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United States Department of Agriculture

Agricultural Research Service

Research Project: MANAGEMENT TECHNOLOGIES FOR ARID RANGELANDS

Location: Range Management Research

Title: Long-term trends in precipitation and surface water chemistry)

Author
item Peters, Debra - Deb
item Laney, Christine
item Lugo, Ariel
item Collins, Scott
item Driscoll, Charles
item Groffman, Peter
item Grove, J. morgan
item Knapp, Alan
item Kratz, Timothy
item Ohman, Mark

Submitted to: Book Chapter
Publication Type: Book / chapter
Publication Acceptance Date: 10/15/2011
Publication Date: 11/20/2013
Citation: Peters, D.C., Laney, C.M., Lugo, A.E., Collins, S.L., Driscoll, C.T., Groffman, P.M., Grove, J., Knapp, A.K., Kratz, T.K., Ohman, M.D. 2013. Long-term trends in precipitation and surface water chemistry. In: Peters, D.P.C., Laney, C.M., Lugo, A.E., et al., editors. Long-Term Trends in Ecological Systems: A Basis for Understanding Responses to Global Change. U.S. Department of Agriculture, Agricultural Research Service, Technical Bulletin Number 1931. p. 115-161.

Interpretive Summary: This chapter first describes common methods to measure precipitation and surface water chemistry, and the rationale for the selection of variables in the book. It then shows graphs of long-term data summarized across sites and by site for two major elements (nitrogen, sulfur in precipitation as inputs; surface waters as exports). The continental-scale patterns for chloride and calcium and also shown. Volume-weighted concentration (mg/L) and area-based wet deposition (kg/ha) from precipitation, and concentration in surface water (mg/L) of nitrogen (as nitrate and ammonium), sulfur (as sulfate), chloride, and calcium are selected. Two types of graphs are included to show trends in the variables and to provide a sense of change across a range of spatial scales (continent, site) for each variable: maps at continental scale showing either the mean across years or the slope of the regression line (if significant) across time, and site-scale data through time. Nitrate and sulfate deposition are decreasing in many Eastern sites, consistent with efforts to control emissions of acid-causing nitrogen and sulfur from power plants in this part of the country.

Technical Abstract: This chapter shows long-term data and trends in precipitation and surface water chemistry for each site. It contains a brief introduction to the topic, and methods of measurements, selection of variables, and their data source. It consists primarily of a large number of figures showing long-term data for different variables. Volume-weighted concentration (mg/L) and area-based wet deposition (kg/ha) from precipitation, and concentration in surface water (mg/L) of nitrogen (as nitrate and ammonium), sulfur (as sulfate), chloride, and calcium are selected. Two types of graphs are included to show trends in the variables and to provide a sense of change across a range of spatial scales (continent, site) for each variable: maps at continental scale showing either the mean across years or the slope of the regression line (if significant) across time, and site-scale data through time. Nitrate and sulfate deposition are decreasing in many Eastern sites, consistent with efforts to control emissions of acid-causing nitrogen and sulfur from power plants in this part of the country.

Last Modified: 8/24/2016
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