| A preliminary study on the distribution characteristics of nutrients （N, P, Si, C） in the Wujiang River Basin |
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| 引用本文： | ZHU Jun.A preliminary study on the distribution characteristics of nutrients （N, P, Si, C） in the Wujiang River Basin[J].中国地球化学学报,2005,24(4):352-360. |
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| 作者姓名： | ZHU Jun |
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| 作者单位： | [1]State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China [2]Graduate School of the Chinese Academy of Sciences, Beijing 100039, China [3]China Institute of Water Resources and Hydropower Research, Beijing 100044, China |
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| 基金项目： | 中国科学院资助项目，中国科学院资助项目 |
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| 摘 要： | The distribution of nutrients (N, P, Si, C) in the Wujiang River surface water was studied during the high-flow and low-flow periods in 2002. The results showed that nitrate nitrogen (NO3-N) is the main form of dissolved inorganic nitrogen (DIN) in the Wujiang River Basin. It accounts for about 90% of DIN. The average NO3-N concentrations in the mainstream are 147.5 μM in the high-flow period and 158.0 μM in the low-flow period, respectively. The average concentrations of total phosphorus (TP) are 6.43 μM in the high-flow period and 4.18 μM in the low-flow period, respectively. Of the various forms of phosphorus, particulate phosphorus (PP) has the highest percentage ( 62.9%) of TP in the high-flow period. In the low-flow period, however, phosphate is the main form of phosphorus, which accounts for 49% of TP. With the Wujiangdu Reservoir as the boundary, the concentrations of DIN and phosphorus in the upper reaches are different from those in the lower reaches of the Wujiang River. As a whole, the concentrations of DIN and phosphorus are both higher in the low-flow period than in the high-flow period. The spatial and temporal variations of DIN and phosphorus concentrations suggested that DIN and phosphorus come from agricultural and domestic wastewaters and groundwaters and that the Wujiangdu Reservoir has an important impact on the concentrations and distribution of DIN and phosphorus in the Wujiang River. The distribution patterns of dissolved silica (DSi) and dissolved organic carbon (DOC) are similar. Both of them maintain no change in the whole course of the river and their concentrations (with the exception of the reservoir itself) are higher in the high-flow period than in the low-flow period. The average DSi and DOC concentrations in the mainstream are 85.4, 84.6 μM in the high-flow period and 60.8, 53.9 μM in the low-flow period, respectively. The concentrations of nutrients in most of the major tributaries are lower than in the mainstream. This suggested that the contributions of most tributaries are relatively small but importance should be attached to the influence of some individual tributaries such as the Qingshuijiang River and the Weng'an River on the mainstream.
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| 关 键 词： | 乌江 地表水 营养元素 水资源 水文化学 |
| 收稿时间： | 25 July 2006 |
A preliminary study on the distribution characteristics of nutrients (N, P, Si, C) in the Wujiang River Basin |
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| Jun Zhu,Yuchun Wang,Congqiang Liu,Faxiang Tao.A preliminary study on the distribution characteristics of nutrients (N, P, Si, C) in the Wujiang River Basin[J].Chinese Journal of Geochemistry,2005,24(4):352-360. |
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| Authors: | Jun Zhu Yuchun Wang Congqiang Liu Faxiang Tao |
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| Institution: | (1) State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) Graduate School of the Chinese Academy of Sciences, 100039 Beijing, China;(3) China Institute of Water Resources and Hydropower Research, 100044 Beijing, China |
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| Abstract: | The distribution of nutrients (N, P, Si, C) in the Wujiang River surface water was studied during the high-flow and low-flow
periods in 2002. The results showed that nitrate nitrogen (NO3-N) is the main form of dissolved inorganic nitrogen (DIN) in the Wujiang River Basin. It accounts for about 90% of DIN. The
average NO3-N concentrations in the mainstream are 147.5 μM in the high-flow period and 158.0 μM in the low-flow period, respectively.
The average concentrations of total phosphorus (TP) are 6.43 μM in the high-flow period and 4.18 μM in the low-flow period,
respectively. Of the various forms of phosphorus, particulate phosphorus (PP) has the highest percentage (62.9%) of TP in
the high-flow period. In the low-flow period, however, phosphate is the main form of phosphorus, which accounts for 49% of
TP. With the Wujiangdu Reservoir as the boundary, the concentrations of DIN and phosphorus in the upper reaches are different
from those in the lower reaches of the Wujiang River. As a whole, the concentrations of DIN and phosphorus are both higher
in the low-flow period than in the high-flow period. The spatial and temporal variations of DIN and phosphorus concentrations
suggested that DIN and phosphorus come from agricultural and domestic wastewaters and groundwaters and that the Wujiangdu
Reservoir has an important impact on the concentrations and distribution of DIN and phosphorus in the Wujiang River. The distribution
patterns of dissolved silica (DSi) and dissolved organic carbon (DOC) are similar. Both of them maintain no change in the
whole course of the river and their concentrations (with the exception of the reservoir itself) are higher in the high-flow
period than in the low-flow period. The average DSi and DOC concentrations in the mainstream are 85.4, 84.6 μM in the high-flow
period and 60.8, 53.9 μM in the low-flow period, respectively. The concentrations of nutrients in most of the major tributaries
are lower than in the mainstream. This suggested that the contributions of most tributaries are relatively small but importance
should be attached to the influence of some individual tributaries such as the Qingshuijiang River and the Weng’ an River
on the mainstream.
This research project was granted jointly by the Key Research Orientation Project under the Knowledge-Innovation Program sponsored
by the Chinese Academy of Sciences (KZCX 2-105) and the National Natural Science Foundation of China (Grant No. 40103008). |
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| Keywords: | Wujiang River surface water nutrient distribution |
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