文献类型：期刊文献

英文题名：Drivers of foliar N-15 trends in southern China over the last century

作者：Tang, Songbo[1,2,3,4] Liu, Jianfeng[5] Gilliam, Frank S.[6] Hietz, Peter[7] Wang, Zhiheng[8] Lu, Xiankai[1,2] Zeng, Feiyan[1] Wen, Dazhi[1,2,3] Hou, Enqing[1,2] Lai, Yuan[1,2,3] Fang, Yunting[9] Tu, Ying[4,9] Xi, Dan[9] Huang, Zhiqun[10] Zhang, Dianxiang[1] Wang, Rong[11] Kuang, Yuanwen[1,2,3]

第一作者：Tang, Songbo

通信作者：Zhang, DX[1];Kuang, YW[1];Kuang, YW[2];Hietz, P[3]

机构：[1]Chinese Acad Sci, South China Bot Garden, Guangzhou 510650, Peoples R China;[2]South China Bot Garden, Guangdong Prov Key Lab Appl Bot, Guangzhou, Peoples R China;[3]Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 510650, Peoples R China;[4]Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China;[5]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat Natl Forestry &, Beijing, Peoples R China;[6]Univ West Florida, Dept Biol, Pensacola, FL USA;[7]Univ Nat Resources & Life Sci, Inst Bot, A-1180 Vienna, Austria;[8]Peking Univ, Inst Ecol & Key Lab Earth Surface Proc, Coll Urban & Environm Sci, Minist Educ, Beijing, Peoples R China;[9]Chinese Acad Sci, Inst Appl Ecol, Key Lab Forest Ecol & Management, Shenyang, Peoples R China;[10]Fujian Normal Univ, Coll Geog Sci, Fuzhou, Peoples R China;[11]Fudan Univ, Shanghai Key Lab Atmospher Particle Pollut & Prev, Dept Environm Sci & Engn, Shanghai, Peoples R China

年份：0

外文期刊名：GLOBAL CHANGE BIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000812908800001)】；

基金：National Natural Science Foundation of China, Grant/Award Number: 41771522; the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory, Grant/Award Number: GML2019ZD0408

语种：英文

外文关键词：atmospheric CO(2)global change; foliar nitrogen concentrations; foliar nitrogen isotopes; nitrogen availability; nitrogen deposition

摘要：Foliar stable nitrogen (N) isotopes (delta N-15) generally reflect N availability to plants and have been used to infer about changes thereof. However, previous studies of temporal trends in foliar delta N-15 have ignored the influence of confounding factors, leading to uncertainties on its indication to N availability. In this study, we measured foliar delta N-15 of 1811 herbarium specimens from 12 plant species collected in southern China forests from 1920 to 2010. We explored how changes in atmospheric CO2, N deposition and global warming have affected foliar delta N-15 and N concentrations ([N]) and identified whether N availability decreased in southern China. Across all species, foliar delta N-15 significantly decreased by 0.82 parts per thousand over the study period. However, foliar [N] did not decrease significantly, implying N homeostasis in forest trees in the region. The spatiotemporal patterns of foliar delta N-15 were explained by mean annual temperature (MAT), atmospheric CO2 (PCO2$$ {\mathrm{P}}_{{\mathrm{CO}}_2} $$), atmospheric N deposition, and foliar [N]. The spatiotemporal trends of foliar [N] were explained by MAT, temperature seasonality, PCO2$$ {\mathrm{P}}_{{\mathrm{CO}}_2} $$, and N deposition. N deposition within the rates from 5.3 to 12.6 kg N ha(-1) year(-1) substantially contributed to the temporal decline in foliar delta N-15. The decline in foliar delta N-15 was not accompanied by changes in foliar [N] and therefore does not necessarily reflect a decline in N availability. This is important to understand changes in N availability, which is essential to validate and parameterize biogeochemical cycles of N.