Numerical simulations of nutrient transport changes in Honghu Lake Basin,Jianghan Plain |
| |
Authors: | Feng Gui Ge Yu |
| |
Institution: | (1) Zhejiang Ocean University, Zhoushan, 316000, China;(2) Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China |
| |
Abstract: | Nutrients transported from catchments are one of the most important sources for lake eutrophication. In this study, the Honghu
Lake Basin, located at the middle reaches of the Yangtze River, was chosen as the study area, and the watershed hydrological
distribution model SWAT (Soil Water Assessment Tool) was applied to evaluate the trajectory of watershed nutrient transportation
over time. Based on the analysis of driving factors, three experiments corresponding to natural, traditional and modern agriculture
processes respectively were designed to evaluate the changes of nutrient inputs from catchments under the three environments.
The simulation results showed that there were variations in nutrient production and changes in the range and rate. For three
periods of the experiments, TN concentrations have changed as 0.12→0.31→1.15 mg/L, and production as 420→1650→6522 T/a; while
TP concentrations changed as 0.018→0.057→0.117 mg/L, and production as 78→303→665 T/a. The nutrient transportation experienced
slowly long-term increases during 1840–1950, then showed a relatively rapid increase during the period of 1950–1980s and the
period from 1980 to early 1990s, with increasing rate of 1.4% and 2.4% respectively. And from the later 1990s to now, an obviously
increasing trend with 15% increasing rate occurred. The effect from human activities on the watershed nutrient transportation
increased rapidly, and had become a dominant factor in changes of the nutrient transportation.
Supported by the Major Special Program of National Science and Technology of China (Grant No. 2008ZX02002-001) |
| |
Keywords: | changing environment nutrients transportation evolution numerical simulation Honghu Lake Basin |
本文献已被 维普 SpringerLink 等数据库收录! |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |
|