东辽河流域地表水体中Atrazine的环境特征

Environmental Characteristics of the Atrazine in the Waters in East Liaohe River Basin

在野外踏勘调查与室内分析的基础上,以GIS技术为关键数据处理平台,系统剖析了东辽河流域地表水体中莠去津(Atrazine)的含量和富集特征的时空分异;并对其影响因素进行了分析.结果表明,东辽河流域旱田分布区和非旱田分布区内地表水中Atrazine的平均含量分别为9 .71 μg·L-1 和8 . 85. 4 μg·L-1 ,在干流下游形成了分布的高值区;7月份是流域地表水中Atrazine含量最高的时期,最大值可达1 8 . 93μg·L-1 .水体中Atrazine的空间分布进一步表明,在东辽河流域旱田施放的Atrazine已经危及到整个流域的地表水水质,将对流域的生态环境产生严重的影响.相对于植物来说,东辽河流域Atrazine在地表水中富集的归一化指数为0 . 6 0 5～1 .75 0 ;从空间分异上看,干流右侧流域形成了连片的高值区,而左侧形成了连片分布的低值区,且在下游形成富集程度的集中高值区.地表水中Atrazine相对于土壤的富集特征的空间分异与相对与植物的富集特征相类似,但其高值区和低值区都是散斑状分布.从土壤类型对水体中Atrazine含量的影响看,低位泥炭土的综合表征指数较高,泥炭沼泽土和水稻土的综合表征指数较小;从景观格局对地表水中Atrazine含量的影响看,随着斑块间相互作用能力的增强,水中Atrazine的综合表征指数逐渐升高.在一定的范?

Based on the filed investigation and the Laboratory experiment, and taking the Geographic Information System (GIS) techniques as the key data disposal platform, the spatial and temporal differences and the enrichment characteristics of atrazine in the surface water in East Liaohe River Basin were systematically analyzed, the effect factors on that also were interpreted. The results show that, the average atrazine content in waters in regions with glebe or without glebe were namely 9.71μg·L -1 and 8.854μg·L -1, and the lower reach of the trunk was formed as the focus filed of the atrazine in waters. July is the month that the water contained the largest atrazine with the maximum content of 18.93μg·L -1. The spatial pattern of the atrazine in the waters clearly shows that, the atrazine used in the glebe are endangering the surface waters quality in the whole basin and will worsen the waters environment of East Liaohe River basin. The normalized enrichment index of the atrazine in the surface water related to plant atrazine is 0.605～1.750 with the spatial difference, the right part of the trunk is the continuous region with high index, the left part of the trunk is on the contrary, and the lower reaches is the focus region with high index. The normalized enrichment index of the atrazine in the surface waters related to soil atrazine has the spatial difference same to the index related to soil, however, the region with large index or little index has the scattering features. With respect to the effect of soil on the atrazine in the water, the integrated token index of the low moor peat soil is the largest and the peat moor soil and the paddy soil are the lest. With respect to effect of the landscape pattern on the atrazine in the surface waters, the integrated token index will increase with the interaction between patches. With a certain range, the integrated token index will increase with the precipitation and runoff; however, the integrated token index will decrease with precipitation if the precipitation excesses the range.