Biochar engineering and ageing influence the spatiotemporal dynamics of soil pH in the charosphere

Chen, Xuejiao; Lewis, Steven; Heal, Kate; Lin, Qimei; Sohi, Saran

doi:10.1016/j.geoderma.2020.114919

Cited by 36 publications

(9 citation statements)

References 51 publications

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“…Buffer capacity is the ability of soils to resist changes in pH caused by various pollutants entering the environment (Covelo et al, 2007;Jeffery & Uren, 1983;Kabiri et al, 2021;Schaller, 1987;Wilson & Bell, 1996). It is an important parameter defining the geochemical character of soils, especially in areas exposed to a long-term and heavy immission of particulate pollution, which may cause, that is, acid rain that considerably changes soil pH (Beiyuan et al, 2017;X. Chen et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Changes in soil pH and mobility of heavy metals in contaminated soils

Kicińska

Pomykała

Izquierdo

2021

European J Soil Science

169

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In the present paper, the authors attempt to explain the importance of pH in soil environment studies and show what mistakes to avoid when measuring pH and interpreting the results obtained. The tests conducted (i.e., extraction in aqua regia, buffer capacity determination, and the impact of acidification on the amount of heavy metals extracted from soils) demonstrated how soil pollution and buffer capacity affect the pace of extracting cadmium (Cd), lead (Pb) and zinc (Zn) cations from heavily polluted and unpolluted soils following gradual acidification. It was shown that soil acidification caused a significant increase in metal mobility in the following order Cd > Zn > Pb and that the highest decrease in pH was observed after adding the first portion of acid. Further addition of acid caused a gradually lower decrease in pH. Soils from the polluted area presented a high buffer capacity. The control samples displayed a distinctly poorer resistance to pH changes in the soil environment. Special focus was placed on cadmium due to its high mobility in soils, even with neutral and slightly alkaline pH. The analyses revealed that in areas heavily polluted by long-term industrial activity (I geo > 5 for Zn, Pb and Cd), it is very important to conduct extensive geochemical studies related to the presence and circulation of particularly toxic elements. This is because every environmental factor, especially pH, may significantly affect their mobility, causing metal ions to become more or less active or increasing or decreasing environmental risk related to their presence. Highlights• Soil acidification caused a significant increase in metal mobility in the following order: Cd > Zn > Pb.• A special focus needs to be placed on Cd due to its high mobility in soils (up to 70% of total concentration), even with neutral and slightly alkaline pH.• A higher pH buffering capacity would lead to a lower increase in percentage of bioavailable pollutants with an increase in acidity.

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Section: Discussionmentioning

confidence: 99%

Changes in soil pH and mobility of heavy metals in contaminated soils

Kicińska

Pomykała

Izquierdo

2021

European J Soil Science

169

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“…Moreover, it was reported that biochar application increases soil pH due to the diffusion of minerals (K, Ca, and Mg) from the biochar surface to soil. In addition, biochar has a rapid localized impact on soil pH with the distance from biochar [54,55]. Thus, the impact of biochar on plants is related to the original soil condition and the adaptability of plants to soil pH.…”

Section: Discussionmentioning

confidence: 99%

Biochar Improves Root Growth of Sapium sebiferum (L.) Roxb. Container Seedlings

Chen

2021

Agronomy

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Background: The faulty development of the root system is a major threat that affects the survival rate of container seedlings of Sapium sebiferum in the transplanting and reforestation processes. The current study was conducted to determine the impact of biochar on the root growth and development of S. sebiferum container seedlings. Methods: Varied concentrations (1%, 3%, and 5%) of straw and bamboo biochar were applied in six groups, whereas the control group (CK) was only treated with matrix. Results: The treatment with 3% straw biochar (C2) proved to be the most effective soil conditioner for cultivating S. sebiferum seedlings. Moreover, C2 increased seedling height (58.92%); ground diameter (33.86%, biomass of the over-ground part (12.73 g), the underground part (7.48 g), and the fibrous part (0.076 g) compared to the CK (control). Conclusions: Biochar not only improved the root morphology by developing primary lateral roots, but it also accelerated the assimilation of N from the matrix to indirectly facilitate stem growth through enhancing NR activity. The change in root growth strategy contributed to the growth in S. sebiferum seedlings, thereby improving the survival rate during transplanting and reforestation.

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“…By altering soil properties (Joseph et al 2021) combined with the self-promotion effect of biochar-carbon (Lehmann et al 2011), biochar prompts root development (Abiven et al 2015;Lehmann et al 2011;Xiang et al 2017), including pine (Pinus spp.) roots in certain forest systems (Wardle et al 1998) Root interaction with the charosphere could be a key factor in plants accessing biochar-derived P (Chen et al 2021). The porous structure of unprocessed wood-derived biochar makes it easier for roots and hyphae to penetrate and colonize biochar particles and the high internal and external surface provides The present study investigates biochar as a sustainable fertilizer for seedling establishment in P-de cient forest ecosystems and investigates the interaction between the charosphere and rhizosphere.…”

Section: Introductionmentioning

confidence: 99%

Preferences of Pinus Sylvestris Seedling Roots for Different Phosphorus Sources under Phosphorus-Deficient Conditions

Lei

Creber

Bol

et al. 2022

Preprint

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PurposePhosphorus (P) is a limiting nutrient in many managed forests. To further understand the risks and benefits of biochar as a sustainable P source in forest management, an improved mechanistic understanding of its interactions in root systems is required.MethodsA rhizobox experiment was conducted to observe root response of P. sylvestris (Scots pine) seedlings to different biochars in comparison to triple superphosphate (TSP) fertilizer as a P source. Three types of wood-derived biochar were compared: biochar from mixed softwood pellets (“Reference biochar”); from the vascular cambium zone of Picea sitchensis (Sitka spruce) (“VCZ biochar”) and from mixed softwood pellets infused with TSP (“Processed biochar”). These alternative types of biochar presented a range of available P from low to high. The activity of roots in the rhizoboxes was monitored and analyzed using spatial GIS software.ResultsThe total length of P. sylvestris roots did not significantly differ between treatments. However, roots showed strong preference for soil proximal to VCZ biochar and strong avoidance to TSP fertilizer. There was a milder avoidance effect for Processed biochar. Different preferences were mainly explained by available P: roots favored a moderate, sustained P source and avoided sources of high available P. The avoidance effect can be attributed partially to a considerable drop in soil pH around TSP fertilizer. ConclusionThe concentration and duration of P availability affects the root response of P. sylvestris to sources of P. In P-deficient conditions, the development of P. sylvestris roots can be markedly improved by introducing biochar with a certain native P content.

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Biochar engineering and ageing influence the spatiotemporal dynamics of soil pH in the charosphere

Cited by 36 publications

References 51 publications

Changes in soil pH and mobility of heavy metals in contaminated soils

Changes in soil pH and mobility of heavy metals in contaminated soils

Biochar Improves Root Growth of Sapium sebiferum (L.) Roxb. Container Seedlings

Preferences of Pinus Sylvestris Seedling Roots for Different Phosphorus Sources under Phosphorus-Deficient Conditions

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