Post‐fire effects on soil properties in red pine (pinus densiflora) stands

Flooding is an environmental stress for plants that not only limits aeration and nutrient acquisition, but also disturbs underground plant-associated fungal communities. Despite frequent flooding, red pine (Pinus densiflora) seedlings thrive in streamside environments. However, whether the compatible ectomycorrhizal fungi (EMF) of red pine are affected by natural flooding is unclear. As EMF are vital symbionts for the development of many trees and allow them to overcome various environmental stresses, in this study, the EMF species associated with red pine seedlings in a streamside environment in Korea were investigated after flooding. The EMF species in 47 seedlings collected from the streamside site were identified by observing their different morphotypes using internal transcribed spacer sequence analysis, and a total of 10 EMF species were identified. The EMF species diversity was lower than that in samples collected from a nearby forest analyzed as a control. The dominant EMF species of streamside seedlings included Amphinema spp., Rhizopogon luteolus, Suillus luteus, and Thelephora terrestris. This study could serve as a basis for investigating the mechanisms by which advantageous EMF aid plant development under flooding stress.

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Effects of elevated atmospheric CO2 on rhizosphere microbial community of Pinus densiflora (Korean red pine)

Forest Science and Technology ◽

10.1080/21580103.2020.1866089 ◽

2021 ◽

pp. 1-8

Author(s):

Hyunseok Lee ◽

Wi Young Lee ◽

Jun Won Kang

Keyword(s):

Microbial Community ◽

Pinus Densiflora ◽

Red Pine ◽

Atmospheric Co2 ◽

Elevated Atmospheric Co2 ◽

Korean Red Pine ◽

Rhizosphere Microbial Community

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Soil-vegetation relationships in Mediterranean forests after fire

Forest Ecosystems ◽

10.1186/s40663-021-00295-y ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Víctor Fernández-García ◽

Elena Marcos ◽

Sara Huerta ◽

Leonor Calvo

Keyword(s):

Soil Properties ◽

Mediterranean Ecosystems ◽

Fire Effects ◽

Mediterranean Forests ◽

Vegetation Growth ◽

Burned Areas ◽

Vegetation Height ◽

P Content ◽

Study Sites ◽

Soil Status

Abstract Background Wildfires are one of the major environmental concerns in Mediterranean ecosystems. Thus, many studies have addressed wildfire impacts on soil and vegetation in Mediterranean forests, but the linkages between these ecosystem compartments after fire are not well understood. The aim of this work is to analyze soil-vegetation relationships in Mediterranean burned forests as well as the consistency of these relationships among forests with different environmental conditions, at different times after fire, and among vegetation with different functional traits. Results Our results indicate that study site conditions play an important role in mediating soil-vegetation relationships. Likewise, we found that the nature of soil-vegetation relationships may vary over time as fire effects are less dominant in both ecosystem compartments. Despite this, we detected several common soil-vegetation relationships among study sites and times after fire. For instance, our results revealed that available P content and stoichiometry (C:P and N:P) were closely linked to vegetation growth, and particularly to the growth of trees. We found that enzymatic activities and microbial biomass were inversely related to vegetation growth rates, whereas the specific activities of soil enzymes were higher in the areas with more vegetation height and cover. Likewise, our results suggest that resprouters may influence soil properties more than seeders, the growth of seeders being more dependent on soil status. Conclusions We provide pioneer insights into how vegetation is influenced by soil, and vice-versa, in Mediterranean burned areas. Our results reflect variability in soil-vegetation relationships among study sites and time after fire, but consistent patterns between soil properties and vegetation were also detected. Our research is highly relevant to advance in forest science and could be useful to achieve efficient post-fire management.

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Post-fire consequences for leaf breakdown in a tropical stream

Acta Limnologica Brasiliensia ◽

10.1590/s2179-975x4118 ◽

2019 ◽

Vol 31 ◽

Author(s):

Renan de Souza Rezende ◽

Cristiano Queiroz de Albuquerque ◽

Andrezza Sayuri Victoriano Hirota ◽

Paulo Fernandes Roges Souza Silva ◽

Ricardo Keichi Umetsu ◽

...

Keyword(s):

Leaf Litter ◽

Fungal Biomass ◽

Mesh Size ◽

Fire Effects ◽

Dry Mass ◽

Tropical Stream ◽

Fire Event ◽

Litter Bags ◽

Fine Mesh ◽

Post Fire Effects

Abstract Aim Wildfire is a natural pulsed disturbance in landscapes of the Savannah Biome. This study evaluates short-term post-fire effects on leaf litter breakdown, the invertebrate community and fungal biomass of litter from three different vegetal species in a tropical stream. Methods Senescent leaves of Inga laurina, Protium spruceanum and Rircheria grandis (2 ± 0.1 g dry mass) were individually placed in litter bags (30 × 30 cm: 10 mm coarse mesh and 0.5 mm fine mesh) and submerged in the study stream before and after fire. Replicate bags (n = 4; individually for each species, sampling time, fire event and mesh size) were then retrieved after 20 and 40 days and washed to separate the invertebrates before fire event and again immediately after fire. Disks were cut from leaves to determine ash-free dry mass, while the remaining material was oven-dried to determine dry mass. Results The pre-fire mean decomposition coefficient (k = -0.012 day-1) was intermediate compared to that reported for other savannah streams, but post-fire it was lower (k = -0.007 day-1), due to decreased allochthonous litter input and increased autochthones production. Intermediate k values for all qualities of litter post-fire may indicate that fire is equalizing litter quality in the stream ecosystem. The abundance of scrapers was found to be more important than fungal biomass or shredder abundance, probably due to their functioning in leaf fragmentation while consuming periphyton growing on leaf litter. Conclusions Theses results indicate that fire can modify the relationships within decomposer communities in tropical stream ecosystems.

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