摘要
以快速城市化新区园林绿地型缓冲带——太湖新城太湖湖滨带为研究对象,测定湖滨带内总氮(TN)、总磷(TP)、氨氮(NH+4-N)、化学需氧量(CODCr)等水质指标,通过比较和分析湖滨带水质空间变化及不同降水时期湖滨带的水质变化来评价其缓冲效果。结果表明,湖滨带主要污染物为CODCr和TN,尤其是CODCr。在雨季,各采样点水体的TN平均质量浓度在III^IV类水,NH+4-N平均质量浓度达到I类水,TP平均质量浓度维持在III类水,CODCr平均值在V类水到劣V类水之间。在旱季,各采样点水体的TN平均质量浓度维持在III类水,NH+4-N平均质量浓度达到I类水,TP平均质量浓度维持在II^III类水,CODCr平均值为IV^V类水,除CODCr外,试验区出水口水质指标都可达到IV类水水平。雨季的时候,大量污染物进入水体导致水体污染物输出质量浓度显著增高,最为突出的是TN、TP和NH+4-N。对于TN、TP来说,X9点和其他各点差异性显著;对于可溶性无机正磷酸盐(PO3-4-P)来说,X1、X2、X3、X4点与X6、X7、X8、X9点之间差异性极显著,X5点是分界点。旱季,X9点的NO-2-N质量浓度高于其他点,尤其是X2点与X3点之间的差异极显著。无论是雨季还是旱季,不同指标下采样点之间差异较小,整体比较稳定。
This study is inclined to disclose the buffering effect of the Riparian Zone of Taihu Lake near the New Taihu Town through analy- sis and comparison of the spatial variation of water quality in the lake- side zone and the water quality change of the Lake buffer zone, par- ticularly during the different precipitation periods in the urban area of New Taihu Town, which is now experiencing the rapid urbanization drive while trying to build a new area with green garden space serving the buffer zone. In our study, we have tested the contents and the content concentration to evaluate the water quality indexes, such as those of TN, TP and CODcr in the water. The results of our experi- mental testing show that the major pollutants of the water in the buffer zone were CODcr and TN, especially that of CODcr. It is found that in the rainy season, the average concentration of TN ranges from the water level Grade Ⅲ to Grade Ⅳ. To be accurate, we have found that in the water of grade I, there exists NH＋ - N, whereas in the water of grade Ⅲ, TP is contained, and in the water of Grade V, CODcr ranges from Grade V regular to Grade V poor. During the dry season, the average concentration of TN remains in the water of Grade Ⅲ, while NH4＋ - N is contained in the water of Grade Ⅰ. At the same time, TP ranges from the water of Grade Ⅲ whereas in the water of grade Ⅱ, CODcr ranges from regular grade Ⅴ to bad grade V. Except for CODcr, all the water samples selected from the outlets of the testing area can all prove to belong to Grade Ⅳ. Moreover, we have also found that due to the excessive pollutants discharged into the water during the rainy season, the pollutant contents in the water samples chosen were found increasing significantly in the test area, with the most prominent pollutant being TN, TP, and NH4＋ - N. Furthermore, it is also found that in the said season, significant dif- ference is shown in the contents of TN and TP. As for PO34- - P, by taking X5 as the demarcation point, there exists also significant dif- ference among the points of X1, X2, X3, X4 and those of X6, X7, X8, X9. However, in dry season, the concentration of NO2- - N in X9 was found higher than in the other points, especially those of X2 and X3. Nevertheless, no matter whether in rainy season or in dry season, the difference of such points proves rather small under differ- ent standards, and the general states of these grades of water prove to be comparatively stable.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2013年第5期129-134,共6页
Journal of Safety and Environment
基金
国家"十一五"水专项(2009ZX07101-009-001)
中央高校基本科研业务费专项资金项目(JUSRP111A11)
关键词
环境工程学
湖滨带
缓冲效果
面源污染
environmental engineering
riparian area
buffering ef- fect
non-point source pollution
