Responses of Soil Active Organic Carbon Fractions and Enzyme Activities to Freeze-thaw Cycles in Wetlands

Guan, Jinqiu; Song, Chunxiang; Wu, Yifei; Qi, Xingtian; Qu, Rongjun; Li, Fu; Ni, Hongwei

doi:10.1007/s13157-022-01553-7

Cited by 4 publications

(3 citation statements)

References 50 publications

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“…The higher the particulate organic carbon, the higher the unstable part of soil organic carbon. Due to differences in plant communities, root distribution, water status, pH value, and SOC, the distribution of MBC, DOC and POC in soil layers was also different, which was consistent with the results of Guan and Sainepo [ 10 , 44 ]. The SWC of the TR community is low, soil litter input is relatively less, SOC is easy to oxidized, and microbial growth and reproduction are inhibited, with relatively few types and quantities.…”

Section: Discussionsupporting

confidence: 89%

“…Marsh hydrology is the main driving force that maintains the development and decline of wetlands [ 9 ]. Soil active organic carbon refers to the part of soil organic carbon that transfers quickly in soil, has unstable chemical properties, is easily oxidized, decomposed, and mineralized, and its morphology and spatial location have a high impact on the activities of plants and microorganisms [ 10 ]. Soil active organic carbon refers to the unstable part of the soil that is fast-moving, has poor stability, easy to oxidation, is easy to mineralization, and is highly active to plants and soil microorganisms [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of soil organic carbon fractions in four vegetation communities of an inland salt marsh

Kang,

Zhao,

et al. 2024

Carbon Balance Manage

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Background The study of soil organic carbon characteristics and its relationship with soil environment and vegetation types is of great significance to the evaluation of soil carbon sink provided by inland salt marshes. This paper reports the characteristics of soil organic carbon fractions in 0–50 cm soil layers at four vegetation communities of the Qinwangchuan salt marsh. Results (1) The soil organic carbon content of Phragmites australis community (9.60 ± 0.32 g/kg) was found to be higher than that of Salicornia europae (7.75 ± 0.18 g/kg) and Tamarix ramosissima (4.96 ± 0.18 g/kg) and Suaeda corniculata community (4.55 ± 0.11 g/kg). (2) The soil dissolved organic carbon, particulate organic carbon and soil microbial biomass carbon in 0–50 cm soil layer of Phragmites australis community were higher, which were 0.46 ± 0.01 g/kg, 2.81 ± 0.06 g/kg and 0.31 ± 0.01 g/kg, respectively. (3) Soil organic carbon was positively correlated with dissolved organic carbon, particulate organic carbon, and microbial biomass carbon, and negatively correlated with easily oxidized organic carbon. (4) Above-ground biomass has a strong direct positive effect on soil organic carbon, total nitrogen and pH have a strong direct positive effect on microbial biomass carbon content, pH and average density have a strong direct negative effect on easily oxidized organic carbon, and particulate organic carbon. Conclusions The interaction between plant community characteristics and soil factors is an important driving factor for soil organic carbon accumulation in inland salt marshes.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Characteristics of soil organic carbon fractions in four vegetation communities of an inland salt marsh

Kang,

Zhao,

et al. 2024

Carbon Balance Manage

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“…Because the sources of soil active organic carbon are microorganisms, which are active in crop residues, the increased microbial metabolic functions and secretions are important reasons for the increased carbon fractions being more easily decomposed during the conversion of original desert into oasis farmlands (Rovira and Vallejo, 2002). Compared to carbon, which is difficult to decompose, active organic carbon has a higher turnover rate and is more sensitive to soil physicochemical properties (e.g., pH and SWC), suggesting that the oasification process by which original desert is conversion to oasis farmlands increases SOC but also risks carbon loss (Benbi et al, 2015;Guan et al, 2022). It is noteworthy that in surface soils, although C NL accounts for a relatively low proportion of the total SOC (Fig.…”

Section: Effect Of Oasification On Socmentioning

confidence: 99%

Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land

2023

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Soil organic carbon (SOC) and its stable isotope composition reflect key information about the carbon cycle in ecosystems. Studies of carbon fractions in oasis continuous cotton-cropped fields can elucidate the SOC stability mechanism under the action of the human-land relationship during the oasification of arid land, which is critical for understanding the carbon dynamics of terrestrial ecosystems in arid lands under global climate change. In this study, we investigated the Alar Reclamation Area on the northern edge of the Tarim Basin, Xinjiang Uygur Autonomous Region of China, in 2020. In original desert and oasis farmlands with different reclamation years, including 6, 10, 18, and 30 a, and different soil depths (0-20, 20-40, 40-60 cm), we analyzed the variations in SOC, very liable carbon (CVL), liable carbon (CL), less liable carbon (CLL), and non-liable carbon (CNL) using the method of spatial series. The differences in the stable carbon isotope ratio (δ 13 C) and beta (β) values reflecting the organic carbon decomposition rate were also determined during oasification. Through redundancy analysis, we derived and discussed the relationships among SOC, carbon fractions, δ 13 C, and other soil physicochemical properties, such as the soil water content (SWC), bulk density (BD), pH, total salt (TS), total nitrogen (TN), available phosphorus (AP), and available potassium (AK). The results showed that there were significant differences in SOC and carbon fractions of oasis farmlands with different reclamation years, and the highest SOC was observed at the oasis farmland with 30-a reclamation year. CVL, CL, CLL, and CNL showed significant changes among oasis farmlands with different reclamation years, and CVL had the largest variation range (0.40-4.92 g/kg) and accounted for the largest proportion in the organic carbon pool. The proportion of CNL in the organic carbon pool of the topsoil (0-20 cm) gradually increased. δ 13 C varied from -25.61‰ to -22.58‰, with the topsoil showing the most positive value at the oasis farmland with 10-a reclamation year; while the β value was the lowest at the oasis farmland with 6-a reclamation year and then increased significantly. Based on the redundancy analysis results, the soil physicochemical properties, such as TN, AP, AK, and pH, were significantly correlated with CL, and TN and AP were positively correlated with CVL. However, δ 13 C was not significantly influenced by soil physicochemical properties. Our analysis advances the understanding of SOC dynamics during oasification, revealing the risk of soil carbon loss and its contribution to terrestrial carbon accumulation in arid lands, which could be useful for the sustainable development of regional carbon resources and ecological protection in arid ecosystem.

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Effects of different restoration methods on soil organic carbon and its fractions of cut slopes in mountainous areas of southwestern China

Ai,

Yang,

et al. 2024

J Soils Sediments

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Responses of Soil Active Organic Carbon Fractions and Enzyme Activities to Freeze-thaw Cycles in Wetlands

Cited by 4 publications

References 50 publications

Characteristics of soil organic carbon fractions in four vegetation communities of an inland salt marsh

Characteristics of soil organic carbon fractions in four vegetation communities of an inland salt marsh

Reclamation during oasification is conducive to the accumulation of the soil organic carbon pool in arid land

Effects of different restoration methods on soil organic carbon and its fractions of cut slopes in mountainous areas of southwestern China

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