Effects of nitrogen deposition on soil organic carbon fractions in the subtropical forest ecosystems of S China

Chen, Xiaomei; Li, Yuelin; Mo, Jiangming; Otieno, Dennis; Tenhunen, John; Yan, Junhua; Liu, Juxiu; Zhang, Deqiang

doi:10.1002/jpln.201100059

Cited by 30 publications

(11 citation statements)

References 35 publications

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“…In contrast, N addition increased organic C pools in surface soils of QM, which agrees with several previous studies in China [44][45][46] . N is often the limiting nutrient in Northeast China, low levels of N addition generally increase plant production and the accumulation of soil organic matter, thus increasing the forest C sequestration [47] .…”

Section: Discussionsupporting

confidence: 92%

Divergent responses of soil carbon and nitrogen pools to short-term nitrogen addition between two plantations in Northeast China

Li¹,

Wang²,

Dou³

et al. 2019

International Journal of Agricultural and Biological Engineering

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Nitrogen (N) deposition has a profound influence on forest soil carbon (C) and N pools, but there was no consensus on the responses of different C and N components in different forest types. In this study, a two-year simulated N deposition experiment with four levels of N (NH 4 NO 3)-addition treatments (0, 50, 100, and 150 kg N/hm 2 • a) were conducted in Larix gmelinii (LG) and Quercus mongolica (QM) plantation in Northeast China, in order to investigate the C and N pool dynamics under continuously enhanced N deposition. Soil organic carbon (SOC), soil total N (STN) and their active components (readily oxidizable C, ROC; dissolved organic C, DOC; microbial biomass C, MBC, dissolved organic N, DON; microbial biomass N, MBN) of the forest soil were measured monthly from May to October 2017. C and N contents in LG were observed higher than in QM. N addition had no effect on SOC and STN of LG, but significantly increased SOC and STN of QM at low N addition level. Low N addition generally raised active C components (ROC, DOC, and MBC) in both plantations, whereas high N addition did not significantly affect these components, or even decreased ROC in LG soil. Low N addition also increased STN and MBN of QM, while no significant change in STN and MBN of LG was observed. DON was directly affected by N addition and increased significantly with elevated N addition levels. The results indicated that N addition, especially of low rate, might enhance the C sequestration capacity of the forest soils and mitigate climate change.

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Section: Discussionsupporting

confidence: 92%

Divergent responses of soil carbon and nitrogen pools to short-term nitrogen addition between two plantations in Northeast China

Li¹,

Wang²,

Dou³

et al. 2019

International Journal of Agricultural and Biological Engineering

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“…Alkyl C in the soil originates from lyophobic materials, such as methyl, waxes, cutins, lipids, and other components, which are extremely difficult to decompose 50 , 51 . A greater litter amount and decomposition rate may explain the recalcitrant C accumulation in the BF 52 . Lower aromatic C in the BF than in the PF is partly determined by less coniferous trees in the BF.…”

Section: Discussionmentioning

confidence: 97%

Recalcitrant carbon components in glomalin-related soil protein facilitate soil organic carbon preservation in tropical forests

Zhang

Tang

Zhong

et al. 2017

Sci Rep

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Glomalin-related soil protein (GRSP) is known as an important microbial by-product which is crucial for preserving or accumulating soil organic carbon (SOC). However, the underlying mechanisms are not well understood. In this study, we investigated the chemical structures of GRSP and its relationship with SOC using 13C nuclear magnetic resonance (NMR) in three tropical forests. The three forests, including a planted forest (PF), a secondary forest (MF) and a primary forest (BF), were selected to represent the natural successional process after disturbance in southern China. Results showed that the average concentrations of GRSP were (3.94 ± 1.09) mg cm−3 and accounting for (3.38 ± 1.15)% of the SOC in the top 10 cm soil. NMR analysis indicated rich aromatic C (~30%) and carboxyl C (~40%) in GRSP, and abundant alkyl C (~30%) and O-alkyl C (~50%) in SOC. The recalcitrance indexes (RI), as defined as the ratio of sum of alkyl C and aromatic C over sum of O-alkyl C and carboxyl C, was (98.6 ± 18.9)%, (145.5 ± 10.9)% and (20.7 ± 0.3)% in GRSP higher than that in SOC in the PF, MF and BF, respectively. This study demonstrated that the stubborn structure of GRSP probably regulate the resistance of SOC sequestration in tropical forests, especially in the planted and secondary forests.

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“…This produces a considerable proportion (on average 36.7%) of R abiotic to R soil in the studied soil (Table 1 ), highlighting a necessity to investigate abiotic soil CO 2 emission even in those fertile soils with relatively high biotic activities. This observation may be supported by the result that the studied soil contains a considerable proportion of chemical readily-oxidizable SOC that may be easily degraded by abiotic processes [ 20 , 21 ].…”

Section: Resultsmentioning

confidence: 85%

Influences of temperature and moisture on abiotic and biotic soil CO2 emission from a subtropical forest

Chen

Liu

et al. 2021

Carbon Balance Manage

Self Cite

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Background Soil CO2 efflux is considered to mainly derive from biotic activities, while potential contribution of abiotic processes has been mostly neglected especially in productive ecosystems with highly active soil biota. We collected a subtropical forest soil to sterilize for incubation under different temperature (20 and 30 °C) and moisture regimes (30%, 60 and 90% of water holding capacity), aiming to quantify contribution of abiotic and biotic soil CO2 emission under changing environment scenarios. Main findings: Results showed that abiotic processes accounted for a considerable proportion (15.6−60.0%) of CO2 emission in such a biologically active soil under different temperature and moisture conditions, and the abiotic soil CO2 emission was very likely to derive from degradation of soil organic carbon via thermal degradation and oxidation of reactive oxygen species. Furthermore, compared with biotically driving decomposition processes, abiotic soil CO2 emission was less sensitive to changes in temperature and moisture, causing reductions in proportion of the abiotic to total soil CO2 emission as temperature and moisture increased. Conclusions These observations highlight that abiotic soil CO2 emission is unneglectable even in productive ecosystems with high biological activities, and different responses of the abiotic and biotic processes to environmental changes could increase the uncertainty in predicting carbon cycling.

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Effects of nitrogen deposition on soil organic carbon fractions in the subtropical forest ecosystems of S China

Cited by 30 publications

References 35 publications

Divergent responses of soil carbon and nitrogen pools to short-term nitrogen addition between two plantations in Northeast China

Divergent responses of soil carbon and nitrogen pools to short-term nitrogen addition between two plantations in Northeast China

Recalcitrant carbon components in glomalin-related soil protein facilitate soil organic carbon preservation in tropical forests

Influences of temperature and moisture on abiotic and biotic soil CO2 emission from a subtropical forest

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