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%.
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 bestmanagement 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 patchshape index,landscape patch- area index and construction land were the main factors affecting the total nitrogen concentration in landscape scale; 3Regression analysis showed that the construction land and landscape patch-area index contributions to total nitrogen concentrations were 67. 31% and 32. 69%,respectively.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2016年第2期527-533,共7页
Environmental Science
基金
国家自然科学基金项目(41171071
41571171)
中央高校基本科研业务费专项(KYZ201522)
江苏高校优势学科建设工程项目
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
total nitrogen
landscape heterogeneity
land-use structure
multivariate regression
principal component analysis
Zhongtian River watershed
