Patterns and drivers of atmospheric nitrogen deposition retention in global forests,Global Change Biology

当前位置： X-MOL 学术 › Glob. Change Biol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Patterns and drivers of atmospheric nitrogen deposition retention in global forests
Global Change Biology ( IF 10.8 ) Pub Date : 2024-07-09 , DOI: 10.1111/gcb.17410
Quanhong Lin _{1,

2} , Jianxing Zhu ₁ , Qiufeng Wang _{1,

2} , Qiongyu Zhang ₃ , Guirui Yu _{1,

2}

Affiliation

Forests are the largest carbon sink in terrestrial ecosystems, and the impact of nitrogen (N) deposition on this carbon sink depends on the fate of external N inputs. However, the patterns and driving factors of N retention in different forest compartments remain elusive. In this study, we synthesized 408 observations from global forest 15N tracer experiments to reveal the variation and underlying mechanisms of 15N retention in plants and soils. The results showed that the average total ecosystem 15N retention in global forests was 63.04 ± 1.23%, with the soil pool being the main N sink (45.76 ± 1.29%). Plants absorbed 17.28 ± 0.83% of 15N, with more allocated to leaves (5.83 ± 0.63%) and roots (5.84 ± 0.44%). In subtropical and tropical forests, 15N was mainly absorbed by plants and mineral soils, while the organic soil layer in temperate forests retained more 15N. Additionally, forests retained more than , primarily due to the stronger capacity of the organic soil layer to retain . The mechanisms of 15N retention varied among ecosystem compartments, with total ecosystem 15N retention affected by N deposition. Plant 15N retention was influenced by vegetative and microbial nutrient demands, while soil 15N retention was regulated by climate factors and soil nutrient supply. Overall, this study emphasizes the importance of climate and nutrient supply and demand in regulating forest N retention and provides data to further explore the impacts of N deposition on forest carbon sequestration.

中文翻译：

全球森林大气氮沉降滞留的模式和驱动因素

森林是陆地生态系统中最大的碳汇，氮（N）沉积对该碳汇的影响取决于外部氮输入的命运。然而，不同森林区划中氮保留的模式和驱动因素仍然难以捉摸。在这项研究中，我们综合了来自全球森林的 408 个观察结果15 N示踪剂实验揭示了变异和潜在机制15植物和土壤中的氮保留。结果表明，平均生态系统总量15全球森林的氮保留率为63.04±1.23%，其中土壤库是主要的氮汇（45.76±1.29%）。植物吸收了 17.28 ± 0.83% 15 N，更多分配给叶（5.83±0.63%）和根（5.84±0.44%）。在亚热带和热带森林中， 15氮主要被植物和矿质土壤吸收，而温带森林的有机土层保留较多15另外，森林保留量多，主要是由于有机土层保留能力较强。其机制15不同生态系统区划的氮保留量各不相同，整个生态系统15氮保留受氮沉积影响。植物15氮保留受到植物和微生物养分需求的影响，而土壤15氮保留受气候因素和土壤养分供应的调节。总体而言，本研究强调了气候和养分供需在调节森林氮保留方面的重要性，并为进一步探讨氮沉降对森林碳汇的影响提供了数据。

更新日期：2024-07-09

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南