| 中田河流域景观异质性对水体总氮浓度影响研究 |
| 摘要点击 1967 全文点击 888 投稿时间：2015-07-12 修订日期：2015-09-21 |
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| 中文关键词 总氮 景观异质性 土地利用结构 多元回归 主成分分析 中田河流域 |
| 英文关键词 total nitrogen landscape heterogeneity land-use structure multivariate regression principal component analysis Zhongtian River watershed |
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| 中文摘要 |
| 土地利用变化使输移至河流的营养盐负荷发生变化从而导致地表水水质变化. 研究景观异质性对营养负荷的影响程度对改善水质的最佳管理措施至关重要. 本研究从 2013年 1~12月,对中田河流域干支流水系 20个监测点的地表水总氮浓度进行了周年定点监测,考虑到流域单元的嵌套关系,选择 7个土地利用结构和 13个景观格局指数,探讨了景观异质性对中田河流域水体总氮浓度的影响. 研究表明:①建设用地和草地对总氮浓度有重大影响,表现为建设用地会恶化水质,而草地可以改善水质; ②景观斑块-形状指数、 景观斑块-面积指数和建设用地是景观尺度上影响流域总氮浓度的主要因素; ③回归分析进一步显示建设用地和景观斑块-面积指数对总氮浓度的贡献分别是 67.31%和 32.69%. |
| 英文摘要 |
| Nutrient loading into rivers is generally changed by human-induced land use changes and can lead to surface water quality changes. Understanding the extent to which landscape heterogeneity influences nutrient loading is critical to the development of best-management practices aimed at water-quality improvement. In this study, the year-round concentrations of total nitrogen were monitored from January 2013 to December 2013 in the 20 hydrological stations of Zhongtian River. Considering the nested relationship of watershed unit, seven land use structures and 13 landscape pattern indexes were chosen, and Pearson correlation analysis, principal component analysis and multiple regression analysis were used to explore the effects of land use pattern on total nitrogen concentrations in Zhongtian River. The results showed that: ① Construction land and grasslands had a significant impact on total nitrogen concentration, construction land would worsen the water quality, while grasslands could improve water quality; ② Landscape patch-shape index, landscape patch- area index and construction land were the main factors affecting the total nitrogen concentration in landscape scale; ③ Regression analysis showed that the construction land and landscape patch-area index contributions to total nitrogen concentrations were 67.31% and 32.69%, respectively. |
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