Temporal dynamics and vertical distribution of newly-derived carbon from a C3/C4 conversion in an Ultisol after 30-yr fertilization

Liu, S.; Zhang, Z.B.; Li, D.M.; Hallett, Paul D.; Zhang, G.L.; Peng, Xinhua

doi:10.1016/j.geoderma.2018.11.021

Cited by 17 publications

(12 citation statements)

References 46 publications

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“…In the topsoil of Qilihai and Beidagang, C 4 plant contributed 32–48% to the bulk SOC in cropland, which is in agreement with other studies (Cheng, Luo, Xu, Sherry, & Zhang, ; Zhang et al, ). The contribution of C 4 crop‐derived C to SOC in the subsoil was lower than that in topsoil, which is also reasonable (e.g., Liu et al, ; Zang et al, ). In the present study, there was no difference in the contribution of C 4 plant‐derived C to SOC among the aggregate sizes.…”

Section: Discussionsupporting

confidence: 67%

Conversion of coastal marshes to croplands decreases organic carbon but increases inorganic carbon in saline soils

et al. 2020

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Over the past century, conversion to agriculture has greatly reduced the global extent of coastal wetlands leading to degradation and loss of these ecosystems.However, it remains unclear how this land conversion affects the confluent soil organic and inorganic carbon (SOC and SIC) storage as well as their localizations in soil matrix. Here, we investigated these issues using wet sieving at two coastal saline-alkali sites in northern China. Conversion of marshes to cropland (>60 years) decreased the portion of large macroaggregates (>2 mm) and correspondingly increased the portion of microaggregates (0.053-0.25 mm) at both sites. Land conversion decreased SOC contents by 31-67% in all fractions (>2, 0.25-2, 0.053-0.25, and <0.053 mm) in the topsoil (0-15 cm) and subsoil (15-30 cm). In contrast, irrigation-and NH 4 HCO 3 fertilization-derived carbonates increased SIC storages in almost all fractions due to the saline-alkali soil conditions, especially for the subsoil.This increases in SIC almost offset and compensate for the SOC losses at both sites.Consequently, the irrigation-and NH 4 HCO 3 -induced SIC accumulation should be included in the full C balance of saline-alkali soils. It should be noted, however, that the progressive loss of SOC due to cultivation will lead to soil degradation in fertility and ecological function, thereby hampering long-term sustainability of coastal ecosystems. Therefore, the compensation of SIC for the loss of SOC is not sustainable in the longer term.

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Section: Discussionsupporting

confidence: 67%

Conversion of coastal marshes to croplands decreases organic carbon but increases inorganic carbon in saline soils

et al. 2020

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“…Forest ecosystems significantly contribute to global organic carbon (OC) sequestration [1,2], storing 80% of the aboveground OC pool and 40% of the soil organic carbon (SOC) pool [3,4]. In the case of forests, a very high heterogeneity of the OC stock was noted, which was explained via both abiotic factors-such as topographic effects [5][6][7][8][9], morphogenetic processes [10], and soil properties [11][12][13][14]-and biotic factors-such as the tree species composition [15][16][17][18][19][20], silviculture treatment [10,12] and stand age [21,22]. The quantification of the OC pool in forests that cover large areas of land is important not only from a research point of view but more importantly in the context of expected changes due to climate change and deforestation observed all over the world [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Biotic and Abiotic Determinants of Soil Organic Matter Stock and Fine Root Biomass in Mountain Area Temperate Forests—Examples from Cambisols under European Beech, Norway Spruce, and Silver Fir (Carpathians, Central Europe)

Zielonka

Drewnik

Musielok

et al. 2021

Forests

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Forest ecosystems significantly contribute to the global organic carbon (OC) pool, exhibiting high spatial heterogeneity in this respect. Some of the components of the OC pool in a forest (woody aboveground biomass (wAGB), coarse root biomass (CRB)) can be relatively easily estimated using readily available data from land observation and forest inventories, while some of the components of the OC pool are very difficult to determine (fine root biomass (FRB) and soil organic matter (SOM) stock). The main objectives of our study were to: (1) estimate the SOM stock; (2) estimate FRB; and (3) assess the relationship between both biotic (wAGB, forest age, foliage, stand density) and abiotic factors (climatic conditions, relief, soil properties) and SOM stocks and FRB in temperate forests in the Western Carpathians consisting of European beech, Norway spruce, and silver fir (32 forest inventory plots in total). We uncovered the highest wAGB in beech forests and highest SOM stocks under beech forest. FRB was the highest under fir forest. We noted a considerable impact of stand density on SOM stocks, particularly in beech and spruce forests. FRB content was mostly impacted by stand density only in beech forests without any discernible effects on other forest characteristics. We discovered significant impacts of relief-dependent factors and SOM stocks at all the studied sites. Our biomass and carbon models informed by more detailed environmental data led to reduce the uncertainty in over- and underestimation in Cambisols under beech, spruce, and fir forests for mountain temperate forest carbon pools.

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“…The changed microbial properties might further affect exogenous C mineralization and C sequestration. Field researches showed N addition could significantly regulate SOC balance mainly through indirect effects on vegetation C input (Liu et al, 2019). However, the direct impact of N addition on new C sequestration was unclear.…”

Section: Introductionmentioning

confidence: 99%

Higher carbon sequestration potential and stability for deep soil compared to surface soil regardless of nitrogen addition in a subtropical forest

Liao

Dong

Huang

et al. 2020

PeerJ

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Background Labile carbon input could stimulate soil organic carbon (SOC) mineralization through priming effect, resulting in soil carbon (C) loss. Meanwhile, labile C could also be transformed by microorganisms in soil as the processes of new C sequestration and stabilization. Previous studies showed the magnitude of priming effect could be affected by soil depth and nitrogen (N). However, it remains unknown how the soil depth and N availability affect the amount and stability of the new sequestrated C, which complicates the prediction of C dynamics. Methods A 20-day incubation experiment was conducted by adding 13C labeled glucose and NH4NO3 to study the effects of soil depth and nitrogen addition on the net C sequestration. SOC was fractioned into seven fractions and grouped into three functional C pools to assess the stabilization of the new sequestrated C. Results Our results showed that glucose addition caused positive priming in both soil depths, and N addition significantly reduced the priming effect. After 20 days of incubation, deep soil had a higher C sequestration potential (48% glucose-C) than surface soil (43% glucose-C). The C sequestration potential was not affected by N addition in both soil depths. Positive net C sequestration was observed with higher amount of retained glucose-C than that of stimulated mineralized SOC for both soil depths. The distribution of new sequestrated C in the seven fractions was significantly affected by soil depth, but not N addition. Compared to deep soil, the new C in surface soil was more distributed in the non-protected C pool (including water extracted organic C, light fraction and sand fraction) and less distributed in the clay fraction. These results suggested that the new C in deep soil was more stable than that in surface soil. Compared to the native SOC for both soil depths, the new sequestrated C was more distributed in non-protected C pool and less distributed in biochemically protected C pool (non-hydrolyzable silt and clay fractions). The higher carbon sequestration potential and stability in deep soil suggested that deep soil has a greater role on C sequestration in forest ecosystems.

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Temporal dynamics and vertical distribution of newly-derived carbon from a C3/C4 conversion in an Ultisol after 30-yr fertilization

Cited by 17 publications

References 46 publications

Conversion of coastal marshes to croplands decreases organic carbon but increases inorganic carbon in saline soils

Conversion of coastal marshes to croplands decreases organic carbon but increases inorganic carbon in saline soils

Biotic and Abiotic Determinants of Soil Organic Matter Stock and Fine Root Biomass in Mountain Area Temperate Forests—Examples from Cambisols under European Beech, Norway Spruce, and Silver Fir (Carpathians, Central Europe)

Higher carbon sequestration potential and stability for deep soil compared to surface soil regardless of nitrogen addition in a subtropical forest

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