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[1]CHENG Jie-min,SONG Tao,LI Yan.Estimation of Nitrogen and Phosphorus Loading of Agricultural Non-point Sources along Nansi Lake Based on GIS[J].Research of Soil and Water Conservation,2012,19(03):284-288.

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Estimation of Nitrogen and Phosphorus Loading of Agricultural Non-point Sources along Nansi Lake Based on GIS

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 19 Number of periods: 2012 03 Page number: 284-288 Column: Public date: 2012-06-20

Title:: Estimation of Nitrogen and Phosphorus Loading of Agricultural Non-point Sources along Nansi Lake Based on GIS

Author(s):: CHENG Jie-min¹, SONG Tao¹, LI Yan²; 1. College of Population Resources and Environment, Shandong Normal University, Ji’nan 250014, China;
2. Institute of Soil and Fertilizer, Shandong Agricultural Sciences Academy, Ji’nan 250014, China

Keywords:: GIS; loss of nitrogen and phosphorus; agricultural sources; Nansi Lake

CLC:: X524

DOI:: -

Abstract:: In this paper, the counties and towns in Ji’ning City along the Nansi Lake shore were selected as the main study area. The factors of Universal Soil Loss Equation (USLE) were determined by runoff and soil erosion, remote sensing (RS) and geographic information systems (GIS). The loss of nitrogen and phosphorus was calculated by USLE. The objective of this study was to provide a scientific basis for decreasing and controlling loss of nitrogen and phosphorus from agricultural sources. The results indicated that the most loss of nitrogen and phosphorus from the Yutun Town, Wanglu Town and Tangkou Town locating in west coast of Nansi Lake. The maximum value of loss of nitrogen and phosphorus was from Yutun Town and was 439.9 t/a and 271 t/a, respectively. The most loss of nitrogen and phosphorus from the Shiqiao Town, Mapo Town, Huancheng Town and Hanzhuang Town locating in east coast of Nansi Lake. The maximum value of loss of nitrogen and phosphorus was from Shiqiao Town and 174 t/a and 120.6 t/a, respectively. The losses of nitrogen and phosphorus by field survey and USLE were more consistent and both showed a significant linear correlation (p＜0.01). The loss of nitrogen calculated by USLE was lower than it by field survey while the loss of phosphorus by estimated by USLE was higher. The reason was that loss of nitrogen was mainly from farm soil erosion along Nanshi Lake, while the loss of phosphorus was mainly from livestock and poultry breeding and secondly from farm soil erosion.

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