-economic influences in Australia remains widely unknown. Here, we find that agriculture activity dominates reactive nitrogen (Nr) emissions to water bodies. Such emissions not only contribute to deteriorating water quality in Southeastern Australia but also harm marine ecosystems, including the Great Barrier Reef, a World Natural Heritage site. A dry and warm climate reduces the share of Nr emitted directly to water bodies; however, it increases the Nr concentration in surface water due to reduced water volume, leading to a 3-fold higher water Nr concentration compared to major rivers globally, e.g., in the US or China. Business-as-usual socioeconomic development would increase the total Nr emitted to surface water by at least 43% by 2050, while effective mitigation measures could reduce N runoff by about 27%. Advanced agricultural management strategies should be considered to reduce future environmental pressures due to N runoff in Australia.

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Spatio-temporal variation of net anthropogenic nitrogen inputs in the upper Yangtze River basin from 1990 to 2012

Cited by 26 publications

References 34 publications

Nitrogen balance dynamics during 2000-2010 in the Yangtze River Basin croplands, with special reference to the relative contributions of cropland area and synthetic fertilizer N application rate changes

Nitrogen balance dynamics during 2000-2010 in the Yangtze River Basin croplands, with special reference to the relative contributions of cropland area and synthetic fertilizer N application rate changes

Three Gorges Dam Operation Altered Networks of Social–Economic–Ecological System in the Yangtze River Basin, China

Dry Climate Aggravates Riverine Nitrogen Pollution in Australia by Water Volume Reduction

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