摘要
运用连续-分布式参数模型(AnnualizedAgriculturalNonPointSourceModel,AnnAGNPS)进行中国南方山区中等尺度流域———九龙江流域农业非点源污染负荷估算和对流域过程和管理措施的模拟.利用4个典型汇水区校正模型参数,并进一步在九龙江的北溪和西溪两大支流流域验证模型的适宜性.以此为基础模拟西溪总氮负荷为24·76kg/(hm2·a),总磷负荷为0·67kg/(hm2·a);北溪总氮负荷10·28kg/(hm2·a),总磷负荷为0·40kg/(hm2·a).运用AnnAGNPS模型对典型汇水区特定集水单元、西溪和北溪流域的土地利用管理措施进行分别模拟.模拟结果显示坡地种植退耕返林后,天宝仙都集水单元92地表径流、泥沙、总氮和总磷负荷可分别削减了21·6%、25·9%、96%和79·2%;下庄集水单元93地表径流、泥沙总氮和总磷负荷削减率分别为94·1%、54·9%、99·2%,和79·7%;模拟西溪香蕉地改种双季稻,西溪总氮、可溶态氮、总磷和可溶性磷依次削减了23·83%、25·44%、9·08%和19·84%;模拟北溪流域内生猪场全部搬迁,流域出口总氮和可溶态氮的削减率分别为63·54%和76·92%.
The modelling package Annualized Agricultural Nonpoint Source Model (AnnAGNPS) was used to predict pollutant loads, and simulate catchment processes and management practices in Jiulong River watershed, a medium-sized mountainous watershed in southeast of China. Four typical sub-watersheds were primarily chosen to calibrate AnnAGNPS model by data collected from storm events during the period of April to September, 2003. The model was further validated in the two biggest branches of Jiulong River watershed, i.e. West river and North river by the data regarding climate, and land using condition in 2002～2003. The simulation results show that annual total nitrogen load was 24.76kg/(hm^2·a) and 10.28kg/(hm^2·a) in the West river and North river, respectively, and annual total phosphorus load was 0.67kg/(hm^2·a) and 0.40kg/(hm^2·a) in the West river and North river, respectively. With the support of AnnAGNPS model, several management alternatives were separately simulated in the typical sub-watersheds, West river and North river. In the specific cell with cell-ID of 92 in Tianbao and Xiandu sub-watershed, after reforesting in sloping field, runoff surface, sediment yield, total nitrogen load and total phosphorus load cut down with 21.6%, 25.9%, 96% and 79.2%, respectively. In West river, with the cultivation plant changing from banana into rice, the total nitrogen, dissolved nitrogen, total phosphorus and dissolved phosphorus cut down with 23.83%, 25.44%, 9.08% and 19.84%, respectively. In North river, when removing all the hoggerys, nitrogen and dissolved nitrogen cut down with 63.54% and 76.92%, respectively.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2005年第4期63-69,共7页
Environmental Science
基金
福建省科技重大攻关项目(2002H009).
