Effect of plant-derived smoke water and potassium nitrate on germination of understory boreal forest plants

MacKenzie, Dean; Naeth, M. Anne

doi:10.1139/cjfr-2019-0016

Cited by 8 publications

(6 citation statements)

References 40 publications

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“…However, several studies have revealed the regulation of seed dormancy (or germination) by temperature is involved in the change in the sensitivity of seed germination to nitrate. For example, the sensitivity of seeds to nitrate increased after D r a f t seeds were treated with cold stratification (Bouwmeester et al 1994;Mackenzie and Naeth 2019). For seeds buried in soil, nitrate sensitivity changed during the dormancy cycle, driven by seasonal temperature (Bouwmeester et al 1994;Finch-Savage and Footitt 2017).…”

Section: Discussionmentioning

confidence: 99%

Effects of low temperature and nitrogen addition during cold stratification on seed germination of Korean pine (Pinus koraiensis)

Song

Gao

2021

Can. J. For. Res.

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Pinus koraiensis seeds are primary dormant following dispersal, restricting natural regeneration of populations. The aim of this study was to determine the combined effects of increasing low temperature and nitrogen addition during cold stratification on seed germination. We stratified seeds at 0 oC, 5 oC and 10 oC for 3.5 months. At each cold stratification temperature, seeds were subjected to 0 (0 nitrogen), 0.08 (low nitrogen), 0.16 (medium nitrogen) and 0.25 mol L-1(high nitrogen) nitrate additions. Seed germination response was tested at 25/15 oC and 10/5 oC. Under 0 nitrogen and high nitrogen levels, increasing cold stratification temperature did not remarkedly affect seed germination at 25/15 oC, but significantly inhibited seed germination at 10/5 oC. At medium nitrogen level, seed germination at both 25/15 oC and 10/5 oC were all significantly decreased. At low nitrogen level, increasing cold stratification temperature significantly decreased germination percentage at 25/15 oC from 86.7% (0 oC) to 50.2% (10 oC), but did not markedly change seed germination percentage at 10/5 oC. We suggest that the effect of increasing cold stratification temperature on seed germination of Pinus koraiensis depends on both the level of nitrogen addition during cold stratification and subsequent incubation temperature after cold stratification.

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Section: Discussionmentioning

confidence: 99%

Effects of low temperature and nitrogen addition during cold stratification on seed germination of Korean pine (Pinus koraiensis)

Song

Gao

2021

Can. J. For. Res.

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“…This trend may be due to the quantity and quality of fuel available to historic fires, potentially preventing severe combustion of the organic horizon and limiting belowground carbon stock losses at fire-origin sites. Alternatively, these trends may be due to common boreal post-harvesting practices, which can also reduce belowground stocks by actively relocating or removing post-harvest organic soils (Colombo, Parker, Luckai, Dang, & Cai, 2005;Frey, Lieffers, Munson, & Blenis, 2003). Site preparation techniques remove surface soils from the forest floor at large to limit competition from less profitable species, while generating microclimate conditions that can enhance the productivity of target tree species (Frey et al, 2003).…”

Section: Legacy Effects Of Human Land Use On Contemporary Carbon Dymentioning

confidence: 99%

Wildfire combustion and carbon stocks in the southern Canadian boreal forest: Implications for a warming world

Dieleman

Rogers

Potter

et al. 2020

Global Change Biology

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Boreal wildfires are increasing in intensity, extent, and frequency, potentially intensifying carbon emissions and transitioning the region from a globally significant carbon sink to a source. The productive southern boreal forests of central Canada already experience relatively high frequencies of fire, and as such may serve as an analog of future carbon dynamics for more northern forests. Fire-carbon dynamics in southern boreal systems are relatively understudied, with limited investigation into the drivers of pre-fire carbon stocks or subsequent combustion. As part of NASA's Arctic-Boreal Vulnerability Experiment, we sampled 79 stands (47 burned, 32 unburned) throughout central Saskatchewan to characterize above-and belowground carbon stocks and combustion rates in relation to historical land use, vegetation characteristics, and geophysical attributes. We found southern boreal forests emitted an average of 3.3 ± 1.1 kg C/m 2 from field sites. The emissions from southern boreal stands varied as a function of stand age, fire weather conditions, ecozone, and soil moisture class. Sites affected by historical timber harvesting had greater combustion rates due to faster carbon stock recovery rates than sites recovering from wildfire events, indicating that different boreal forest land use practices can generate divergent carbon legacy effects. We estimate the 2015 fire season in Saskatchewan emitted a total of 36.3 ± 15.0 Tg C, emphasizing the importance of southern boreal fires for regional carbon budgets. Using the southern boreal as an analog, the northern boreal may undergo fundamental shifts in forest structure and carbon dynamics, becoming dominated by stands <70 years old that hold 2-7 kg C/m 2 less than current mature northern boreal stands. Our latitudinal approach reinforces previous studies showing that northern boreal stands are at a high risk of holding less carbon under changing disturbance conditions.

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“…Seed germination test (Mackenzie and Naeth, 2019): full, unbroken seeds of C. pilosula were selected. Seeds were soaked in distilled water for 6 h before the test, then surface-sterilized with 5% sodium hypochlorite solution for 15 min, and then rinsed several times with sterile water.…”

Section: Seed Germination Testmentioning

confidence: 99%

Abatement effects of different soil amendments on continuous cropping of Codonopsis pilosula

Yang,

Qiu,

Jiang

et al. 2024

Front. Plant Sci.

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IntroductionCodonopsis pilosula is widely sought-after in China as a substitute for the more expensive ginseng. Continuous cropping of C. pilosula supports a vibrant health-supplement industry but requires significant inputs of fertilizers which increase production costs and degrade the environment.MethodsHere, three environmentally-friendly natural fertilizers, including biochar, bacterial fertilizer, and vermicompost, were used at different concentrations (undiluted, diluted 10 times, diluted 50 times) to determine their efficacy in seed germination and growth physiology of C. pilosula in continuous cropping.ResultsThe results showed that biochar, bacterial fertilizer, and vermicompost with different concentrations of leachate could all increase the germination rate, germination potential and germination index of C. pilosula seeds treated with inter-root soil leachate of continuous C. pilosula; increase the activity of antioxidant enzymes (superoxide dismutase and peroxidase) in C. pilosula seedlings under the stress of inter-root soil leachate of continuous C. pilosula, reduce the over-accumulation of malondialdehyde (MDA) content, and increase the resistance of C. pilosula seedlings. After transplanting, superoxide dismutase (SOD) activity increased by an average of 16.1%. Peroxidase (POD) levels showed an average increase of 16.4%. Additionally, there was a significant reduction in the MDA content, with an average decrease of 50%, and the content of osmotic-regulating substances (free proline content and soluble protein content) exhibited a significant increase.DiscussionIn conclusion, biochar, bacterial manure, and vermicompost have the potential to overcome the challenges of extensive fertilizer use in continuous cropping of C. pilosula.

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Effect of plant-derived smoke water and potassium nitrate on germination of understory boreal forest plants

Cited by 8 publications

References 40 publications

Effects of low temperature and nitrogen addition during cold stratification on seed germination of Korean pine (Pinus koraiensis)

Effects of low temperature and nitrogen addition during cold stratification on seed germination of Korean pine (Pinus koraiensis)

Wildfire combustion and carbon stocks in the southern Canadian boreal forest: Implications for a warming world

Abatement effects of different soil amendments on continuous cropping of Codonopsis pilosula

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