文献类型：期刊文献

英文题名：Canopy nitrogen addition enhance the photosynthetic rate of canopy species by improving leaf hydraulic conductivity in a subtropical forest

作者：Wu, Guilin[1] Chen, Dexiang[1] Zhou, Zhang[1] Ye, Qing[2] Wu, Jianhui[1]

第一作者：Wu, Guilin

通信作者：Chen, DX[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Hainan Jianfengling Forest Ecosyst Natl Field Sci, Guangzhou, Peoples R China;[2]Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Eco, South China Bot Garden, Guangzhou, Peoples R China

年份：2022

卷号：13

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;Scopus(收录号：2-s2.0-85136477237);WOS:【SCI-EXPANDED(收录号:WOS:000844577200001)】；

基金：Funding This work was supported by the Central Public-Interest Scientific Institution Basal Research Fund (CAFYBB2020ZE002), the Forestry Science and Technology Innovation Project of Guangdong (2020KJCX006), the National Natural Science Foundation of China (41773071 and 31872701), and the Jianfengling National Key Field Station (2021132018).

语种：英文

外文关键词：canopy N addition; photosynthetic rate; leaf hydraulic conductivity; CO2 transportation distance; understory N addition

摘要：Elucidating the effects of atmospheric nitrogen (N) deposition on the photosynthetic capacity of plants is critical to understand forest growth and conservation under global change. However, studies on this topic generally consider only understory N addition, which ignores the effect of canopy interception. In this study, we conducted a field experiment in a subtropical forest to compare the effects of canopy vs. understory N addition on the photosynthetic rate of canopy and understory species. We found that canopy N addition enhanced the photosynthetic rate of canopy species by increasing leaf hydraulic conductivity and shortening the distance of CO2 transportation. In contrast, understory N addition had non-significant effects on the photosynthetic rate of canopy species. Moreover, the photosynthetic rate of understory species was not affected by canopy or understory N addition. Interestingly, changes in hydraulic conductivity contributed more to accelerating the photosynthetic rate than changes in CO2 transport distance. Our results provide important insights into the dissimilar effects of canopy and understory N addition on the photosynthetic rates of species in subtropical forests. Based on our findings, we highlighted the urgent need to consider canopy processes in future studies on N deposition.