...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ecosystems >The Influence of Land Use on Lake Nutrients Varies with Watershed Transport Capacity
【24h】

The Influence of Land Use on Lake Nutrients Varies with Watershed Transport Capacity

机译：土地利用对流域输水能力的湖泊养分变化的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nutrient loading to lakes depends on both the availability of nutrients in a watershed and their potential for movement to a lake. Many studies have demonstrated that variation in watershed land use can translate to differences in lake water quality by affecting nutrient availability. There have been few attempts, however, to understand how loading to surface waters is affected by land use when there are differences in watershed transport capacity. We compared the relationship between land use/cover and lake nutrients in lakes draining watersheds that exhibited high and low transport capacity using a 5 year (2001-2005) dataset describing the chemistry of 101 lakes and reservoirs in a region of intensive agriculture. We measured watershed transport capacity by compositing the hydrologic, geologic, and topographic variables correlated with interannual variability in lake total nitrogen (TN) or phosphorus (TP) because the hydrologic permeability of watersheds amplifies downstream responses to rainfall events. Factors describing watershed transport capacity differed for TN and TP, consistent with differences in nutrient mobility and biogeochemistry. Partial least squares regression revealed that watershed transport capacity influenced the nature of the association between land use/cover and lake chemistry. In watersheds with low transport capacity, in-lake processes and near-shore land use/cover tended to be more influential, whereas, in watersheds with high transport capacity, land use/cover across the entire watershed was important for explaining lake chemistry. Thus, although land use is a key driver of nutrient loading to lakes, the extent to which it influences water quality can vary with watershed transport capacity.
机译：湖泊中的养分含量既取决于流域中养分的可用性，又取决于其向湖泊迁移的潜力。许多研究表明，流域土地利用的变化可以通过影响营养物的利用而转化为湖泊水质的差异。然而，很少有尝试来了解当流域运输能力存在差异时，土地利用如何影响地表水负荷。我们使用5年（2001年至2005年）数据集，描述了集约化农业地区101个湖泊和水库的化学性质，比较了土地流失率高，迁移能力低的流域湖泊中土地利用/覆盖与湖泊养分之间的关​​系。我们通过综合与湖泊总氮（TN）或磷（TP）的年际变化相关的水文，地质和地形变量来衡量流域的运输能力，因为流域的水文渗透性会放大下游对降雨事件的响应。 TN和TP描述流域运输能力的因素不同，这与养分迁移率和生物地球化学的差异一致。偏最小二乘回归表明，流域的运输能力影响了土地利用/覆盖与湖泊化学之间联系的性质。在运输能力低的流域中，湖内过程和近岸土地利用/覆盖往往更具影响力，而在运输能力高的流域中，整个流域的土地利用/覆盖对于解释湖泊化学很重要。因此，尽管土地利用是养分流向湖泊的关键驱动力，但其对水质的影响程度却会随分水岭的运输能力而变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号