| In order to reasonable utilization of wetland resources and protect wetland and biologicaldiversity and realize the sustainable development of the region, Yintan wetland in Lanzhousection of Yellow River was chosen as the study object. Water, which was sensitive factor inwetland ecosystem, was evaluated and quantitative analyzed. The results were showed as follow:1. According to the wetland survey showed that: the problem of Yintan wetland in Lanzhousection of Yellow River included: sharp dropping of wetland area, pollution of the wetland waterand insufficient of the river base flow. The normal operation of the Yintan wetland ecosystem inLanzhou section ofYellow River was seriously affected by the existence of these problems.2. Ecosystem health status of Yintan wetland in Lanzhou section of Yellow River wasevaluated. The results showed that Yintan wetland ecosystem was coming up to the sub-healthstatus and had a tendency to the general morbid.3. Yintan wetland ecosystem had purification or degradation function to pollutants inwater. The study also found that the purifying effect of the different sections was different to thesame indicators; Variation of the same indicator under the different water conditions was not thesame.4. In addition to pH and TP, the other indicators were showed that: The mostsignificant change was the normal river flow period, followed by wet season, dry season was thelast; to the Total Phosphorus, it was showed that: The most significant change was dry season,followed by the normal river flow period, wet season was the last; to the pH, it was showed that:The most significant change was the normal river flow period, followed by dry season, wetseason was the last.5. Purifying effect of the different sections to the same indicators were not the same.Indicator concentration was not laid with the samples order, change trend was fluctuated in theSample2and sample6. It’s maybe because that Sample2was laid nearby a sewage outfall andSample6was laid nearby wide water area. But the overall trend showed adownward tendency, intake> outlet.6. The study was based on the fuzzy matter element theory, water quality monitoring resultsof Yintan wetland in Lanzhou section of Yellow River were chosen as the things of matterelement. The composite fuzzy matter element was constructed with each monitoring sections asfuzzy values. Variation coefficient method was taken to calculate the weight. Euclid approachdegree was used to analysis purification effect, of which the study area ecology system to fiveindicators, which were NH3-N, TP, BOD5, COD, and pH. The results showed that:the sequencing of purification ability of study area to each indicator was: pH> NH3-N=COD>TP> BOD5. 7. The ecological water demand was6.08×105m3, different ecological targets with differentecological water demand.5.12×105m3, which was lower ecological water demand, can besatisfied with maintaining the area of the reed marshes and protecting the loss of ecologicalcharacteristics.6.08×105m3, which was higher ecological water demand, can be satisfy withmaintaining the quality and area of the wetland and ensuring the value the plant andanimal habitats and protecting the loss of ecological characteristics.8. The ecological water demand calculated by water balance had a good correspond withplant habitat water demand. the result showed the reduction factor of Penman can be used inYintan wetland in Lanzhou section ofYellow River9. Dynamic water supplement distribution could be classified into four grades: The firstgrade was July, August and September, second grade was April, May and June, third grade wasMarch and October, and forth grade was January, February, November and December.It was expected that the results of this study could suggest on effective management of otherwetland in Lanzhou section ofYellow River. |
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