SPATIAL DISTRIBUTION OF NUTRIENTS OF SHALLOW LAKE IN THE ZHALONG WETLAND
- 出版年：2006
- 作者：WANG Lei ZHANG Guang-Xin
- 单位1：Northeast Institute of Geography and Agroecology
- 出生年：1982
- 语种：中文
- 作者关键词：the Zhalong wetland；nitrogen；phosphorus；hydrodynamic effect；plant absorption
- 起始页：193
- 总页数：5
- 经费资助：President Scholarship of Chinese Academy of Sciences.
- 刊名：湿地科学
- 是否内版：否
- 刊频：季刊
- 创刊时间：2003
- 主办单位：中国科学院东北地理与农业生态研究所
- 主编：陈宜瑜
- 地址：北京东黄城根北街16号
- 邮编：100717
- 电子信箱：wetlands@neigae.ac.cn
- 卷：4
- 期：3
- 期刊索取号：P224.06 141
摘要
The Zhalong wetland, a Ramsar listed wetland in China, which is located in the lower reaches of the Wuyu'er River, perennially takes in lots of nutrient input of N and P from around the catchment. Nutrient substances were especially accumulated in the shallow lakes owning to the low - lying topography. The Xianhe Lake, where is loca-ted in buffer zone of the Zhalong wetland reserve, was chosen as our target area. The spatial variation of nutrient sub-stances in the shallow lakes was discussed and its influence factors were pointed out. The results showed that nitrogen and phosphorus in the wetland water existed mainly in the form of organic ones. The concentration of tofal nitrogen ( TN)ranged from 0.65 mg/L to 10.64 mg/L and total phosphorus ( TP) ranged from 0.013 mg/L t0 0.052 mg/L. Ratio of N/P was between 25.6 and 206.5. The water quality of the Xianhe Lake has been contaminated and is in heavy eutroph-ication. Total P has been acting as the major limiting factor. The distribution pattern of nitrogen and phosphorus in wet-land water showed characteristics of internal release except for the stream mouth area. There, the vertical distributions of nitrogen and phosphorus nutrients were from both exterior source and internal release, and was mainly influenced by ex-terior source during flood period. Strong hydrodynamic disturb contributed to nitrogen and phosphorus nutrients suspen-ding and releasing in the sediments. The nutrients distribution in the water varied independent on regional changes of different frequency of hydrodynamic disturb. Mineralization and denitrification might be promoted in high frequency hy-drodynamic disturb area. In growing period, the absorption of Phragmites to nutrients was an important mechanism of nu-trients descending and spatial variation in the shallow lake.