气候变化领域集成服务门户(CCPortal): Phosphorus flows and legacy accumulation in an animal-dominated agricultural region from 1925 to 2012

CCPortal

DOI	10.1016/j.gloenvcha.2018.02.017
	Phosphorus flows and legacy accumulation in an animal-dominated agricultural region from 1925 to 2012
	Wironen M.B.; Bennett E.M.; Erickson J.D.
发表日期	2018
ISSN	0959-3780
起始页码	88
结束页码	99
卷号	50
英文摘要	Phosphorus (P) is a scarce but critical input for agriculture, yet its overuse can lead to water quality degradation. Most P applied as fertilizer and manure binds to soils, accumulating over time, constituting a legacy source with implications for mitigating nutrient pollution. To investigate how the flows and balance of P evolved over a period of rapidly changing technology, agricultural practices, and land cover, we modeled P flows in Vermont's dairy-dominated agricultural system at county- and state-levels from 1925 to 2012. An important dairy exporter, Vermont faces water quality challenges complicated by a mismatch between the scale of the market and that of policymaking, a common occurrence in export-oriented agricultural regions. Over the period analyzed, agricultural soils accumulated at >1000 tonnes of P annually, accruing a legacy stock >230,000 tonnes. The peak surplus of 4439 tonnes occurred in 1950, declining to 1493 tonnes per annum in 2012. Legacy P accumulation at the state-level ranged from <1 to> 16 kg ha−1, depending on year and measurement method. The decline in total P surplus reflects an 82% decline in fertilizer use that was partly offset by an increase in animal feed imports, the largest source of P entering Vermont since 1982. Despite declining inputs, milk output doubled, evidence of increased P use efficiency. Simultaneously, animal unit density increased by >250%, enabled by rising feed imports. While feed is imported and milk exported, manure remains in Vermont; hence, Vermont soils continue to accrue legacy P at rates > 5 kg ha−1, undermining efforts to reduce P runoff and achieve water quality targets. We discuss the governance, management, and policy implications, outlining opportunities to improve input accountability to address the persistent P imbalance. We highlight constraints facing regional policymakers due to increased embeddedness in commodity trade networks. © 2018 Elsevier Ltd
英文关键词	Agriculture; Legacy P; Material flow analysis; Nonpoint source pollution; Nutrient management; Phosphorus
学科领域	agricultural ecosystem; agricultural management; agricultural soil; bioaccumulation; material flow analysis; measurement method; nonpoint source pollution; nutrient use efficiency; phosphorus; policy making; pollutant removal; water quality; Animalia
语种	英语
scopus关键词	agricultural ecosystem; agricultural management; agricultural soil; bioaccumulation; material flow analysis; measurement method; nonpoint source pollution; nutrient use efficiency; phosphorus; policy making; pollutant removal; water quality; Animalia
来源期刊	Global Environmental change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/117147
作者单位	Gund Institute for Environment, University of Vermont, Johnson House, 617 Main St. BurlingtonVT 05405, United States; Rubenstein School of Environment and Natural Resources, University of Vermont, Aiken Center, 81 Carrigan Dr. BurlingtonVT 05405, United States; McGill School of Environment and Department of Natural Resource Sciences, McGill University, 21111 Lakeshore Rd Ste-Anne-de-BellevueQC H9X 3V9, Canada
推荐引用方式 GB/T 7714	Wironen M.B.,Bennett E.M.,Erickson J.D.. Phosphorus flows and legacy accumulation in an animal-dominated agricultural region from 1925 to 2012[J],2018,50.
APA	Wironen M.B.,Bennett E.M.,&Erickson J.D..(2018).Phosphorus flows and legacy accumulation in an animal-dominated agricultural region from 1925 to 2012.Global Environmental change,50.
MLA	Wironen M.B.,et al."Phosphorus flows and legacy accumulation in an animal-dominated agricultural region from 1925 to 2012".Global Environmental change 50(2018).