Soil aggregate-associated organic carbon dynamics subjected to different types of land use: Evidence from 13C natural abundance

Liu, Yi; Liu, Wenzhi; Wu, Lianhai; Liu, Chuang; Wang, L.; Chen, Fang; Li, Zhiguo

doi:10.1016/j.ecoleng.2018.08.018

Cited by 47 publications

(16 citation statements)

References 32 publications

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“…In our study, the aggregate-model (F1 & F2) results indicated that increases in SOC stocks were mainly due to increases in SOC concentration rather than mass in macroaggregates and microaggregates (Fig 7 ), and could conclude that macroaggregate-OC stock is the main contributing factor to changes in total SOC stock. Previous studies obtained a similar results (Liu et al 2018b;Qiu et al 2015).…”

Section: Soc Source Analysis Based On Aggregates and Carbon Isotope In Topsoilsupporting

confidence: 79%

Isotope Analysis Reveals Differential Impacts of Artificial and Natural Afforestation On Soil Organic Carbon Dynamics in Abandoned Farmland

Huang

2021

Preprint

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Backgrounds A multitude of studies have applied different methods to study the dynamics of soil organic carbon (SOC), but the differential impact of artificial and natural afforestation on SOC dynamic are still poorly understood. Methods and aims We investigated the SOC dynamics following artificial and natural afforestation in Loess Plateau of China, characterizing soil structure and stoichiometry using stable isotope carbon and radiocarbon models. We aim to compare SOC dynamics, clarify SOC source under different afforestation, examine comparability of the study areas and find how soil aggregate size classes control SOC dynamics, finally to evaluate effect of reforestation project.Results The 0-10cm and 10-20 cm SOC stocks were significant higher than other two land-use system. At other depths, there is no significant difference among the three land-use system. Total top soil SOC stocks, C:N and C:P of differently sized soil aggregates significantly increased following afforestation. 13C results and Radiocarbon models indicated that the SOC decomposition rate and new SOC input rate were lower under natural afforestation than artificial afforestation. Conclusions Afforestation can accumulate SOC in top soils mainly resulting from in topsoil changing. SOC resource is mainly from macroaggregate formation provided by fresh plant residues. SOC loss from soil respiration was derived from microaggregates during afforestation. The“space-for-time substitution” method is suitable for comparability of the study areas.

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Section: Soc Source Analysis Based On Aggregates and Carbon Isotope In Topsoilsupporting

confidence: 79%

Isotope Analysis Reveals Differential Impacts of Artificial and Natural Afforestation On Soil Organic Carbon Dynamics in Abandoned Farmland

Huang

2021

Preprint

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“…1) that covers a surface area of approximately 840 km 2 was established in 1973 as one of the water resource areas for China's South-to-North Water Diversion Project. This region includes rocky mountainous and hilly areas and is characterized by a fragile ecological environment (Liu et al, 2018b). Economic and societal development in the area has resulted in deterioration of the ecosystems and water quality of some watershed tributaries and the reservoir area.…”

Section: Introductionmentioning

confidence: 99%

Soil C and N dynamics and hydrological processes in a maize-wheat rotation field subjected to different tillage and straw management practices

Wang

Yuan

Liu

et al. 2019

Agriculture, Ecosystems & Environment

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“…The C/N ratios for two sizes of aggregates in soil containing high levels of C saturation ranged from 6.33 to 10.38 (average of 4.05) and 7.38 to 9.99 (average of 2.61), whilst the ratios of the other two aggregate sizes were found to range from 5.64-7.93 (average of 2.29) and from 5.66-6.04 (average of 0.38). Therefore, SOC in macroaggregates is more liable to decompose and be transformed into micro aggregates [38], with SOC concentrations in aggregates with a size of >2mm increased from 15.24 g/kg for NPK to 25.46 g/kg for BC2 treatment, while the SOC content of aggregates with a size of 2-0.25mm was increased by 49.9%. Application of larger amounts of biochar led to the overall SOC concentration in macroaggregates being decreased; however, SOC was still relatively increased in aggregates with sizes of 0.25-0.106 mm and <0.106 mm [39].…”

Section: Discussionmentioning

confidence: 99%

Investigations of the effect of the amount of biochar on soil porosity and aggregation and crop yields on fertilized black soil in northern China

et al. 2020

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The combination of chemical fertilizer and biochar is regarded as a useful soil supplement for improving the properties of soil and crop yields, and this study describes how the biochar of maize straw can be used to improve the quality of the degraded black soil. This has been achieved by examining the effects of combining different amounts of biochar with chemical fertilizer on the porosities and aggregate formation of soil and exploring how these changes positively impact on crop yields. A field trial design combining different amounts of maize straw biochar [0 (NPK), 15.75 (BC1), 31.5 (BC2), and 47.25 t ha−1 (BC3)] with a chemical fertilizer (NPK) has been used to investigate changes in the formation of soil aggregate, clay content, soil organic carbon (SOC), and crop yields in Chinese black soil over a three year period from 2013 to 2015. The results of this study show that the addition of fertilizer and biochar in 2013 to black soil results in an increased soybean and maize yields from 2013 to 2015 for all the treatments, with BC1/BC2 affording improved crop yields in 2015, while BC3 gave a lower soybean yield in 2015. Total porosities and pore volumes were increased for BC1 and BC2 treatments but relatively decreased for BC3, which could be attributed to increased soil capillary caused by the presence of higher numbers of fine soil particles. The addition of biochar had a positive influence on the numbers and mean weight diameters (MWD) of soil macroaggregates (>0.25 mm) that were present, with the ratio of SOC to TN in soil macroaggregates found to be greater than in the microaggregates. The most significant amount of carbon present in macroaggregates (>2 mm and 0.25–2 mm) was observed when BC2 was applied as a soil additive. Increasing the levels of maze straw biochar to 47.25 t ha−1 led to an increase in the total organic carbon of soil, however, the overall amount of macroaggregates and MWD were decreased, which is possibly due to localized changes in microbial habitat. The supplementation of biochar increased in the amount of aromatic C present (most significant effect observed for BC2), with the ratio of aliphatic C to aromatic C found to be enhanced due to a relative reduction in the aliphatic C content with >2 mm particle fraction. These changes in organic carbon content and soil stability were analyzed using univariate quadratic equations to explain the relationship between the type of functional groups (polysaccharide C, aliphatic C, aromatic C, aliphatic C/aromatic C) present in the soil aggregates and their MWDs, which were found to vary significantly. Overall, the results of this study indicate that the use of controlled amounts of maize-straw biochar in black soil is beneficial for improving crop yields and levels of soil aggregation, however, the use of excessive amounts of biochar results in unfavorable aggregate formation which negatively impacts the yields of crop growth. The data produced suggest that aromatic C content can be used as a single independent variable to characterize the stability of soil aggregate when biochar/fertilizer mixtures are used as soil additives to boost growth yields. Analysis of soil and crop performance in black soil revealed that the application of maize-straw biochar at a rate of 15.75 and 31.5 t ha−1 had positive effects on crop yields, soil aggregation and accumulation of aromatic C in the aggregate fractions when a soybean-maize rotation system was followed over three years.

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Soil aggregate-associated organic carbon dynamics subjected to different types of land use: Evidence from 13C natural abundance

Cited by 47 publications

References 32 publications

Isotope Analysis Reveals Differential Impacts of Artificial and Natural Afforestation On Soil Organic Carbon Dynamics in Abandoned Farmland

Isotope Analysis Reveals Differential Impacts of Artificial and Natural Afforestation On Soil Organic Carbon Dynamics in Abandoned Farmland

Soil C and N dynamics and hydrological processes in a maize-wheat rotation field subjected to different tillage and straw management practices

Investigations of the effect of the amount of biochar on soil porosity and aggregation and crop yields on fertilized black soil in northern China

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