农业环境科学学报Issue(8)：1609-1616,8.DOI:10.11654/jaes.2014.08.020
天津于桥水库流域水体氮磷空间分异与景观格局的关系
Relationship Between Spatial Variation of Nitrogen and Phosphorus in Water and Landscape Pattern in Yuqiao Reservoir Basin, Tianjin
摘要
Abstract
Water quality is often influenced by landscape patterns in a basin. Here we collected water samples from 24 locations in Yuqiao Reservoir Basin, Tianjin, and analyzed the spatial heterogeneity of nitrogen and phosphorus in water using cluster analysis and explored its relationship with landscape spatial patterns. Spatially, these sampling points were divided into 3 groups:Group A, highly polluted sites where water quality was mostly influenced by partially industrial effluents and domestic wastewater; Group B, moderately polluted sites where water quality was mainly affected by soil erosion from orchards due to the slope;and Group C, relatively less polluted sites where the terrain is low and there was little human impact. The percentage of cropland area was positively correlated with TN, PO 3-4-P and DTP, while that of construction area was positively correlated with DTP, TN, NH-N and PO3-4-P. The proportion of garden area was positively correlated with TN and NH+4-N. However, the ratio of woodland area was negatively correlated with NH+4-N(r=-0.459). At class-level, landscape indices-number of patches(NP), patch density(PD)and landscape shape index(LSI)were all positively correlated with water phosphorus. Landscape indices were good indicators of water and soil erosion. Our results show that greater fragmentation, larger diversity and more scat-tered distribution of landscape would cause more nutrient losses.关键词
景观格局/于桥水库/氮/磷/相关分析Key words
landscape pattern/Yuqiao Reservoir Basin/nitrogen/phosphorus/correlation analysis分类
资源环境引用本文复制引用
包姗姗,李崇巍,王祖伟,陈萍,郭继发..天津于桥水库流域水体氮磷空间分异与景观格局的关系[J].农业环境科学学报,2014,(8):1609-1616,8.基金项目
国家自然科学基金 （）
