Canadian Journal of Forest Research · 2021
Long-term effects on soil-water chemistry of wood ash and nitrogen application in a conifer forest
Ring, E., Jansson, G., Högbom, L., Jacobson, S.
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Long-term effects on soil-water chemistry of wood ash and ni…
Abstract
Wood-ash application to forestland has been proposed as a means to compensate for increased nutrient removal when harvesting logging residue in addition to stems. A study-plot experiment was established on a mineral soil site in Sweden to investigate how this measure affects soil-water chemistry. In 1995, 10 treatments were applied. Here, we present results from 9 to 17 years after application for eight of the treatments: control; 3 × 10 3 , 6 × 10 3 , and 9 × 10 3 kg·ha −1 of self-hardened and crushed wood ash (WA); 150 kg N·ha −1 supplied as ammonium nitrate; 3 × 10 3 kg WA and 150 kg N·ha −1 applied simultaneously; 3 × 10 3 kg WA with 150 kg N·ha −1 applied 1 month before the ash; and 3 × 10 3 kg·ha −1 of pelleted ash. Soil-water samples were collected from a depth of 50 cm. Treatment effects (p < 0.05) were detected in the electrical conductivity, pH, and concentrations of K + , Mg 2+ , Ca 2+ , Al, SO 4 2− -S, and B. Elevation of K + and SO 4 2− -S concentrations tended to cease toward the end of the study period. Effects were generally more pronounced with increasing ash dosage. No difference was detected between the 150 kg N·ha −1 treatment and the control. Despite the high solubility of the ash, its effects on soil-water chemistry could still be detected 9–17 years after application.
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Wood-ash application to forestland has been proposed as a means to compensate for increased nutrient removal when harvesting logging residue in addition to stems. A study-plot experiment was established on a mineral soil site in Sweden to investigate how this measure affects soil-water chemistry. In 1995, 10 treatments were applied. Here, we present results from 9 to 17 years after application for eight of the treatments: control; 3 × 10 3 , 6 × 10 3 , and 9 × 10 3 kg·ha −1 of self-hardened and crushed wood ash (WA); 150 kg N·ha −1 supplied as ammonium nitrate; 3 × 10 3 kg WA and 150 kg N·ha −1 applied simultaneously; 3 × 10 3 kg WA with 150 kg N·ha −1 applied 1 month before the ash; and 3 × 10 3 kg·ha −1 of pelleted ash. Soil-water samples were collected from a depth of 50 cm. Treatment effects (p < 0.05) were detected in the electrical conductivity, pH, and concentrations of K + , Mg 2+ , Ca 2+ , Al, SO 4 2− -S, and B. Elevation of K + and SO 4 2− -S concentrations tended to cease toward the end of the study period. Effects were generally more pronounced with increasing ash dosage. No difference was detected between the 150 kg N·ha −1 treatment and the control. Despite the high solubility of the ash, its effects on soil-water chemistry could still be detected 9–17 years after application.
Wood-ash application to forestland has been proposed as a means to compensate for increased nutrient removal when harvesting logging residue in addition to stems. A study-plot experiment was established on a mineral soil site in Sweden to investigate how this measure affects soil-water chemistry. In 1995, 10 treatments were applied. Here, we present results from 9 to 17 years after application for eight of the treatments: control; 3 × 10 3 , 6 × 10 3 , and 9 × 10 3 kg·ha −1 of self-hardened and crushed wood ash (WA); 150 kg N·ha −1 supplied as ammonium nitrate; 3 × 10 3 kg WA and 150 kg N·ha −1 applied simultaneously; 3 × 10 3 kg WA with 150 kg N·ha −1 applied 1 month before the ash; and 3 × 10 3 kg·ha −1 of pelleted ash. Soil-water samples were collected from a depth of 50 cm. Treatment effects (p < 0.05) were detected in the electrical conductivity, pH, and concentrations of K + , Mg 2+ , Ca 2+ , Al, SO 4 2− -S, and B. Elevation of K + and SO 4 2− -S concentrations tended to cease toward the end of the study period. Effects were generally more pronounced with increasing ash dosage. No difference was detected between the 150 kg N·ha −1 treatment and the control. Despite the high solubility of the ash, its effects on soil-water chemistry could still be detected 9–17 years after application.
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