ACORN Review: NPK fertilizer use in loblolly pine plantations: Who are we really feeding?

Hackman, Jacob J.; Rose, Benjamin D.; Frank, Hannah E. R.; Vilgalys, Rytas; Cook, Rachel L.; Garcia, Kevin

doi:10.1016/j.foreco.2022.120393

Cited by 12 publications

(9 citation statements)

References 72 publications

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“…In natural ecosystems, loblolly pine roots are often colonized simultaneously by multiple species of ECM fungi (Hackman et al, 2022), which can vary greatly in their response to salinity and benefits for host salt tolerance. Therefore, further research exploring interactions among ECM fungi with the same host would help to reveal the factors that shape the assembly of root‐associated symbiotic fungi under increasing salinity.…”

Section: Discussionmentioning

confidence: 99%

“…However, when sufficient K + was supplied, biomass of seedlings exposed to 200 mM of Na + was similar to plants growing under moderate salinity (Figure 5), suggesting that salt tolerance in loblolly pine may be enhanced by external K + availability even in NM conditions. However, in natural and agro‐ecosystems, trees from the Pinaceae family are always colonized by ECM fungi (Garcia et al, 2015; Hackman et al, 2022), making it critical to evaluate these responses to salinity in symbiotic conditions.…”

Section: Discussionmentioning

confidence: 99%

“…ECM fungi form symbiotic associations with the roots of most tree species in temperate and boreal forests (Becquer et al, 2019), and may play a crucial role in influencing loblolly pine nutrition in natural forests and managed plantations (Hackman et al, 2022). Through the expression of various transport proteins, the extraradical fungal hyphae transport essential nutrients and water from the soil toward host roots (Garcia et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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The ectomycorrhizal fungus Paxillus ammoniavirescens influences the effects of salinity on loblolly pine in response to potassium availability

Rose,

Dellinger,

Larmour

et al. 2024

Environmental Microbiology

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Salinity is an increasing problem in coastal areas affected by saltwater intrusion, with deleterious effects on tree health and forest growth. Ectomycorrhizal (ECM) fungi may improve the salinity tolerance of host trees, but the impact of external potassium (K+) availability on these effects is still unclear. Here, we performed several experiments with the ECM fungus Paxillus ammoniavirescens and loblolly pine (Pinus taeda L.) in axenic and symbiotic conditions at limited or sufficient K+ and increasing sodium (Na+) concentrations. Growth rate, biomass, nutrient content, and K+ transporter expression levels were recorded for the fungus, and the colonization rate, root development parameters, biomass, and shoot nutrient accumulation were determined for mycorrhizal and non‐mycorrhizal plants. P. ammoniavirescens was tolerant to high salinity, although growth and nutrient concentrations varied with K+ availability and increasing Na+ exposure. While loblolly pine root growth and development decreased with increasing salinity, ECM colonization was unaffected by pine response to salinity. The mycorrhizal influence on loblolly pine salinity response was strongly dependent on external K+ availability. This study reveals that P. ammoniavirescens can reduce Na+ accumulation of salt‐exposed loblolly pine, but this effect depends on external K+ availability.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The ectomycorrhizal fungus Paxillus ammoniavirescens influences the effects of salinity on loblolly pine in response to potassium availability

Rose,

Dellinger,

Larmour

et al. 2024

Environmental Microbiology

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“…Chemical of Litter magnesium content was higher in elm trees, whereas the carbon, organic matter, and calcium content was higher in pine trees. Nitrogen, phosphorus, and potassium are critical nutrients for forest tree productivity (Hackman et al 2022). The concentration of leaf nutrients such as phosphorus, potassium, and magnesium is typically lower in evergreens than in deciduous trees (Hashmi et al 2011).…”

Section: The Relationship Between Morphological Characteristics and P...mentioning

confidence: 99%

Estimating Litter production amount and quality for Eldar pine and umbrella Elm trees in historic city of Yazd

Kiani,

Nasiri,

Azimzadeh

et al. 2023

Preprint

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This study aimed to estimate the quantity and quality of litter produced by pine and elm trees in the green space of historic city of Yazd. Litterbags were used to collect the leaves during a year. For each species, amount of nitrogen, phosphorus, calcium, sulfur, carbon, magnesium, and potassium levels was measured monthly. The results showed that the annual mean weight of all components of litter was 4056.56 g for pine and 4106.67 g for elm trees. The greatest fall of pine needles was recorded in September. The highest fall of elm leaves was measured in November. The specific leaf area of elm and pine was calculated to be 169.38 and 29.96 cm2/g, respectively. The leaf area index for pine and elm was 0.91 and 7.99, respectively. The results showed no statistically significant difference between pine and elm trees in the leaf amount and total litter. The crown area of pine and elm trees, exhibited a direct effect on the amount of total litter produced. There was a significant difference between the two species in organic matter percentage, whereas there was no significant difference between them in the carbon, calcium, and magnesium content. Elm had a significantly lower C/N than pine. The specific leaf area of elm was higher than pine and it is better in this index. Although pines are evergreen, they produce a lot of litter during one year. Considering the planting spacing, which is usually 3×3 or 5×5 meters, the litter production is estimated to be 1.622 to 4.507 ton.ha− 1 for eldar pine and 1.642 to 4.562 ton.ha− 1 for umbrella elm trees respectively. Our results point out the need to revise the mixing ratio of conifers in plantations to reduce the litter collecting costs by Yazd municipality and increase the soil productivity.

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“…Loblolly pine occupies approximately 11.7 million hectares of intensively managed forest land within its native range, in addition to an expanding worldwide distribution of exotic commercial plantations [3] . Loblolly pine forms beneficial symbiotic associations with a variety of ectomycorrhizal (ECM) fungal species that play a major role in the tree hydromineral nutrition [4] , [5] , [6] . Split-root experiments have been used in other pine species to study interactions amongst ECM fungi, host trees, and soil conditions [7] , [8] , [9] .…”

Section: Introductionmentioning

confidence: 99%

Development of split-root assays for loblolly pine (Pinus taeda L.) seedlings to study ectomycorrhizal symbioses

2023

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ACORN Review: NPK fertilizer use in loblolly pine plantations: Who are we really feeding?

Cited by 12 publications

References 72 publications

The ectomycorrhizal fungus Paxillus ammoniavirescens influences the effects of salinity on loblolly pine in response to potassium availability

The ectomycorrhizal fungus Paxillus ammoniavirescens influences the effects of salinity on loblolly pine in response to potassium availability

Estimating Litter production amount and quality for Eldar pine and umbrella Elm trees in historic city of Yazd

Development of split-root assays for loblolly pine (Pinus taeda L.) seedlings to study ectomycorrhizal symbioses

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