Addition of nitrogen enhances stability of soil organic matter in a temperate forest

Chen, Z. J.; Geng, Shicong; Zhang, J. H.; Setälä, Heikki; Gu, Yue; Wang, F.; Zhang, X.; Wang, X. X.; Han, Shijie

doi:10.1111/ejss.12404

Cited by 32 publications

(22 citation statements)

References 40 publications

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“…LF is a thick and unstable OM, so that its content in the soil tends to be affected by rapid changes that is, influenced by the historical management of soil and forest (Huygens et al, 2005;Dube et al, 2009). The historical processes of logging and cattle grazing with possible greater frequency or intensity in OP cover, could cause less accumulation of OM in the soil, and lost in the physical protection, contributing to the loss of SOM labile (Chen et al, 2017). Our results indicated a LF quantity between 10 and 60 g LF·kg -1 dry soil ( Figure 4A), these values concur with results reported by Huygens et al (2005) for a secondary N. obliqua forest.…”

Section: Physical Fractionation Of Somsupporting

confidence: 89%

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Soil quality indicators in an Andisol under different tree covers in disturbed Nothofagus forests

Alfaro

Dubé²,

Zagal³

2018

Chil. j. agric. res.

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Non-systemic logging, cattle browsing and grazing with the site natural vegetation can modify tree covers in native forests and alter the quantity and quality of organic matter entering the soil and hence its overall quality. The objective of this study was to evaluate the effect of modifying tree covers by uncontrolled logging and grazing processes on soil quality, in a mature and unmanaged roble (Nothofagus obliqua (Mirb.) Blume) forest. Soil quality was evaluated under partly-closed (PC), partly-open (PO), and open (OP) forest covers, and two soil depths. The indicators used were soil organic C (SOC), potential net N mineralization (N-min), and nitrification (N-NO3), soil microbial respiration (SMR), microbial biomass C (MBC), soil aggregates, and light fraction (LF). At 0-5 cm soil depth SMR and MBC in PC cover was approximately 12% higher than in PO and OP covers. For the same soil depth N-min in PC cover was 68% and 95% higher than in PO and OP covers, respectively; and for N-NO3 PC cover was 45% higher than PO cover. OP tree cover presented a negative N-NO3 (immobilization). Dry weight for LF fraction in OP cover (labile OM) was 90% and 67% lower respect PC and PO covers, respectively (P < 0.05). The soil quality and the activity of its microbial processes were affected by alteration of tree cover, as well by the anthropic action of logging and extensive grazing, the soil in OP cover was the most affected.

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Section: Physical Fractionation Of Somsupporting

confidence: 89%

“…The interaction Depth × Fraction indicated that organic C content is sensitive to soil depth, or pedogenic or environmental characteristics between soil depths ( Figure 4C) (Zagal et al, 2013;Chen et al, 2017).…”

Section: Physical Fractionation Of Sommentioning

confidence: 99%

Soil quality indicators in an Andisol under different tree covers in disturbed Nothofagus forests

Alfaro

Dubé²,

Zagal³

2018

Chil. j. agric. res.

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“…The increased SOC content in fine materials may be due to the input of organic residues ( Fonte et al, 2009 ). At present, studies on the effect of soil available N on SOC in aggregates are mainly focused on farmland ecosystems, and no study on forestland system has been reported yet ( Chen et al, 2017 ). We speculated that the effects of N addition on SOC content in aggregate fractions at forest system might be similar to that of maize cropping systems utilizing organic residues, as both systems return a large amount of plant biomass to soil.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen addition increases the contents of glomalin-related soil protein and soil organic carbon but retains aggregate stability in a Pinus tabulaeformis forest

Sun

Jing

Wang

et al. 2018

PeerJ

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BackgroundGlomalin-related soil protein (GRSP) and soil organic carbon (SOC) contribute to the formation and stability of soil aggregates, but the mechanism by which global atmospheric nitrogen (N) deposition changes soil aggregate stability by altering the distribution of GRSP and SOC in different aggregate fractions remains unknown.MethodsWe used a gradient N addition (0–9 g N m−2 y−1) in Pinus tabulaeformis forest for two years in northeast China and then examined the changes in SOC contents, total GRSP (T-GRSP), and easily extractable GRSP (EE-GRSP) contents in three soil aggregate fractions (macro-aggregate: >250 μm, micro-aggregate: 250–53 μm, and fine material: <53 μm) and their relationship with aggregate stability.Results(1) The soil was dominated by macro-aggregates. Short term N addition had no significant effect on mean weight diameter (MWD) and geometric mean diameter (GMD). (2) GRSP varied among aggregate fractions, and N addition had different effects on the distribution of GRSP in aggregate fractions. The EE-GRSP content in the macro-aggregates increased initially and then decreased with increasing N addition levels, having a peak value of 0.480 mg g−1 at 6 g N m−2 y−1. The micro-aggregates had the lowest EE-GRSP content (0.148 mg g−1) at 6 g N m−2 y−1. Furthermore, the T-GRSP content significantly increased in the aggregate fractions with the N addition levels. (3) The macro-aggregate had the highest SOC content, followed by the micro-aggregate and the fine material had the lowest SOC content. N addition significantly increased the SOC content in all the aggregate fractions. (4) GRSP and SOC contents were not significantly correlated with MWD.ConclusionGlomalin-related soil protein and SOC contents increased by N addition, but this increase did not enhance aggregate stability in short term, and the improvement of stability might depend on binding agents and incubation time.

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“…To remove any carbonates (carbonates account for only 0.02% of the dry weight) from the samples, the HCl fumigation method described in Harris, Horwáth, and Kessel (2001) was used before analysis. Therefore, the total C content was equivalent to the organic C content (Chen et al, 2017b).…”

Section: Physicochemical Propertiesmentioning

confidence: 99%

“…Recent studies have focused on the effects of different vegetation types on SOM variability by analyzing lignin in the bulk soil and various soil fractions. However, there is a lack of comprehensive knowledge on the interactions among root extension, aggregates, residue composition, and microorganisms (Angst et al, 2017;Chen et al, 2017b;DeMarco, Filley, & Throop, 2016;Lin & Simpson, 2016;Panettieri, Rumpel, Dignac, & Chabbi, 2017). Spanning more than 200 yr, the distinct successional stages across pioneer broadleaf stands to stably mixed broadleaf-pine stands in the Changbai Mountains in northeastern China (Lou, Zheng, Sui, & Han, 2013;Zhang, Han, & Yu, 2006) provide a unique opportunity to obtain the mechanistic understanding of how vegetation change affects long-term C sequestration.…”

Section: Introductionmentioning

confidence: 99%

Variation in soil lignin protection mechanisms in five successional gradients of mixed broadleaf–pine forests

Feng

Han

Chen

et al. 2020

Soil Science Soc of Amer J

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Over 200 yr of ecosystem succession in northeastern China, conifers have replaced broadleaf trees. Vegetation changes during forest succession may affect soil organic C (SOC) stability, which is associated with altered protection mechanisms. Lignin phenol composition, a predictor of soil organic matter variation, was assessed for macroaggregates, microaggregates, and silt–clay (SC) fractions from successional gradients in five forests aged 19 to 239 yr in the Changbai Mountains nature reserve. The large macroaggregates (4.00–8.00 and 2.00–4.00 mm) comprised 45.17 to 59.87% of bulk dry weight and 40.22 to 60.89% of SOC in the 19‐, 32‐, and 48‐yr‐old pioneer forests. However, we detected increased mass proportions and SOC contents in small macroaggregates (1.00–2.00 and 0.25–1.00 mm) in the mixed broadleaf–Korean pine (Pinus koraiensis Siebold & Zucc.) forest after 122 yr. Lignin in bulk soil and aggregates in the 122‐yr‐old stand had lower acid/aldehyde ratios for the vanillyl and syringyl types than other stands, indicating less lignin decomposition. The highest C (198.20 g kg−1 soil) and lignin concentrations (6.14 mg 100 mg−1 C) were detected in the bulk soil from the 239‐yr‐old stand, where SC fraction occupied 56.18% of the C and 84.17% of the lignin content in bulk soil. Forest succession from broadleaf to a broadleaf–pine mixture shifted SOC sequestration and lignin protection from aggregates to SC fractions, along with the development of plant litter composition, fine‐root biomass and turnover, and microorganism biomass, which prompted effective long‐term SOC accumulation in successional forest communities.

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Addition of nitrogen enhances stability of soil organic matter in a temperate forest

Cited by 32 publications

References 40 publications

Soil quality indicators in an Andisol under different tree covers in disturbed Nothofagus forests

Soil quality indicators in an Andisol under different tree covers in disturbed Nothofagus forests

Nitrogen addition increases the contents of glomalin-related soil protein and soil organic carbon but retains aggregate stability in a Pinus tabulaeformis forest

Variation in soil lignin protection mechanisms in five successional gradients of mixed broadleaf–pine forests

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