SPARROW Modeling of Nitrogen Sources and Transport in Rivers and Streams of California and Adjacent States, U.S.

摘要: The SPARROW (SPAtially Referenced Regressions On Watershed attributes) model was used to evaluate the spatial distribution of total nitrogen (TN) sources, loads, watershed yields, and factors affecting transport decay in stream network California portions adjacent states for year 2002. two major TN sources local catchments on a mass basis were fertilizers manure (51.7%) wastewater discharge (15.9%). Other contributed < 12%. Fertilizer use is widespread Central Valley region California, also important several other regions because diversity agriculture. Precipitation, sand content surficial soils, wetlands, tile drains movement reaches. Median streamflow study area about 0.04 m3/s. Aquatic losses found be most intermittent small medium sized streams (0.2-14 m3/s), while larger showed less loss, therefore are transport. Nitrogen loss reservoirs insignificant, possibly ones located upstream sources. show loadings, tributary inputs rivers. information provided by useful determining both contributing specific tributaries that load.