Carbon and nitrogen dynamics in soil organic matter fractions following eucalypt afforestation in southern Brazilian grasslands (Pampas)

Santos, Rafael S.; Oliveira, Fernanda Cristina Caparelli de; Ferreira, Gabriel W.D.; Ferreira, Matheus A.; Araújo, Elias Frank de; Silva, Ivo Ribeiro da

doi:10.1016/j.agee.2020.106979

Cited by 18 publications

(5 citation statements)

References 58 publications

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“…The C:N ratio of the soil in this region was 0.06 ~ 0.26, which was lower than the national C:N ratio of 11.3(Gren, 2008) under different treatments in our study which indicated that soil C contents were more de cient than N in this region. The soil C:N ratio and organic matter decomposition rate are inversely related, and lower soil C content indicates higher organic matter decomposition and mineralization rate, indicating that soil C was more de cient than N in this region (Santos et al, 2020). Secondly, this area's soil C:N uctuates rather steadily with soil depth under various treatments, suggesting that water has less of an impact on this region's soil C:N; Soil C:P was a symbol to balance the mineralization, release, absorption, and xation of phosphorus in organic matter, and a form to re ect the availability of phosphorus, which was of great signi cance to the study of soil physical and chemical properties (Poblete Grant et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Effects of Film Mulching and Irrigation on Biomass of Leaves, Roots and Tubers and Soil Nutrient Characteristics of Cyperus esculentus L.

Ding

Zhang²,

Li³

et al. 2022

Preprint

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Aims To study the effect of drip irrigation mulching and the most suitable irrigation system for Cyperus esculentus L., and to provide a reference for the construction of a cultivation model for water-saving and high yield management of Cyperus esculentus. Methods To study the effects of irrigation and mulching control on the nutrients and biomass of Cyperus esculentus, a combination of field and indoor experiments analyzed the film mulching (FM) and no film mulching (NFM) treatments and different irrigation treatments, CK (control, the common local irrigation of 5316.45 m3·ha-2), T1 (3431.40 m3·ha-2) and T2 (4133.85 m3·ha-2), and the correlation between soil and plant nutrient content and biomass. Results The result showed that contents of soil organ carbon (SOC), soil total nitrogen (STN), and soil total phosphorus (STP) dropped layer by layer with soil depth increased, and film mulching reduced SOC, STN, and STP contents, and reaching maximum under the T2NFM treatment. T2NFM treatment significantly increased leaf total phosphorus (LTP) and root total nitrogen (RTN). The aboveground and underground biomass reached maximum under the T2FM treatment, followed by higher biomass under FM than the NFM treatment. According to correlation analysis that the biomass of Cyperus esculentus, soil and plant nutrient contents, and yield could be improved by changing the water and fertilizer supply. Conclusion In conclusion, the region's soils are generally nitrogen-limited, therefore supplemental nitrogen fertilization is recommended for agricultural production. In addition, the irrigation of 4133.85 m3·ha-2 under the mulching condition not only improved yield but also saved water resources.

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Section: Discussionmentioning

confidence: 99%

Effects of Film Mulching and Irrigation on Biomass of Leaves, Roots and Tubers and Soil Nutrient Characteristics of Cyperus esculentus L.

Ding

Zhang²,

Li³

et al. 2022

Preprint

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“…Although it was widely believed that the OM concentration distribution in soil aggregates impacted the BCD distribution (Xu et al, 2021;Yang et al, 2018), this relationship between BCD and OM concentration seemed unlikely in this research. As C and N are structure elements of OM, the changes of soil OC and TN are capable of reflecting the variation in OM (Santos et al, 2020). Soil C:N ratio is a vital indicator and denotes the OM availability (Martins et al, 2011).…”

Section: Bacterial Community Composition Of Soil Aggregatesmentioning

confidence: 99%

Soil bacterial community structure as affected by stand age in Chinese fir plantations: Insights at the aggregate scale

Liao

Wang

2022

Land Degrad Dev

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Exploring the variations of soil bacterial communities can contribute to the sustainability of Chinese fir plantations (CFPs). As the living environments of soil bacteria, soil aggregates significantly affect the diversity and composition regarding soil bacterial communities in CFPs. However, the distribution characteristics exhibited by soil bacteria at the aggregate scale are still not clear. In the present research, the diversity and composition regarding soil bacterial communities (using high-flux sequencing) in CFPs with diverse stand ages (3, 9, 17, and 26 years) were analyzed from the perspective of soil aggregates (>2, 1-2, 0.25-1, <0.25 mm) in Guangxi, China. According to the results, regardless of the aggregate size and the stand age, bacterial communities in soil were mainly composed of Proteobacteria, Chloroflexi, and Acidobacteria. During Chinese fir growth, the relative abundance (RA) of soil Proteobacteria first elevated and afterwards reduced, with the greatest level in the 17 years, while that of soil Chloroflexi exhibited an inverse trend. In addition, the RA of soil Acidobacteria increased over time. At the aggregate scale, the 17-year-old CFPs presented the greatest soil bacterial community diversity (based on the Chao 1 and Shannon indices). After 17 years, the destruction of coarse macroaggregates (>2 mm) could induce the reduction of soil bacterial community diversity, as coarse macroaggregates, taking up the majority of bulk soil, offered suitable environments for soil bacteria to survive and thrive. Moreover, soil organic C and total N concentrations and soil pH also significantly affected the diversity and composition regarding soil bacterial communities over time. Hence, the conservation of coarse macroaggregates after 17 years of Chinese fir growth is important to sustain the soil health as well as the bacterial community diversity in Guangxi, China.

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“…19 The introduction of temporary grasslands as part of crop rotations dominated by annual crops can enhance biodiversity 20,21 and carbon sequestration into soils, thereby improving soil structure and fertility, as well as water storage capacity. [22][23][24][25][26] It can also reduce nitrogen (N) and phosphorus (P) losses, mitigating eutrophication in aquatic ecosystems 27 and reducing fertilizer use with associated reductions in greenhouse gas (GHG) emissions. 26,[28][29][30] Mixed grass and clover cultivation produces good yields with a relatively low demand for synthetic N-containing fertilizers owing to clover's biological capacity for nitrogen fixation.…”

mentioning

confidence: 99%

“…[22][23][24][25][26] It can also reduce nitrogen (N) and phosphorus (P) losses, mitigating eutrophication in aquatic ecosystems 27 and reducing fertilizer use with associated reductions in greenhouse gas (GHG) emissions. 26,[28][29][30] Mixed grass and clover cultivation produces good yields with a relatively low demand for synthetic N-containing fertilizers owing to clover's biological capacity for nitrogen fixation. Besides biogas, anaerobic digestion of the harvested biomass produces N-rich digestates that can substitute for mineral fertilizers, enhancing GHG savings.…”

mentioning

confidence: 99%

Towards multifunctional landscapes coupling low carbon feed and bioenergy production with restorative agriculture: Economic deployment potential of grass‐based biorefineries

Balaman

Berndes

Cederberg

et al. 2022

Biofuels Bioprod Bioref

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Grass-based biomass from grasslands can be used as feedstock in green biorefineries (GBs) that produce a range of biobased products. In addition, adjustments made as part of crop rotation to increase areas under temporary grasslands can yield benefits such as carbon sequestration, increased soil productivity, reduced eutrophication and reduced need for pesticides. In this paper, a flexible modeling framework is developed to analyze the deployment options for GBs that use grass-clover to produce protein feed and feedstock for bioenergy. The focus is placed on optimal deployment, considering system configuration and operation, as well as land use changes designed to increase grass-clover cultivation on cropland. A case study involving 17 counties in Sweden showed that the deployment of GB systems could support biomethane and protein feed production corresponding to 5-60 and 13-154%, respectively, of biomethane and soybean feed imports to Sweden in 2020.

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Carbon and nitrogen dynamics in soil organic matter fractions following eucalypt afforestation in southern Brazilian grasslands (Pampas)

Cited by 18 publications

References 58 publications

Effects of Film Mulching and Irrigation on Biomass of Leaves, Roots and Tubers and Soil Nutrient Characteristics of Cyperus esculentus L.

Effects of Film Mulching and Irrigation on Biomass of Leaves, Roots and Tubers and Soil Nutrient Characteristics of Cyperus esculentus L.

Soil bacterial community structure as affected by stand age in Chinese fir plantations: Insights at the aggregate scale

Towards multifunctional landscapes coupling low carbon feed and bioenergy production with restorative agriculture: Economic deployment potential of grass‐based biorefineries

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