[Analysis of phosphorus distribution characters and their sources of the major input rivers of Three Gorges Reservoir].
[Analysis of phosphorus distribution characters and their sources of the major input rivers of Three Gorges Reservoir].
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发表时间：
2008
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通讯作者：
Cheng-jin Cao;Yan-wen Qin;B. Zheng;Min-sheng Huang
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作者：
Cheng-jin Cao;Yan-wen Qin;B. Zheng;Min-sheng Huang
根据2004年1月至2005年12月的调查，探讨了三峡水库入水河流水通量和悬浮物、磷的季节特征，并研究了其在长江、嘉陵江、乌江三大入江河流中的分布规律。结果表明，这些参数的季节变化较为明显。丰水期通量和悬浮物均高于枯水期，说明悬浮物来源于底质，三条入河流域水土流失严重。三峡进水河流的3条监测断面总磷年均含量约为0.12～0.29毫克/升，超过了3条进水河流1970年代的水平。总磷酸盐中大部分是总固体磷酸盐（TPP），其中超过75%。 TP和TPP与三峡进水河流的通量和悬浮物均具有明显的正相关性，且TPP和TP也具有相同的相关性，这意味着三峡进水河流的磷酸盐污染来自于底质污染。面源污染对磷酸盐污染影响深远。氮和磷酸盐不是三峡进水河流营养盐的主要限制因素。氮磷比(N/P)处于较高水平(30以上)，即磷酸盐首先达到较低水平，并可能成为三峡进水河流营养盐的限制因素。
The seasonal characters of the water flux and suspended substance, phosphorus in the water of input rivers of Three Gorges Reservoir (TGR) were discussed, and the their distributions among three major input rivers (Changjiang river, Jialingjiang river and Wujiang river) were studied, according to the survey conducted from Jan. 2004 to Dec. 2005. The results indicate that those parameters' seasonal changes are obvious. The flux and suspended substance in abundant water period are more higher than them in low water period, which displays suspended substance origins from bedload and that the water and soil severely lose in drainage areas of three input rivers. In the three monitor sections of input rivers of TGR, the average contents per year of total phosphorus are about 0.12-0.29 mg/L, which exceeds the 1970s level of the three input rivers. Most of total phosphate is total solid phosphate (TPP) exceeding 75% of them. TP and TPP have both distinct positive correlation with the flux and suspended substance in water of input rivers of TGR, and TPP and TP have also the same correlation, which means that phosphate pollution in the input rivers of TGR comes from bedload. The nonpoint source pollution has had far-reaching influence upon phosphate pollution. Nitrogen and phosphate are not the major limiting factor of the nutritious salts in the input rivers of TGR. The rate of between nitrogen and phosphate (N/P) is in higher level (above 30), that is phosphate first will reach lower level and maybe become the limiting factor of the nutritious salts in the input rivers of TGR.