| 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,2014,33(8):1609-1616. |
| 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 |
| |
| DOI：10.11654/jaes.2014.08.020 |
| 中文关键词: 景观格局 于桥水库 氮 磷 相关分析 |
| 英文关键词: landscape pattern Yuqiao Reservoir Basin nitrogen phosphorus correlation analysis |
| 基金项目: |
|
| 摘要点击次数: 3251 |
| 全文下载次数: 2452 |
| 中文摘要: |
| 以于桥水库流域内24个采样点的水质营养盐监测数据为基础，分析了流域水质氮磷的空间异质性。运用聚类分析将24个子流域分成3组，即受工业污染源和居民生活污水污染严重的高度污染组（A组），坡度较大且受果园土壤侵蚀带来的氮磷污染物影响严重的中度污染组（B组），地势低平且无明显聚集性人为干扰的低污染组（C组），而且发现在城镇化格局影响下总氮污染空间差异相对其他指标较小。结合2013年ETM遥感影像解译的土地利用现状图，探讨了流域景观格局与河流水体中营养盐浓度的相关关系。结果表明，流域内“源汇”特性明显：耕地面积比与总氮（TN）和磷酸盐（PO3-4－P）存在显著的正相关性，与溶解性总磷（DTP）存在极显著的正相关性；城市建设用地面积比与DTP、TN和氨氮（NH+4－N）有显著的正相关性，与PO3-4－P表现为极显著的相关性；园地的面积比对TN和NH+4－N具有显著的正相关性；林地是本流域主要的 “汇”型景观，其面积比和NH+4－N有显著的负相关关系，相关系数为-0.459。从景观水平上看，在本流域内景观格局指数与磷含量具有一定的相关性，各景观指数对与地形因素有关的水土侵蚀量较为敏感。斑块数（NP）、斑块密度（PD）和最大斑块指数（LSI）都与磷含量有明显的正相关，流域内斑块数量越多、景观类型和形状越复杂，水质越容易受到氮磷污染。 |
| 英文摘要: |
| 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, PO3-4－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 scattered distribution of landscape would cause more nutrient losses. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
