Nutrient budgets and biogeochemistry in an experimental agricultural watershed in Southeastern China
文献类型：期刊论文
| 作者 | Yan, WJ; Yin, CQ; Zhang, S |
| 刊名 | BIOGEOCHEMISTRY
 |
| 出版日期 | 1999 |
| 卷号 | 45期号:1页码:1-19 |
| 关键词 | Chaohu Lake chemical fertilizer cycling denitrification multipond system nitrogen nutrient budget phosphorus |
| 英文摘要 | During a two-year held study, an annual nutrient budget and cycles were developed for a small agricultural watershed. The study emphasized the integrated unit of the watershed in understanding the biogeochemistry. It was found that the total nutrient input was 39.1 x 10(4) kg nitrogen and 3.91 x 10(4) kg phosphorus in the year 1995, of which the greatest input of nutrients to the watershed was chemical fertilizer application, reaching 34.7 x 10(4) kg (676 kg/ha) nitrogen and 3.88 x 10(4) kg (76 kg/ha) phosphorus. The total nutrient output from the watershed was 13.55 x 10(4) kg nitrogen and 0.40 x 10(4) kg phosphorus, while the largest output of nitrogen was denitrification, accounting for 44.1% of N output; the largest output of phosphorus was sale of crops, accounting for 99.4% of P output. The results show that the nutrient input is larger than output, demonstrating that there is nutrient surplus within the watershed, a surplus which may become a potential source of nonpoint pollution to area waters. The research showed that both denitrification and volatilization of nitrogen are key ways of nitrogen loss from the watershed. This suggests that careful management of fertilizer application will be important for the sustainable development of agriculture. The research demonstrated that a multipond system within the watershed had high retention rate for both water and nutrients, benefiting the water, nutrient and sediment recycling in the terrestrial ecosystem and helping to reduce a,agricultural nonpoint pollution at its source. Therefore, this unique watershed system should be recommended due to its great potential relevance for sustainable agricultural development. |
| 研究领域[WOS] | Environmental Sciences & Ecology ; Geology |
| WOS记录号 | WOS:000078939900001 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/24225]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Yan, WJ,Yin, CQ,Zhang, S. Nutrient budgets and biogeochemistry in an experimental agricultural watershed in Southeastern China[J]. BIOGEOCHEMISTRY,1999,45(1):1-19. |
| APA | Yan, WJ,Yin, CQ,&Zhang, S.(1999).Nutrient budgets and biogeochemistry in an experimental agricultural watershed in Southeastern China.BIOGEOCHEMISTRY,45(1),1-19. |
| MLA | Yan, WJ,et al."Nutrient budgets and biogeochemistry in an experimental agricultural watershed in Southeastern China".BIOGEOCHEMISTRY 45.1(1999):1-19. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。