| 杨旭,李畅游,李文宝,史小红,赵胜男,王旭阳.封闭型内陆湖泊夏季氮素赋存特征——以达里诺尔湖为例[J].农业环境科学学报,2018,37(10):2262-2269. |
| 封闭型内陆湖泊夏季氮素赋存特征——以达里诺尔湖为例 |
| Characteristics of nitrogen accumulation in closed inland lakes in summer: A case study of Dali-Nor Lake, China |
| 投稿时间：2018-01-02 |
| DOI：10.11654/jaes.2018-0004 |
| 中文关键词: 水资源保护 封闭性内陆湖 氮素 入湖河流 |
| 英文关键词: water resources protection closed inland lake nitrogen rivers into the lake |
| 基金项目:国家自然科学基金项目（51339002，51669022，51469025，51669002，51509133，51709162，513390020）；内蒙古自治区自然科学基金项目（2016MS0552）；中国博士后科学基金项目（204M562495XB）；自治区级创新团队项目 |
|
| 摘要点击次数: 2134 |
| 全文下载次数: 2187 |
| 中文摘要: |
| 氮素是影响湖泊初级生产力的主要因素之一。近年来，受气候干旱及上游用水量增加等因素的影响，大多数封闭性内陆湖都面临着湖面萎缩、湖水因营养盐浓度增加而逐渐恶化的问题。本文以内蒙古高原境内封闭型内陆湖泊——达里诺尔湖为例，于2017年夏季采集湖水、间隙水、沉积物、入湖河流等样品。对湖泊氮素赋存特征、迁移趋势做出分析，并且对入湖河流携带的氮素对湖泊水质的影响展开讨论。结果表明：氨氮（NH4+-N）是上覆水中占比例最高的形态氮。总氮（TN）、硝酸盐氮（NO3--N）、亚硝酸盐氮（NO2--N）含量随水深从浅到深基本保持不变。只有B6、E2、E5样点的NH4+-N在水深1.5 m向下处含量有所波动。表层沉积物TN均值2 809.97 mg·kg-1，可交换态氮占TN含量6.74%；河水中占比例最高的形态氮是NO3--N，四条入湖河流中，TN、NH4+-N含量最高的是沙里河，NO3--N含量最高的是亮子河；每年由入湖河流携带入湖的TN量为120 t。总体来看，达里诺尔湖氮素赋存特征为：NH4+-N是上覆水的主导形态氮，TN及各形态氮含量在不同深度水层掺混均匀，无明显的分层现象。沉积物TN含量较高且氮素迁移能力较强。TN、NO3--N、NO2--N表现为由沉积物到上覆水的释放状态，而NH4+-N则以上覆水到沉积物的吸附状态为主。河流的输入对湖水TN含量有稀释作用，但会增加湖水NO3--N的负荷。 |
| 英文摘要: |
| Nitrogen is one of the main factors affecting the primary productivity of lakes. The Dali-Nor Lake, which is located in the middle part of the Inner Mongolian plateau, is the study lake of this research. The nitrogen occurrence characteristics and transferring trends were analyzed for samples of lake water, pore water, and sediment and water samples from the lake inlets, collected in the summer of 2017. The impacts of the different nitrogen forms on the water quality of the lake also were studied. The results showed that ammonium nitrogen (NH4+-N) was the largest component of total nitrogen (TN) in the upper layer of the lake water. TN, nitrate nitrogen (NO3--N), and nitrite nitrogen (NO2--N) were mixed uniformly in the lake without distinct stratification, and the TN content remained the same from the top to the bottom of the lake. The TN content in the sediments was higher, and the migration of nitrogen was stronger. TN, NO3--N, and NO2--N were in the releasing state from the sediment to the upper water layer, whereas NH4+-N was mainly in the adsorption state from the upper water layer to the sediment. The input of the river had a dilution effect on the TN content of the lake water and increased the NO3--N load of the lake water. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
