| 基于SWAT与DNDC模型对比研究亚热带流域氮淋溶与输出过程 |
| 摘要点击 2195 全文点击 869 投稿时间：2016-11-19 修订日期：2017-01-15 |
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| 中文关键词 流域 氮输出 模拟 DNDC SWAT |
| 英文关键词 watershed N export simulation DNDC SWAT |
| 作者 | 单位 | E-mail | | 韩宁 | 中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101
中国科学院大学资源与环境学院, 北京 100049 | 1293384193@qq.com | | 陈维梁 | 中国科学院生态环境研究中心, 北京 100085 | | | 高扬 | 中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101
中国科学院大学资源与环境学院, 北京 100049 | gaoyang@igsnrr.ac.cn | | 郝卓 | 中国科学院地理科学与资源研究所, 生态系统网络观测与模拟重点实验室, 北京 100101
中国科学院大学资源与环境学院, 北京 100049 | | | 于贵瑞 | 中国科学院大学资源与环境学院, 北京 100049 | |
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| 中文摘要 |
| 本研究通过对亚热带香溪河小流域的氮输出进行长期监测，并通过DNDC与SWAT模型对流域氮素流失进行对比模拟研究，以期为合理建立适合亚热带流域氮循环模型提供科学依据.结果表明：①影响DNDC模型模拟小流域内氮素流失的关键参数包括降水、坡度以及氮肥施用量，而影响SWAT模型模拟的关键参数包括地下水滞后系数、最大冠层截留量、基流系数和土壤蒸发补偿系数；②DNDC模型模拟小流域内2014年的径流量、TN和NO3--N排放量与实测值的偏差分别为5.19%、8.10%和71.70%，SWAT模型模拟小流域内2014年的TN、NO3--N和NH4+-N的排放量与实测值的偏差分别为2.04%、14.29%和8.89%；③通过对SWAT与DNDC模拟结果对比分析香溪小流域氮素流失时空分布特征，进一步耦合了DNDC和SWAT模型，有助于提高亚热带流域氮素流失模拟精确度. |
| 英文摘要 |
| In this study, N export from Xiangxi River Basin in subtropical watershed was measured by long-term monitoring, N loss in the basin was simulated by DNDC and SWAT models in order to provide a scientific basis for the establishment of nitrogen circulation model in subtropical watershed. The results showed that N loss with runoff was well simulated by DNDC and SWAT. The key parameters of DNDC were precipitation, slope and amount of N fertilization, while the key parameters of SWAT were GW_DELAY, CANMX, ALPHA_BF and ESCO. The deviations between simulations and observations of runoff, TN and NO3--N simulated by DNDC were 5.19%, 8.10% and 71.70%, respectively. Whereas the deviations between the emission of TN, NO3--N and NH4+-N simulated by SWAT and observations were 2.04%, 14.29% and 8.89%. The results indicated that the precision of N export simulated by SWAT was higher than DNDC in Xiangxi River Basin, and N loss in this area was mainly controlled by precipitation and nitrogen cycle of terrestrial ecosystem. The temporal and spatial distribution of N loss in Xiangxi River Basin was analyzed by comparing simulation results, which further demonstrated that DNDC and SWAT had simulation ability for N loss in subtropical watershed. |
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