Overestimated nitrogen loss from denitrification for natural terrestrial ecosystems in CMIP6 Earth System Models

被引:16
作者
Feng, Maoyuan [1 ,2 ,3 ]
Peng, Shushi [1 ,2 ,3 ]
Wang, Yilong [4 ]
Ciais, Philippe [5 ,6 ]
Goll, Daniel S. [5 ]
Chang, Jinfeng [7 ]
Fang, Yunting [8 ]
Houlton, Benjamin Z. [9 ,10 ]
Liu, Gang [1 ,2 ,3 ]
Sun, Yan [11 ]
Xi, Yi [1 ,2 ,5 ]
机构
[1] Peking Univ, Sino French Inst Earth Syst Sci, Coll Urban & Environm Sci, Beijing, Peoples R China
[2] Peking Univ, Lab Earth Surface Proc, Beijing, Peoples R China
[3] Peking Univ, Inst Carbon Neutral, Beijing, Peoples R China
[4] Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Resources, Beijing, Peoples R China
[5] Univ Paris Saclay, Lab Sci Climat & Environm, LSCE IPSL, CEA CNRS UVSQ, Gif Sur Yvette, France
[6] Cyprus Inst, 20 Konstantinou Kavafi St, CY-2121 Nicosia, Cyprus
[7] Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou, Peoples R China
[8] Chinese Acad Sci, Inst Appl Ecol, CAS Key Lab Forest Ecol & Management, Shenyang, Peoples R China
[9] Cornell Univ, Dept Ecol & Evolutionary Biol, CALS, Ithaca, NY USA
[10] Cornell Univ, Dept Global Dev, CALS, Ithaca, NY USA
[11] Ocean Univ China, Coll Marine Life Sci, Qingdao, Peoples R China
基金
中国国家自然科学基金;
关键词
LIMITATION; RESPONSES; PATTERNS; CARBON; LAND; DELTA-N-15; CYCLE;
D O I
10.1038/s41467-023-38803-z
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Nitrogen loss due to soil denitrification in global natural ecosystems is quantified using an isotope-benchmarking method, and is overestimated by almost two times in the current earth system models. Denitrification and leaching nitrogen (N) losses are poorly constrained in Earth System Models (ESMs). Here, we produce a global map of natural soil N-15 abundance and quantify soil denitrification N loss for global natural ecosystems using an isotope-benchmarking method. We show an overestimation of denitrification by almost two times in the 13 ESMs of the Sixth Phase Coupled Model Intercomparison Project (CMIP6, 73 +/- 31 Tg N yr(-1)), compared with our estimate of 38 +/- 11 Tg N yr(-1), which is rooted in isotope mass balance. Moreover, we find a negative correlation between the sensitivity of plant production to rising carbon dioxide (CO2) concentration and denitrification in boreal regions, revealing that overestimated denitrification in ESMs would translate to an exaggeration of N limitation on the responses of plant growth to elevated CO2. Our study highlights the need of improving the representation of the denitrification in ESMs and better assessing the effects of terrestrial ecosystems on CO2 mitigation.
引用
收藏
页数:9
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