Conservation tillage for 17 years alters the molecular composition of organic matter in soil profile

Gao, Qiqi; Ma, Lixiao; Fang, Yunying; Zhang, Aiping; Li, Guichun; Wang, Junjian; Wu, Di; Wu, Wenliang; Du, Zhangliu

doi:10.1016/j.scitotenv.2020.143116

Cited by 28 publications

(16 citation statements)

References 43 publications

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“…The remaining residues after DCM/MeOH extraction were air-dried and then oxidized with CuO to obtain lignin-derived phenols (Otto et al, 2005;Otto & Simpson, 2006). The detailed process was described by Gao et al (2020).…”

Section: Laboratory Measurementsmentioning

confidence: 99%

“…The important SOM component is SOC (including labile organic carbon [LOC], DOC, particulate organic carbon [POC], and other fractions; Wang et al, 2020). However, SOC fractions differ from SOM in molecular structure, whereby molecular structure of SOM includes long-chain aliphatics (n-alkanes, n-alkanols, and n-alkanolic acids) and steroids from higher plants, as well as short-chain aliphatics and trehalose derived from microbes (Gao et al, 2020;Otto et al, 2005). Biomarkers (such as free and bound lipids, lignin-derived phenols) are widely used to identify molecular composition of SOM (Gao et al, 2020;Otto & Simpson, 2007;Wang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…However, SOC fractions differ from SOM in molecular structure, whereby molecular structure of SOM includes long-chain aliphatics (n-alkanes, n-alkanols, and n-alkanolic acids) and steroids from higher plants, as well as short-chain aliphatics and trehalose derived from microbes (Gao et al, 2020;Otto et al, 2005). Biomarkers (such as free and bound lipids, lignin-derived phenols) are widely used to identify molecular composition of SOM (Gao et al, 2020;Otto & Simpson, 2007;Wang et al, 2019). These biomarkers are extracted in various ways (including solvent extraction, alkaline hydrolysis, CuO oxidation, etc.)…”

Section: Introductionmentioning

confidence: 99%

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Long‐term biochar application governs the molecular compositions and decomposition of organic matter in paddy soil

Sun

Zhang

et al. 2021

GCB Bioenergy

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Section: Laboratory Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long‐term biochar application governs the molecular compositions and decomposition of organic matter in paddy soil

Sun

Zhang

et al. 2021

GCB Bioenergy

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“…Ono et al ( 2011 ) reported that the highest proportion of organic C in plant litter, the forest floors, and the forest soils was observed in the O-alkyl groups and the decomposability of C was in the order of O-alkyl C > alkyl C > aromatic C > carbonyl C. O-alkyl groups influence the soil physical conditions, cation exchange reaction, anion retention, and biological activities (Haynes et al 1991 ; Lima et al 2009 ). It is considered that labile SOC decreases, while the stable SOC increases with soil depth (Soucémarianadin et al 2018 ) and it has been observed that the proportions of O-alkyl groups decrease with soil depth, while the alkyl, carbonyl, and aromatic groups increase with increasing depth in the soil profile (Gao et al 2021 ; Ussiri and Johnson 2003 ; Zhang et al 2015 ). Although an increase in O-alkyl C content can be indicative of an accumulation of labile organic C (He et al 2018 ), the positive correlation which is often observed between O-alkyl C conversion rate and soil clay content are likely explained by the underlying mechanism: clay enhances aggregate formation that reduces the organic C accessible to microbial decay (Kölbl and Kögel-Knabner 2004 ), thus stabilizing SOC.…”

Section: Introductionmentioning

confidence: 99%

The effect of agroecosystem management on the distribution of C functional groups in soil organic matter: A review

et al. 2021

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To improve soil health and to aid in climate change mitigation, the quantity of soil organic matter (SOM) should be maintained or increased over the long run. In doing so, not only the total quantity of SOC but also the stability of SOC must be considered. Stability of SOC increases as a function of resistance to microbial decomposition or microbial substrate use efficiency through chemical, biological, and physical mechanisms including humification, hydrophobic moieties, molecular diversity, and formation of macroaggregates. One of the mechanisms that enhance stability confers changes in the distribution of C functional groups of SOM. To better understand and quantify how these changes are influenced by agricultural management practices, we collected 670 pairwise data from the body of literature that has evaluated changes in the distribution of C functional groups of SOM measured by solid-state 13C NMR spectroscopy. The types of agricultural managements discussed herein include (1) fertilization, (2) tillage, (3) crop rotation, (4) grazing, and (5) liming practices. Our meta-analyses show that these practices modify the distribution of C functional groups of SOM. Fertilization practices were associated with increased O-alkyl groups. Tillage resulted in increases in the SOC consisted of aromatic and carbonyl groups. Crop rotations, especially legume-based rotations, were found to increase the proportion of aromatic groups. Although there are fewer publications on tillage and crop rotation than on fertilization practices, the distribution of C functional groups may be more influenced by crop rotation and tillage practices than fertilization management—and should be a focus of future research.

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“…Wang et al, 2019;Wolff et al, 2018). Terracidiphilus, Acidibacter, Flavobacterium, and Lysobacter are involved in the degradation of plant-derived biopolymers (Garcia-Fraile et al, 2016), organic substrates (Ai et al, 2018), labile carbon (Nan et al, 2020), and macromolecules (Maarastawi et al, 2018), and large C-based materials from mulched straw increased their relative abundances. Although little is known about the ecology of Pseudolabrys, its relative abundance was increased in soil after compost application (Joa et al, 2014).…”

Section: Straw Mulching Altered Soil Bacterial Abundance and Communities With Soil Depthmentioning

confidence: 99%

Changes in soil physicochemical properties and bacterial communities at different soil depths after long-term straw mulching under a no-till system

Zhou

Chen

et al. 2021

SOIL

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Abstract. Conservation tillage has attracted increasing attention over recent decades, mainly due to its benefits for improving soil organic matter content and reducing soil erosion. However, the effects of long-term straw mulching under a no-till system on soil physicochemical properties and bacterial communities at different soil depths are still unclear. In this 12-year experiment of straw removal (CK) and straw mulching (SM) treatments, soil samples were collected at 0–5, 5–10, 10–20, and 20–30 cm soil depths. The results showed that the contents of organic carbon (C), nitrogen (N), and phosphorus (P) fractions, and bacterial abundance significantly decreased, whereas pH significantly increased with soil depth. Compared with CK, SM significantly increased total N, inorganic N, available P, available potassium, and soil water content at 0–5 cm, total organic C content at 0–10 cm, and dissolved organic C and N contents at 0–20 cm. Regarding bacterial communities, SM increased the relative abundances of Proteobacteria, Bacteroidetes, and Acidobacteria but reduced those of Actinobacteria, Chloroflexi, and Cyanobacteria. Bacterial Shannon diversity and Shannon's evenness at 0–5 cm were reduced by SM treatment compared to CK treatment. Furthermore, SM increased the relative abundances of some C-cycling genera (such as Terracidiphilus and Acidibacter) and N-cycling genera (such as Rhodanobacter, Rhizomicrobium, Dokdonella, Reyranella, and Luteimonas) at 0–5 cm. Principal coordinate analysis showed that the largest difference in the composition of soil bacterial communities between CK and SM occurred at 0–5 cm. Soil pH and N and organic C fractions were the major drivers shaping soil bacterial communities. Overall, SM treatment is highly recommended under a no-till system because of its benefits to soil fertility and bacterial abundance.

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Conservation tillage for 17 years alters the molecular composition of organic matter in soil profile

Cited by 28 publications

References 43 publications

Long‐term biochar application governs the molecular compositions and decomposition of organic matter in paddy soil

Long‐term biochar application governs the molecular compositions and decomposition of organic matter in paddy soil

The effect of agroecosystem management on the distribution of C functional groups in soil organic matter: A review

Changes in soil physicochemical properties and bacterial communities at different soil depths after long-term straw mulching under a no-till system

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