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- W3147645360 abstract "Abstract Background Atmospheric nitrogen (N) deposition in boreal forest ecosystems increased gradually with the development of industry and agriculture, but the effects of N input on soil CO 2 fluxes in these ecosystems were rarely reported in previous studies. To evaluate the effect of N addition on soil respiration is of great significance for understanding the distribution of soil carbon (C) on the N gradient in forest ecosystems. Results In this study, four treatment levels of N addition (0, 25, 50, 75 kg N ha − 1 yr − 1 ) were applied to natural Larix gmelinii forest in Greater Khingan Mountains of northeast China. We focused mainly on the dynamics of soil respiration (Rs), heterotrophic respiration (Rh), autotrophic respiration (Ra), microbial biomass C and N (MBC and MBN) and fine root biomass (FRB) in a growing season. We found that low N addition significant increased Rs, Rh and Ra, but with the increase of N addition, the promotion effect was gradually weakened. Medium N increased the temperature sensitivity (Q 10 ) of Rs and Rh components, while medium N and high N significantly reduced the Q 10 of Ra. Ra was positively correlated with FRB; Rh was positively correlated with soil MBC and MBN; and R S was probably driven by Ra from May to July, while by Rh in August and September. Conclusions Long-term N addition alleviated microbial N limitation, promoted soil respiration and accelerated soil C and N cycle in boreal forest ecosystems." @default.
- W3147645360 created "2021-04-13" @default.
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- W3147645360 date "2020-08-13" @default.
- W3147645360 modified "2023-09-24" @default.
- W3147645360 title "Effects of long-term nitrogen addition on soil respiration and its components in a boreal forest" @default.
- W3147645360 doi "https://doi.org/10.21203/rs.3.rs-57463/v1" @default.
- W3147645360 hasPublicationYear "2020" @default.
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