Long-term leaf C:N ratio change under elevated CO2 and nitrogen deposition in China: Evidence from observations and process-based modeling

Sheng, Mingyang; Tang, Jinyun; Yang, Dawen; Fisher, Joshua B.; Wang, Han; Kattge, Jens

doi:10.1016/j.scitotenv.2021.149591

Long-term leaf C:N ratio change under elevated CO₂ and nitrogen deposition in China: Evidence from observations and process-based modeling

Journal Article · Wed Aug 11 00:00:00 EDT 2021 · Science of the Total Environment

DOI:https://doi.org/10.1016/j.scitotenv.2021.149591· OSTI ID:1902284

Sheng, Mingyang ^[1]; Tang, Jinyun ^[2]; Yang, Dawen ^[1]; Fisher, Joshua B. ^[3]; Wang, Han ^[1]; Kattge, Jens ^[4]

Tsinghua Univ., Beijing (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States)
Max-Planck-Institute for Biogeochemistry, Jena (Germany)

Climate change, elevating atmosphere CO₂ (eCO₂) and increased nitrogen deposition (iNDEP) are altering the biogeochemical interactions between plants, microbes and soils, which further modify plant leaf carbon-nitrogen (C:N) stoichiometry and their carbon assimilation capability. Many field experiments have observed large sensitivity of leaf C:N ratio to eCO₂ and iNDEP. However, the large-scale pattern of this sensitivity is still unclear, because eCO₂ and iNDEP drive leaf C:N ratio toward opposite directions, which are further compounded by the complex processes of nitrogen acquisition and plant-and-microbial nitrogen competition. Here, we attempt to map the leaf C:N ratio spatial variation in the past 5 decades in China with a combination of data-driven model and process-based modeling. These two approaches showed consistent results. Over different regions, we found that leaf C:N ratio had significant but uneven changes between 2 time periods (1960-1989 and 1990-2015): a 5% ± 8% increase for temperate grasslands in northern China, a 3% ± 6% increase for boreal grasslands in western China, and by contrast, a 7% ± 6% decrease for temperate forests in southern China, and a 3% ± 5% decrease for boreal forests in northeastern China. Additionally, the structural equation models indicated that the leaf C:N change was sensitive to ΔNDEP, ΔCO₂ and ΔMAT rather than ΔMAP and ecosystem types. In this work, process-based modeling suggested that iNDEP was the main source of soil mineral nitrogen change, dominating leaf C:N ratio change in most areas in China, while eCO₂ led to leaf C:N ratio increase in low iNDEP area. This study also indicates that the long-term leaf C:N ratio acclimation was dominated by climate constraint, especially temperature, but was constrained by soil N availability over decade scale.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1902284

Alternate ID(s):: OSTI ID: 1862533

Journal Information:: Science of the Total Environment, Journal Name: Science of the Total Environment Vol. 800; ISSN 0048-9697

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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