DOI: 10.1007/s10533-014-9998-6
Scopus记录号: 2-s2.0-84907604813
论文题名: Climate variability masks the impacts of land use change on nutrient export in a suburbanizing watershed
作者: Morse N.B. ; Wollheim W.M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 121, 期: 1 起始页码: 45
结束页码: 59
语种: 英语
英文关键词: Aquatic processing
; Long-term change
; Nitrogen
; Nutrient
; Phosphorus
; Seasonality
; Suburbanization
; Watershed
Scopus关键词: aquatic ecosystem
; climate variation
; land use change
; long-term change
; nitrogen cycle
; nutrient cycling
; phosphorus
; seasonality
; suburbanization
; watershed
; Ipswich Basin
; Massachusetts
; Parker Basin
; United States
英文摘要: Suburbanization negatively impacts aquatic systems by altering hydrology and nutrient loading. These changes interact with climate and aquatic ecosystem processes to alter nutrient flux dynamics. We used a long term data set (1993–2009) to investigate the influence of suburbanization, climate, and in-stream processes on nitrogen and phosphorus export in rivers draining the Ipswich and Parker River watersheds in northeastern MA, USA. During this timeframe population density increased in these watersheds by 14 % while precipitation varied by 46 %. We compared nutrient export patterns from the two larger watersheds with those from two nested headwater catchments collected over a nine year period (2001–2009). The headwater catchments were of contrasting, but stable, land uses that dominate the larger watersheds (suburban and forested). Despite ongoing land use change and an increase in population density in the mainstem watersheds, we did not detect an increase in dissolved inorganic nitrogen (DIN) or PO4 concentration or export over the 16-year time period. Inter-annual climate and associated runoff variability was the major control. Annual DIN and PO4 export increased with greater annual precipitation in the Ipswich and the Parker River watersheds, as well as the forested headwater catchment. In contrast, annual DIN export fluxes from the suburban headwater catchment were less affected by precipitation variability, with inter-annual export fluxes negatively correlated with mean annual temperature. The larger watershed exports diverged from headwater exports, particularly during summer, low-flow periods, suggesting retention of DIN and PO4 . Our study shows suburban headwater exports respond to inter-annual variation in runoff and climate differently than forested headwater exports, but the impacts from headwater streams could be buffered by the river network. The net effect is that inter-annual variation and network buffering can mitigate higher nutrient exports from larger suburbanizing watersheds over decadal time periods. © 2014, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83705
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Natural Resources and the Environment, University of New Hampshire, 208 Morse Hall, 8 College Rd, Durham, NH, United States; Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States
Recommended Citation:
Morse N.B.,Wollheim W.M.. Climate variability masks the impacts of land use change on nutrient export in a suburbanizing watershed[J]. Biogeochemistry,2014-01-01,121(1)