Evaluation of the phosphorus index in watersheds at the regional scale

被引:36
作者
Birr, AS [1 ]
Mulla, DJ [1 ]
机构
[1] Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA
关键词
D O I
10.2134/jeq2001.2018
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Agricultural losses of phosphorus (P) in runoff are a primary cause of eutrophication in many freshwater systems. A modified version of the P Index originally developed jointly by the USDA (Agricultural Research Service [ARS], Cooperative State Research, Education, and Extension Service [CSREES], and Natural Resources Conservation Service [NRCS]) was used to prioritize P loss vulnerability at the regional scale from 60 watersheds located within Minnesota using readily available data related to the transport and sources of P. This modified version of the P Index was created for a regionally based analysis of the index. Validation of the P Index rating was conducted using long-term water quality monitoring data consisting of total P concentrations collected from watersheds and lakes. The modified version of the P Index produced a strong correlation between P Index rating and total P stream monitoring data in watersheds (r(2) = 0.70) excluding the Red River Basin. An equally strong relationship was observed between P Index rating and lake water quality (r(2) = 0.68) using the modified P Index. The P Index ratings for the Red River Basin showed good correlation with observed total P stream monitoring data (r(2) = 0.51); however, the P Index ratings were smaller than in other basins. The results of this study suggest that, with certain limitations, the P Index can be used at the regional scale to prioritize P loss vulnerability using state and national databases. Regional P Index ratings represent the average risk for agricultural land within the entire watershed.
引用
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页码:2018 / 2025
页数:8
相关论文
共 31 条
[1]  
[Anonymous], N CENTRAL REGIONAL R
[2]   Agricultural-nitrogen contributions to hypoxia in the Gulf of Mexico [J].
Burkart, MR ;
James, DE .
JOURNAL OF ENVIRONMENTAL QUALITY, 1999, 28 (03) :850-859
[3]  
*ENV SYST RES I, 2000, ARC INF VERS 8 0 1
[4]  
*ENV SYST RES I, 2000, ARCV VERS 3 1
[5]  
Fixen P. E., 1998, Better Crops with Plant Food, V82, P16
[6]  
Gibson C. E., 1997, P119
[7]  
HAMLETT JM, 1992, J SOIL WATER CONSERV, V47, P399
[8]  
HEISKARY SA, 2000, MINNESOTA LAKE WATER
[9]  
HOBBS HC, 1982, GEOLOGIC MAP MINN S, V1
[10]   THE CONCEPT AND NEED FOR A PHOSPHORUS ASSESSMENT-TOOL [J].
LEMUNYON, JL ;
GILBERT, RG .
JOURNAL OF PRODUCTION AGRICULTURE, 1993, 6 (04) :483-486