农业源头流域景观异质性与溪流水质耦合关系
发布时间：2018-10-20 18:18
【摘要】：以丹江口库区胡家山流域为研究区域,分析了溪流枯、丰水期的水质变化特征,结合流域和河岸缓冲带景观类型及其格局,运用Spearman秩相关分析筛选了影响溪流水质的景观指数,利用逐步回归和冗余排序法定量描述景观格局与溪流水质的耦合关系.结果表明:溪流水质指标中氨氮和总磷浓度时空变化较大,其标准变异系数范围分别为69.8%~207.6%和52.0%~146.1%.景观类型中耕地和居民地是溪流水体污染的重要来源,两者在100m河岸缓冲带尺度上对氨氮的解释程度为58.6%,高于流域尺度;景观格局指数中蔓延度、林地和居民地斑块密度、林地和居民地最大斑块指数以及林地和耕地聚集度指数等显著影响溪流水质(P0.05),流域尺度上各景观类型的景观指数对总氮和总磷的解释程度分别介于71.1%~81.6%和74.5%~83.8%,均高于100m河岸缓冲带尺度,其中蔓延度对总氮和总磷均有显著影响(P0.05).无显著因子进入高锰酸盐指数模型中,其浓度变化是各景观指数共同作用的结果.此外,景观格局季节变化也显著影响溪流水质.枯水期景观指数能够更好的解释总氮和总磷变化,而丰水期对氨氮的解释程度要好于枯水期.
[Abstract]:Taking the Hujiashan watershed of Danjiangkou reservoir area as the study area, the characteristics of water quality change in the dry and high water periods of the stream were analyzed. The landscape index of the stream water quality was selected by using Spearman rank correlation analysis, combined with the landscape types and patterns of the river basin and riparian buffer zone. The coupling relationship between landscape pattern and stream water quality was described by stepwise regression and redundant sequencing method. The results showed that the concentration of ammonia nitrogen and total phosphorus in the water quality index of streams varied greatly in time and space, the standard coefficient of variation was 69.8% and 52.0% and 146.1%, respectively. Cultivated land and inhabitant land are the important sources of stream water pollution in landscape type. The interpretation of ammonia nitrogen in 100m riparian buffer zone is 58.6, which is higher than that in watershed scale, and the degree of spread in landscape pattern index, the density of forest land and the patch of resident land. The maximum patch index of woodland and residential land and the index of forest land and cultivated land aggregation significantly affected the water quality of streams (P0.05). The interpretation of total nitrogen and total phosphorus by landscape index of each landscape type on watershed scale ranged from 71.1% to 81.6% and 74.5% to 83.8%, respectively, which was higher than that of the others. 100m riparian buffer zone scale, There was significant effect on total nitrogen and total phosphorus (P0.05). There was no significant factor in the permanganate index model, and the change of the concentration was the result of the interaction of the landscape indices. In addition, the seasonal variation of landscape pattern also significantly affected the water quality of streams. Landscape index can better explain the change of total nitrogen and total phosphorus in dry season, but the interpretation of ammonia nitrogen in high water season is better than that in dry season.
【作者单位】： 华中农业大学资源与环境学院;长江水资源保护科学研究所;
【分类号】：X53
本文编号：2283997
[Abstract]:Taking the Hujiashan watershed of Danjiangkou reservoir area as the study area, the characteristics of water quality change in the dry and high water periods of the stream were analyzed. The landscape index of the stream water quality was selected by using Spearman rank correlation analysis, combined with the landscape types and patterns of the river basin and riparian buffer zone. The coupling relationship between landscape pattern and stream water quality was described by stepwise regression and redundant sequencing method. The results showed that the concentration of ammonia nitrogen and total phosphorus in the water quality index of streams varied greatly in time and space, the standard coefficient of variation was 69.8% and 52.0% and 146.1%, respectively. Cultivated land and inhabitant land are the important sources of stream water pollution in landscape type. The interpretation of ammonia nitrogen in 100m riparian buffer zone is 58.6, which is higher than that in watershed scale, and the degree of spread in landscape pattern index, the density of forest land and the patch of resident land. The maximum patch index of woodland and residential land and the index of forest land and cultivated land aggregation significantly affected the water quality of streams (P0.05). The interpretation of total nitrogen and total phosphorus by landscape index of each landscape type on watershed scale ranged from 71.1% to 81.6% and 74.5% to 83.8%, respectively, which was higher than that of the others. 100m riparian buffer zone scale, There was significant effect on total nitrogen and total phosphorus (P0.05). There was no significant factor in the permanganate index model, and the change of the concentration was the result of the interaction of the landscape indices. In addition, the seasonal variation of landscape pattern also significantly affected the water quality of streams. Landscape index can better explain the change of total nitrogen and total phosphorus in dry season, but the interpretation of ammonia nitrogen in high water season is better than that in dry season.
【作者单位】： 华中农业大学资源与环境学院;长江水资源保护科学研究所;
【分类号】：X53
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