[张贴报告]Unraveling the drivers for interannual variabilities of N2O fluxes from forests soils across climatic zones

Unraveling the drivers for interannual variabilities of N2O fluxes from forests soils across climatic zones
编号:136 稿件编号:84 访问权限:仅限参会人 更新:2024-08-15 15:20:26 浏览:80次 张贴报告

报告开始:2024年08月17日 08:19 (Asia/Shanghai)

报告时间:1min

所在会议:[P] 张贴报告 » [P1] 张贴报告

暂无文件

摘要
Forest soils are an important source of nitrous oxide (N2O), however, field observations of N2O emission have often exhibited large variabilities when compared with managed agricultural lands. In the last decade, the number of forest N2O studies has increased more than tenfold, but only few of them have looked into the interannual flux variabilities from regional scale. Here, we have collected 30 long-term N2O monitoring studies (≥ 2 years) based on global database, and extracted variabilities (VARFlux) as well as relative variabilities (VAR%, in proportions) of annual N2O fluxes. The relationship of mean annual precipitation (MAP), mean annual temperature (MAT), and nitrogen (N) deposition with flux variabilities was examined to explore the underlying mechanisms for N2O emission on the long-term scale. Our results show that mean VARFlux is 0.43 kg N ha-1 yr-1 and VAR% is 28.68%. Across climatic zones, the subtropical forests have the largest annual N2O fluxes, as well as the largest fluctuations among annual budgets, while the tropics were the smallest. We found that the regulating factors for VARFlux and VAR% are fundamentally different, i.e., MAT and N input determine the annual fluxes as well as VARFlux while MAP and other limiting soil parameters determine VAR%. The relative contributions of different seasons to flux variabilities were also explored, indicating that N2O fluxes of warm and cool seasons are more responsible for the fluctuations in annual fluxes of the (sub)tropical and temperate forests, respectively. Overall, despite the limitation in interpretations due to few long-term studies from literature, this work highlights that significant interannual variabilities are common phenomenon for N2O emission from different climatic zones forest soils; by unraveling the divergent drivers for VARFlux and VAR%, we have provided the possibility of improving N2O simulation models for constraining the heterogeneity of N2O emission processes from climatic zones forest soils.

 
关键字
报告人
黄媛媛
博士研究生 清华大学深圳国际研究生院

稿件作者
黄媛媛 清华大学深圳国际研究生院
余龙飞 清华大学深圳国际研究生院
发表评论
验证码 看不清楚,更换一张
全部评论
注册参会 提交稿件