Elevated CO2 negates O3 impacts on terrestrial carbon and nitrogen cycles

Xia, Longlong; Lam, Shu Kee; Kiese, Ralf; Chen, De-Li; Luo, Yiqi; Groenigen, Kees Jan van; Ainsworth, Elizabeth A.; Chen, Ji; Liu, Shuwei; Ma, Lei; Zhu, Yuhao; Butterbach‐Bahl, Klaus

doi:10.1016/j.oneear.2021.11.009

Cited by 52 publications

(29 citation statements)

References 59 publications

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“…Clay, Sand, MAT, and MAP) that affected N 2 O emissions were the same for both forest and grassland (Table 2). These factors also have been proven to have significant effects on N 2 O emissions by the other studies (13,24,45). Moreover, the N 2 O emissions from both forest and grassland had a negative relationship with pH, which was in consistent with previous studies (46,47).…”

Section: Discussionsupporting

confidence: 89%

Global variations and drivers of nitrous oxide emissions from forests and grasslands

Yu¹,

Zhang²,

Tian³

et al. 2022

Front. Soil Sci.

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Nitrous oxide (N2O) emissions are highly variable due to the complex interaction of climatic and ecological factors. Here, we obtained in-situ annual N2O emission flux data from almost 180 peer-papers to evaluate the dominant drivers of N2O emissions from forests and unfertilized grasslands at a global scale. The average value of N2O emission fluxes from forest (1.389 kg Nha-1yr-1) is almost twice as large as that from grassland (0.675 kg Nha-1yr-1). Soil texture and climate are the primary drivers of global forest and grassland annual N2O emissions. However, the best predictors varied according to land use and region. Soil clay content was the best predictor for N2O emissions from forest soils, especially in moist or wet regions, while soil sand content predicted N2O emissions from dry or moist grasslands in temperate and tropical regions best. Air temperature was important for N2O emission from forest, while precipitation was more efficient in grassland. This study provides an overall understanding of the relationship between natural N2O emissions and climatic and environmental variables. Moreover, the identification of principle factors for different regions will reduce the uncertainty range of N2O flux estimates, and help to identify region specific climate change mitigation and adaptation strategies.

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Section: Discussionsupporting

confidence: 89%

Global variations and drivers of nitrous oxide emissions from forests and grasslands

Yu¹,

Zhang²,

Tian³

et al. 2022

Front. Soil Sci.

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“…Similar findings were reported in other previous studies (e.g. Du et al 2020) and are often ascribed to the dilution effect, as a result of high accumulation of biomass and nonstructural carbohydrates (Xia et al 2021). The higher C:N in non-leguminous trees relative to leguminous trees could be explained largely by low decline in leaf N for the latter compared to the former.…”

Section: Influence Of Woody Plant Functional Traits On Responses To Ecosupporting

confidence: 92%

A global meta-analysis of woody plant responses to elevated CO2: implications on biomass, growth, leaf N content, photosynthesis and water relations

et al. 2022

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Background Atmospheric CO2 may double by the year 2100, thereby altering plant growth, photosynthesis, leaf nutrient contents and water relations. Specifically, atmospheric CO2 is currently 50% higher than pre-industrial levels and is projected to rise as high as 936 μmol mol−1 under worst-case scenario in 2100. The objective of the study was to investigate the effects of elevated CO2 on woody plant growth, production, photosynthetic characteristics, leaf N and water relations. Methods A meta-analysis of 611 observations from 100 peer-reviewed articles published from 1985 to 2021 was conducted. We selected articles in which elevated CO2 and ambient CO2 range from 600–1000 and 300–400 μmol mol−1, respectively. Elevated CO2 was categorized into < 700, 700 and > 700 μmol mol−1 concentrations. Results Total biomass increased similarly across the three elevated CO2 concentrations, with leguminous trees (LTs) investing more biomass to shoot, whereas non-leguminous trees (NLTs) invested to root production. Leaf area index, shoot height, and light-saturated photosynthesis (Amax) were unresponsive at < 700 μmol mol−1, but increased significantly at 700 and > 700 μmol mol−1. However, shoot biomass and Amax acclimatized as the duration of woody plants exposure to elevated CO2 increased. Maximum rate of photosynthetic Rubisco carboxylation (Vcmax) and apparent maximum rate of photosynthetic electron transport (Jmax) were downregulated. Elevated CO2 reduced stomatal conductance (gs) by 32% on average and increased water use efficiency by 34, 43 and 63% for < 700, 700 and > 700 μmol mol−1, respectively. Leaf N content decreased two times more in NLTs than LTs growing at elevated CO2 than ambient CO2. Conclusions Our results suggest that woody plants will benefit from elevated CO2 through increased photosynthetic rate, productivity and improved water status, but the responses will vary by woody plant traits and length of exposure to elevated CO2.

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“…If the Q B was significant ( p < .05), there was large heterogeneity between categorical groups (plant types, root environments, and fumigation methods). The difference between the means of groups was considered to be significant if their 95% CIs did not overlap (Hu et al, 2022; Xia et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

Elevated ozone decreases the multifunctionality of belowground ecosystems

Wang

2022

Global Change Biology

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As one of the most detrimental air pollutants, tropospheric ozone (O 3 ) levels have increased by 30%-70% in the midlatitude region of the Northern Hemisphere since the mid-20th century (IPCC, 2021).Although O 3 is declining in some urban areas of Europe and the United States due to effective control measures of O 3 -precursor emissions, ground O 3 levels still maintain a rising trend globally according to monitoring site data (

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Elevated CO2 negates O3 impacts on terrestrial carbon and nitrogen cycles

Abstract: Highlights d e[O 3 ] decreases terrestrial C and N pools and fluxes d e[CO 2 ] increases terrestrial C and N pools and fluxes d e[CO 2 ] negates e[O 3 ] impacts on terrestrial C and N pools and fluxes d Evaluating terrestrial C and N feedbacks to concurrent climate changes is critical

Cited by 52 publications

References 59 publications

Global variations and drivers of nitrous oxide emissions from forests and grasslands

Global variations and drivers of nitrous oxide emissions from forests and grasslands

A global meta-analysis of woody plant responses to elevated CO2: implications on biomass, growth, leaf N content, photosynthesis and water relations

Elevated ozone decreases the multifunctionality of belowground ecosystems

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