汇水区土地利用方式对水库水质的影响

发布时间：2018-05-25 23:19

本文选题：水库汇水区 + 水质　；参考：《西南大学学报(自然科学版)》2017年11期

【摘要】：为探索人类活动对汇水区水质的影响,以重庆市渝北区50个水库汇水区为研究地点,应用景观生态学的原理与技术,从汇水区的角度探讨了土地利用类型的景观组成与景观格局特点对水库水质的影响.结果显示:1)建设用地比例对NH_3-N质量浓度变化的影响最大,其相关系数值最高(r=0.494,p0.01);草地面积与综合评价指数、TN之间表现出了极具有统计学意义的负相关关系(p0.01).通过多重对比发现,当建设用地比例为10%时,水库中含氮污染物质量浓度上升幅度明显增加,而当林地比例20%时,水库水质的综合评价指数降低幅度明显增加.2)水库汇水区中,建设用地斑块最大斑块指数、聚集度、连通性指数与TN,NH_3-N之间表现出极有统计学意义的正相关关系(p0.01),林地斑块间的几何平均临近距离与TP、综合评价指数之间表现出了极具有统计学意义的正相关关系(p0.01).
[Abstract]:In order to explore the influence of human activities on the water quality of catchment area, 50 reservoirs in Yubei District of Chongqing were used as the research sites, and the principles and techniques of landscape ecology were applied. The effects of landscape composition and landscape pattern characteristics of land use types on reservoir water quality are discussed from the point of view of catchment area. The results showed that the proportion of construction land had the greatest influence on the change of NH_3-N mass concentration, and the correlation coefficient was the highest, and there was a very significant negative correlation between grassland area and comprehensive evaluation index (TN). Through multiple comparisons, it is found that when the proportion of construction land is 10, the concentration of nitrogen pollutants in the reservoir increases obviously, while when the proportion of forest land is 20, the comprehensive evaluation index of reservoir water quality decreases significantly. 2) in the catchment area of the reservoir, The largest patch index, aggregation degree, The connectivity index and TNN NH3-N showed a very significant positive correlation, and the geometric mean proximity distance between forest patches and TPP, and the comprehensive evaluation index showed a very significant positive correlation between them.
【作者单位】：西南大学园艺园林学院;
【基金】：重庆市科委应用开发计划项目(catc2014yykfA90001)
【分类号】：F301.24;X524

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