农业环境科学学报2017，Vol.36Issue(4)：743-752,10.DOI:10.11654/jaes.2016-1346
亚热带丘陵小流域氮平衡及调控对策
N balance analysis and dajusting countermeasures of small watershed in subtropical hilly area
摘要
Abstract
Two small watersheds(about 50 km2)were selected as the study region in subtropical hilly area in Changsha County, Hunan Province. By establishing N budget framework model and using data of in situ observation, door to door survey, and governmental statistical yearbooks, the input and output characteristics of nitrogen(N)and the main influencing factors were quantitatively analyzed during the 3-year period from 2012 to 2014. The results showed that N input, output, and surplus intensities in the small watersheds were averagely 312.0, 165.1, and 146.9 kg·hm-2·a-1 for the agro-watershed(AW), while 160.2, 83.3, and 76.9 kg·hm-2·a-1 for the forest-agro-watershed (FAW), respectively. A similar input and output structure were found in the two small watersheds, the dominant N input were feed and fer-tilizer, which accounted for 73.4%in AW and for 63.9%in FAW, respectively. The gaseous loss, which included ammonia volatilization and denitrification, was an important pattern of N output, contributed more than 50%. However, the N output of products accounted for just 1/4-1/3 of the total. Therefore, reduction of fertilizer application and moderate livestock and poultry breeding scale are the major approaches of controlling N input in a subtropical watershed. Correspondingly, reducing the gaseous loss of N through technical measures and strengthen-ing the N recycling use in a watershed are the primary measures in increasing N use efficiency and controlling agricultural non-point source pollution.关键词
亚热带/小流域/氮收支/农业面源污染Key words
subtropics/small watershed/nitrogen budget/agricultural non-point source pollution分类
资源环境引用本文复制引用
韩增,王美慧,周脚根,王毅,沈健林,李希,李裕元,吴金水..亚热带丘陵小流域氮平衡及调控对策[J].农业环境科学学报,2017,36(4):743-752,10.基金项目
国家科技支撑计划项目(2014BAD14B02) （2014BAD14B02）
水利部公益性行业科研专项项目(201501055) （201501055）
湖南省重点研发计划项目(2015NK3055) The National Key Technology Research and Development Program of the Ministry of Science and Technology of China(2014BAD14B02) （2015NK3055）
The Special Scientific Research Fund of Meteorological Public Welfare Profession of China(201501055) （201501055）
The Key R&D Program of Hunan Province(2015NK3055) （2015NK3055）
