• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Global Biogeochemical Cycles >Carbon evasion/accumulation ratio in boreal lakes is linked to nitrogen
【24h】

Carbon evasion/accumulation ratio in boreal lakes is linked to nitrogen

机译：北方湖泊的碳逃逸/积累比与氮有关

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

The role of lakes in landscape carbon (C) cycling and primary drivers behind freshwater C balance have remained poorly known, although lakes are an important landscape component and cover 10% of Finland's total area. We studied CO_2 evasion and average Holocene C accumulation in 82 boreal lakes (0.04-1540 km~2; max depth 1-93 m) located between the latitudes 60°N and 69°N. Both CO_2 evasion and C accumulation correlated with numerous drivers and were closely linked to lake area and maximum depth. The total aquatic C retention (C evasion + C accumulation) was largely determined by lake area (r~2 = 0.96, p < 0.0001). Carbon in boreal lakes is mostly terrestrially fixed and our data demonstrate that boreal lakes are important conduits for transferring terrestrially fixed C to the atmosphere. C evasion/accumulation ratio (C_(ev)/C_(acc)) ranged from 4 to 86 (on average 30) and correlated positively only with lake water NO _3-N concentration and maximum depth, and negatively with sediment N pool. Numerous possible important drivers like land use and climate as well as lake physical and chemical characteristics were compared to C balances. Our study might thus be valuable in trying to understand links between aquatic and terrestrial C cycling over boreal landscapes. Although climatic drivers generally play a key role in short-term C balance fluctuations, our data indicate nitrogen/fertility to be a key contributing factor to long term C balance - increasing C_(ev)/C_(acc) and thus decreasing the role of lakes in landscape C sequestration in boreal zone.
机译：尽管湖泊是景观的重要组成部分，占芬兰总面积的10％，但湖泊在景观碳（C）循环中的作用以及淡水C平衡背后的主要驱动力仍然知之甚少。我们研究了北纬60°N和69°N之间的82个北方湖泊（0.04-1540 km〜2;最大深度1-93 m）的CO_2逃逸和平均全新世C积累。 CO_2的逃逸和C的积累都与众多驱动因素有关，并且与湖泊面积和最大深度密切相关。水生碳的总保留量（逃逸+碳积累）很大程度上取决于湖泊面积（r〜2 = 0.96，p <0.0001）。北方湖泊中的碳大部分是在陆地上固定的，我们的数据表明，北方湖泊是将陆地上固定的C转移到大气中的重要管道。溶蚀/富集比（C_（ev）/ C_（acc））介于4到86（平均30）之间，仅与湖水NO _3-N浓度和最大深度呈正相关，与沉积物N池呈负相关。将许多可能的重要驱动因素（如土地利用和气候以及湖泊的物理和化学特性）与碳平衡进行了比较。因此，我们的研究对于试图了解北方地区的水生和陆地C循环之间的联系可能是有价值的。尽管气候驱动因素通常在短期碳平衡波动中起关键作用，但我们的数据表明氮/肥力是长期碳平衡的关键因素-增加C_（ev）/ C_（acc），从而降低了C_（ev）/ C_（acc）。湖泊C隔离在北方带。

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