Copper content in soils and litter from fruit orchards in Central Chile and its relationship with soil microbial activity

Schoffer, J. Tomás; Aponte, Humberto; Neaman, Alexander; Fuente, Luz María de la; Arellano, Eduardo C.; Gil, Pilar M.; Ginocchio, Rosanna

doi:10.17221/281/2021-pse

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…Notably, only the total soil Cu concentration exhibited a wide range of variation (up to 24× higher). However, the soil soluble Cu content exhibited a negligible variation (less than 1×), with a mean value of 0.16 mg kg − 1 , which is the same value obtained in a previous study by Schoffer et al 2022 that was conducted in the same region. As discussed previously, the topsoil in the study region is in uenced by Cu-mining activity, as indicated by the polymetallic (Cu, Zn, As, and Pb) pollution detected in the soil, which is in agreement with corresponding literature related to the study area 26 .…”

Section: Resultssupporting

confidence: 87%

Evaluation of Cu-toxicity in agricultural topsoil contaminated by different sources in central Chile

Schoffer,

Aponte,

Neaman

et al. 2024

Preprint

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The primary fruit production zone in Chile lies in the lowland areas of the central region, which has a history of soil copper pollution due to both copper mining (in the highlands) and the use of copper-based pesticides in agriculture. This study assessed the phytotoxic effect of copper in agricultural topsoil contaminated by different sources in the region. A total of 13 agricultural sites, including polluted soils and a background unpolluted soil, were sampled, and a toxicity bioassay was conducted using Lolium perenne. Multiple linear regression models revealed that copper has a significant negative impact on plant growth, whereas soluble zinc, organic matter, available nitrogen, and clay have positive effects and mitigate copper toxicity (p < 0.001). The effective concentration at 50% (EC50) of the total soil copper was 1030 mg kg− 1 for shoot length and 1084 mg kg− 1 for shoot dry mass. These results correspond with the EC50 values reported in previous studies that also used real-world contaminated soils. Moreover, the findings are noteworthy as only six studies have estimated copper toxicity thresholds for plants grown in contaminated soils. Overall, the results highlight the complex nature of copper toxicity in plants grown in soils contaminated by different sources and underscore the importance of considering multiple factors when assessing the impact of contaminants on plant growth in soils contaminated by various metals besides copper.

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Section: Resultssupporting

confidence: 87%

Evaluation of Cu-toxicity in agricultural topsoil contaminated by different sources in central Chile

Schoffer,

Aponte,

Neaman

et al. 2024

Preprint

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“…The highest enzyme activity and AWCD in the root zone can be associated with a high microbial biomass and organic matter, as well as lower Cu content as shown by relationships between CFUs, enzyme activities (except for AA), and total and available Cu contents (Figure 3). The positive effect of organic matter (slightly higher in the root zone) on soil biological activity has been widely described [64] even in metal contaminated soils [65]. In this context, organic matter serves as a substrate for heterotrophic microorganisms [66] and facilitates the creation of enzyme-humus complexes that mitigate the proteolytic and thermal degradation of extracellular enzymes (e.g., Pacid and UA) [67].…”

Section: Discussionmentioning

confidence: 99%

Biochemical, Catabolic, and PGP Activity of Microbial Communities and Bacterial Strains from the Root Zone of Baccharis linearis in a Mediterranean Mine Tailing

Aponte,

Sulbaran-Bracho,

Mondaca

et al. 2023

Microorganisms

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The management of mine tailings (MT) is commonly workload heavy, intrusive, and expensive. Phytostabilization offers a promising approach for MT management; however, it poses challenges due to the unfavorable physicochemical properties of these wastes. Nevertheless, native microorganisms capable of supporting plant growth and development could enhance the efficacy of phytostabilization. This study assesses the biological activity of microbial communities from the root zone of Baccharis linearis, which is naturally present in MT, in order to evaluate their biotechnological potential for phytostabilization. The root zone and bulk samples were collected from B. linearis plants located within a MT in the Mediterranean zone of Chile. Enzyme activities related to the cycling of C, N, and P were assessed. The community-level physiological profile was evaluated using the MicroRespTM system. Bacterial plant growth-promoting (PGP) traits and colony forming units (CFU) were evaluated through qualitative and microbiological methods, respectively. CFU, enzyme activities, and CLPP were higher in the root zone compared with the bulk samples. Five bacterial strains from the root zone exhibited PGP traits such as P solubilization and N acquisition, among others. The presence of microbial communities in the root zone of B. linearis with PGP traits suggests their potential to enhance the ecological management of MT through phytostabilization programs.

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“…Unfortunately, the plant litter from this experimental site was not analysed. However, evidence from the literature has shown that, generally, the plant litter from orchards receiving Cu sprays have a higher Cu concentration than the soils [35][36][37]. For example, Schoffer et al [36] reported that the leaf litter total Cu content from different fruit orchard farms receiving Cu-based fungicide sprays in Chile was 3-7 times higher than the total soil Cu.…”

Section: Influence Of Different Soil Properties On Soil Cu Concentrat...mentioning

confidence: 99%

The Potential Impact of Long-Term Copper Fungicide Sprays on Soil Health in Avocado Orchards

Matse,

Geretharan,

van Gorp

et al. 2024

Environments

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The long-term use of copper (Cu)-based fungicide sprays in orchards is associated with changes in soil Cu levels. However, there is a gap in knowledge regarding the potential accumulation of Cu in orchards and the associated impacts on the soil microbial structure. This study assessed the possibility of Cu accumulation in different avocado orchard farms and further evaluated the potential effect on soil microbial activities. Soil Cu levels were quantified in Tauranga and Northland, and three avocado orchards were analysed in each experimental location. All avocado farms in both sites received Cu-based fungicide sprays for over eight years. Soil samples were collected at a 0–20 cm depth from all six orchards. The soil total and bioavailable Cu, changes in soil chemical properties, microbial biomass, dehydrogenase activity, alkaline phosphatase activity, and acid phosphatase activity were measured. The results revealed that the total Cu and bioavailable Cu concentrations in Tauranga orchards were 81.3 and 0.32, 196.7 and 0.82, and 33.6 and 0.31 mg Cu kg−1 in Farms 1, 2, and 3, respectively. In Northland orchards, the total Cu and bioavailable Cu were 54.5 and 0.06, 18.4 and 0.77, and 46 and 0.34 mg Cu kg−1 in Farm 1, 2, and 3, respectively. Five out of six of the avocado orchard farms assessed in this study had total Cu concentrations greater than 30 mg Cu kg−1 reported in New Zealand native land. The magnitude of Cu accumulation was linked with soil pH and C content. No clear trend was observed between soil Cu concentrations and the soil microbial activity. Our study results demonstrated that the long-term use of Cu-based fungicide sprays can elevate Cu concentrations in orchard soils. Mitigation strategies need to be explored to abate the accumulation of Cu in orchard soils.

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Copper content in soils and litter from fruit orchards in Central Chile and its relationship with soil microbial activity

Cited by 5 publications

References 18 publications

Evaluation of Cu-toxicity in agricultural topsoil contaminated by different sources in central Chile

Evaluation of Cu-toxicity in agricultural topsoil contaminated by different sources in central Chile

Biochemical, Catabolic, and PGP Activity of Microbial Communities and Bacterial Strains from the Root Zone of Baccharis linearis in a Mediterranean Mine Tailing

The Potential Impact of Long-Term Copper Fungicide Sprays on Soil Health in Avocado Orchards

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