Estimating sediment and particulate organic nitrogen and particulate organic phosphorous yields from a volcanic watershed characterized by forest and agriculture using SWAT model

Annales de Limnologie: International journal of limnology

Atsushi Hayakawa¹  Krishna P. Woli¹  Sabine Sauvage²  Rui Jiang³  Ryusuke Hatano⁴  Xiaomin Mao⁵  Chunying Wang⁶  Kanta Kuramochi⁷  José-Miguel Sánchez-Pérez⁷ 

[1] CNRS, EcoLab, 31326 Castanet Tolosan Cedex, France;Center for Agricultural Water Research in China, China Agricultural University, 100083 Beijing, China;College of Resources and Environment, Northwest A&Department of Agronomy, Iowa State University, 1318 Ames, USA;F University, 712100 Yangling, China;Graduate School of Agriculture, Hokkaido University, 0600808 Sapporo, Japan;Laboratoire Ecologie Fonctionnelle et Environnement (EcoLab), University of Toulouse, INPT, UPS, Avenue de l'Agrobiopole, 31326 Castanet Tolosan Cedex, France

关键词: Particulate organic nitrogen (PON);    particulate organic phosphorous (POP);    sediment yield;    soil and water assessment tool (SWAT);   

DOI  :  10.1051/limn/2014031

学科分类：地球科学(综合)

来源: EDP Sciences

【 摘 要 】

The study was conducted in the Shibetsu River watershed (SRW), Hokkaido, Japan, in order to examine the possibility of using the soil and water assessment tool (SWAT) to provide an understanding of sediment and particulate organic nitrogen (PON) and particulate organic phosphorous (POP) yields between 2003 and 2008. The SRW is a non-conservative catchment (the surface catchment lying on a continuous impervious horizon) and it is recognized that it receives external groundwater (EXT) from other watersheds. The EXT yield from each hydrologic response unit (HRU) was added to streamflow in the SWAT model. Simulated daily sediment and PON and POP yields from the SWAT model showed a strong agreement with the observed values. The simulated annual sediment yield ranged from 5 to 45 tonnes.km^{−2.yr−1 (annual mean of 24 tonnes.km−2.yr−1). Annual PON yield ranged from 0.1 to 0.3 tonnes.km−2.yr−1 (annual mean of 0.18 tonnes.km−2.yr−1). Annual POP yield ranged from 0.01 to 0.03 tonnes.km−2.yr−1 (annual mean of 0.02 tonnes.km−2.yr−1). Snowfall, snowmelt and rainfall seasons contributed about 10, 20 and 70% respectively to total sediment and associated PON and POP yields. The SWAT model identified that sub-basins located in the upper part of the watershed were critical source area of land surface erosion. This research demonstrates the ability of the SWAT model to estimate sediment and associated PON and POP yields, and to improve the understanding of soil erosion mechanisms at catchment scale receiving external water.}

【 授权许可】

CC BY