• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Global Biogeochemical Cycles >Nitrogen availability links forest productivity, soil nitrous oxide and nitric oxide fluxes of a tropical montane forest in southern Ecuador
【24h】

Nitrogen availability links forest productivity, soil nitrous oxide and nitric oxide fluxes of a tropical montane forest in southern Ecuador

机译：氮的供应将厄瓜多尔南部热带山地森林的森林生产力，土壤一氧化二氮和一氧化氮通量联系起来

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

Tropical forests are important sources of the greenhouse gas nitrous oxide (N _2O) and of nitric oxide (NO), a precursor of ozone. In tropical montane forests nitrogen limitation is common which affects both soil N _2O and NO fluxes and forest productivity. Here we present evidence that forest productivity and N-oxide (N _2O + NO) fluxes are linked through N availability along elevation and topographic gradients in tropical montane forests. We measured N-oxide fluxes, several indices of N availability, and forest productivity along an elevation gradient from 1000 m to 3000 m and along topographic gradients. Organic layer thickness of the soils increased and N availability decreased with increasing elevation and along the topographic gradient from the lower slope position to the ridges. Annual N _2O fluxes ranged from-0.53 g(N)m ~(-2)h ~(-1) to 14.54 g(N)m ~(-2)h ~(-1) while NO fluxes ranged from-0.02 g(N)m ~(-2)h ~(-1) to 1.13 g(N)m ~(-2)h ~(-1). Both N-oxide fluxes and forest productivity increased with increasing N availability and showed close positive correlations with indices of N availability (C/N ratio and δ ~(15)N signature of litterfall). We interpret the close correlations of N-oxide fluxes with total litterfall and tree basal area increment as evidence that N availability links N-oxide fluxes and forest productivity. This opens the possibility to include forest productivity as co-variable in predictions of N-oxide fluxes in nitrogen limited tropical montane forests. Especially increment of tree basal area was a promising proxy to predict soil N-oxide fluxes in these N limited ecosystems, possibly because it better reflects long-term forest productivity than total litterfall.
机译：热带森林是温室气体一氧化二氮（N _2O）和一氧化氮（NO）（臭氧的前体）的重要来源。在热带山地森林中，氮限制很普遍，它会影响土壤N _2O和NO的通量以及森林的生产力。在这里，我们提供证据表明，森林生产力和N-氧化物（N _2O + NO）通量是通过热带山地森林中海拔高度和地形梯度上的N有效性与氮含量相关的。我们测量了沿1000 m至3000 m的海拔梯度以及沿地形梯度的N氧化物通量，N有效性的几个指标以及森林生产力。土壤的有机层厚度随着海拔的升高以及从较低坡度位置到山脊的地形梯度的增加而增加，而氮的有效性下降。年N _2O通量范围为-0.53 g（N）m〜（-2）h〜（-1）至14.54 g（N）m〜（-2）h〜（-1），而NO通量范围为-0.02 g （N）m〜（-2）h〜（-1）至1.13 g（N）m〜（-2）h〜（-1）。氮素通量和森林生产力都随着氮素有效性的增加而增加，并且与氮素有效性指数（C / N比和凋落物的δ〜（15）N特征）密切相关。我们解释了氮氧化物通量与凋落物总量和树木基础面积增加的紧密相关性，以此作为氮素有效性将氮氧化物通量与森林生产力联系起来的证据。这为将森林生产力作为协变量纳入氮受限的热带山地森林中的氮氧化物通量的预测开辟了可能性。尤其是树木基部面积的增加是预测这N个有限生态系统中土壤N氧化物通量的有前途的代理，这可能是因为它比总凋落物更好地反映了长期森林生产力。

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