Spatial and temporal variation in phosphorus budgets for 24 watersheds in the Lake Erie and Lake Michigan basins

Han, Henry; Bosch, Nathan S.; Allan, J. David

doi:10.1007/s10533-010-9420-y

Cited by 86 publications

(86 citation statements)

References 30 publications

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“…4a), since the high flow regime mainly occurs in the summer when high temperature and sunlight contribute to algae growth . As expected, annual riverine TP flux was significantly correlated with NAPI, consistent with previous studies (Borbor-Cordova et al, 2006;Russell et al, 2008;Han et al, 2011a;Hong et al, 2012). Similar to NAPI, both NAPI AF and NAPI R presented significant correlations with riverine TP flux ( Table 2).…”

Section: Response Of Riverine Tp Export To Changes In Phosphorus Budgetssupporting

confidence: 90%

“…This estimate falls within the range reported for many studies in American, European and Chinese watersheds (i.e., 1-38%, David and Gentry, 2000;Borbor-Cordova et al, 2006;Russell et al, 2008;Han et al, 2011a;Sobota et al, 2011;Hong et al, 2012;Chen et al, 2015a). Of cumulative riverine TP flux (12.0 kg P ha À1 ) over the 32-yr period, 48% was derived from the agricultural/forest system, while 52% originated from the residential system.…”

Section: Fates Of Surplus Phosphorussupporting

confidence: 85%

“…Calculation of net anthropogenic phosphorus input (NAPI) is a P budgeting approach that sums annual P contributions from atmospheric deposition, fertilizer application, non-food input (i.e., detergent P), seed input, and net import/export in animal feed and human food supplies (Han et al, 2013). The NAPI approach has been successfully applied to many watersheds across Asia (Han et al, 2011b(Han et al, , 2013Chen et al, 2015a), the Americas (David and Gentry, 2000;Borbor-Cordova et al, 2006;Han et al, 2011a;Russell et al, 2008;Sobota et al, 2011), and Europe (Hong et al, 2012). It is a simple yet powerful approach to evaluate net P inputs from anthropogenic sources to terrestrial ecosystems, as well as an effective tool to explain among-watershed or among-year variations in riverine P exports.…”

Section: Introductionmentioning

confidence: 99%

“…It is commonly observed that years with higher precipitation or river discharge export a higher fraction of NAPI via rivers (Borbor-Cordova et al, 2006;Russell et al, 2008;Han et al, 2011a;Sobota et al, 2011;Hong et al, 2012;Chen et al, 2015a), and agricultural watersheds with tile drainage generally export a higher fraction of NAPI (Gentry et al, 2007;Han et al, 2011a;Morse and Wollheim, 2014). In addition, legacy P (i.e., surplus P stored in watershed landscapes that is derived from anthropogenic P inputs in previous years) can be remobilized or recycled after land management change (Meals et al, 2010;Sharpley et al, 2013) or when the degree of landscape P saturation increases after longterm excessive P addition (Kleinman et al, 2011), yielding a considerable P flux to downstream waterbodies Haygarth et al, 2014;Chen et al, 2015a).…”

Section: Introductionmentioning

confidence: 99%

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Factors controlling phosphorus export from agricultural/forest and residential systems to rivers in eastern China, 1980–2011

Chen

Wang

et al. 2016

Journal of Hydrology

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s u m m a r yThis study quantified long-term response of riverine total phosphorus (TP) export to changes in land-use, climate, and net anthropogenic phosphorus inputs to agricultural/forest (NAPI AF ) and residential (NAPI R ) systems for the upper Jiaojiang watershed in eastern China. Annual NAPI AF rose by 73% in 1980-1999 followed by a 41% decline in 2000-2011, while NAPI R continuously increased by 122% over the 1980-2011 period. Land-use showed a 63% increase in developed land area (D%) and a 91% increase in use of efficient drainage systems on agricultural land area (AD%) over the study period. Although no significant trends were observed in annual river discharge or precipitation, the annual number of storm events rose by 90% along with a 34% increase in the coefficient of variation of daily rainfall. In response to changes of NAPI AF , NAPI R , land-use and precipitation patterns, riverine TP flux increased 16.0-fold over the 32-year record. Phosphorus export via erosion and leaching was the dominant pathway for P delivery to rivers. An empirical model incorporating annual NAPI AF , NAPI R , precipitation, D%, and AD% was developed (R 2 = 0.96) for apportioning riverine TP sources and predicting annual riverine TP fluxes. The model estimated that NAPI AF , NAPI R and legacy P sources contributed 19-56%, 16-67% and 13-32% of annual riverine TP flux in 1980-2011, respectively. Compared to reduction of NAPI AF , reduction of NAPI R was predicted to have a greater immediate impact on decreasing riverine TP fluxes. Changes in anthropogenic P input sources (NAPI AF vs. NAPI R ), land-use, and precipitation patterns as well as the legacy P source can amplify P export from landscapes to rivers and should be considered in developing P management strategies to reduce riverine P fluxes.

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Section: Response Of Riverine Tp Export To Changes In Phosphorus Budgetssupporting

confidence: 90%

Section: Fates Of Surplus Phosphorussupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Factors controlling phosphorus export from agricultural/forest and residential systems to rivers in eastern China, 1980–2011

Chen

Wang

et al. 2016

Journal of Hydrology

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“…Impacts of nutrient loading on coastal water quality and ecological function are significant and associated with eutrophication, hypoxic (''dead'') zones, harmful algal bloom development, and declines in the economic value and ecosystem services of coastal areas (Anderson et al 2002;Smith 2003;Diaz and Rosenberg 2008). While magnitudes vary widely, both N and P loads can be largely attributed to agricultural sources and the waste streams from food consumption (Howarth et al 1996Han et al 2011;Russell et al 2008). In watersheds with substantial crop production, the regional exports of food and livestock feed that drive the economy are associated with inputs of fertilizer that can contribute to excess nutrient loads to regional waters.…”

Section: Introductionmentioning

confidence: 99%

Advances in NANI and NAPI accounting for the Baltic drainage basin: spatial and temporal trends and relationships to watershed TN and TP fluxes

et al. 2017

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In order to assess the progress toward eutrophication management goals, it is important to understand trends in land-based nutrient use. Here we present net anthropogenic nitrogen and phosphorus inputs (NANI and NAPI, respectively) for 2000 and 2010 for the Baltic Sea watershed. Overall, across the entire Baltic, between the 5-year periods centered on 2000 and 2010, NANI and NAPI decreased modestly by -6 and -4%, respectively, but with substantial regional variation, including major increases in the Gulf of Riga drainage basin (?19 and ?58%, respectively) and decreases in the Danish Straits drainage basin (-25 and -40% respectively). The changes were due primarily to changes in mineral fertilizer use. Mineral fertilizers dominated inputs, at 57% of both NANI and NAPI in 2000, increasing to 68 and 70%, respectively, by 2010. Net food and feed imports declined over that period, corresponding to increased crop production; either fewer imports of food and feedstocks were required to feed humans and livestock, or more of these commodities were exported. A strong linear relationship exists between regional net nutrient inputs and riverine nutrient fluxes for both periods. About 17% of NANI and 4.7% of NAPI were exported to the sea in 2000; these relationships did not significantly differ from those for 2010. Changes in NANI from 2000 to 2010 across basins were directly proportional rather than linearly related to changes in total N (TN) fluxes to the sea (i.e., -017-0330-0 no change in NANI suggests no change in TN flux). Similarly, for all basins except those draining to the Baltic Proper, changes in NAPI were proportional to changes in total P (TP) fluxes. The Danish Straits decreased most between 2000 and 2010, where NANI and NAPI declined by 25 and 40%, respectively, and corresponding fluxes of TN and TP declined 31 and 18%, respectively. For the Baltic Proper, NAPI was relatively unchanged between 2000 and 2010, while riverine TP fluxes decreased 25%, due possibly to lagged effects of fertilizer reduction resulting from socio-political changes in the early 1990s or improvements in sewage treatment capabilities. For most regions, further reductions in NANI and NAPI could be achieved by more efficient production and greater substitution of manure for imported mineral fertilizers.123 Biogeochemistry (2017) 133:245-261 DOI 10.1007/s10533

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Nitrogen and phosphorus fluxes from watersheds of the northeast U.S. from 1930 to 2000: Role of anthropogenic nutrient inputs, infrastructure, and runoff

Hale

Grimm

Vörösmarty

et al. 2015

Global Biogeochemical Cycles

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An ongoing challenge for society is to harness the benefits of nutrients, nitrogen (N) and phosphorus (P), while minimizing their negative effects on ecosystems. While there is a good understanding of the mechanisms of nutrient delivery at small scales, it is unknown how nutrient transport and processing scale up to larger watersheds and whole regions over long time periods. We used a model that incorporates nutrient inputs to watersheds, hydrology, and infrastructure (sewers, wastewater treatment plants, and reservoirs) to reconstruct historic nutrient yields for the northeastern U.S. from 1930 to 2002. Over the study period, yields of nutrients increased significantly from some watersheds and decreased in others. As a result, at the regional scale, the total yield of N and P from the region did not change significantly. Temporal variation in regional N and P yields was correlated with runoff coefficient, but not with nutrient inputs. Spatial patterns of N and P yields were best predicted by nutrient inputs, but the correlation between inputs and yields across watersheds decreased over the study period. The effect of infrastructure on yields was minimal relative to the importance of soils and rivers. However, infrastructure appeared to alter the relationships between inputs and yields. The role of infrastructure changed over time and was important in creating spatial and temporal heterogeneity in nutrient input-yield relationships.

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Spatial and temporal variation in phosphorus budgets for 24 watersheds in the Lake Erie and Lake Michigan basins

Cited by 86 publications

References 30 publications

Factors controlling phosphorus export from agricultural/forest and residential systems to rivers in eastern China, 1980–2011

Factors controlling phosphorus export from agricultural/forest and residential systems to rivers in eastern China, 1980–2011

Advances in NANI and NAPI accounting for the Baltic drainage basin: spatial and temporal trends and relationships to watershed TN and TP fluxes

Nitrogen and phosphorus fluxes from watersheds of the northeast U.S. from 1930 to 2000: Role of anthropogenic nutrient inputs, infrastructure, and runoff

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