Vegetation dynamics following compound disturbance in a dry pine forest: fuel treatment then bark beetle outbreak

2019 ◽  
Vol 30 (2) ◽  
Author(s):  
Justin S. Crotteau ◽  
Christopher R. Keyes ◽  
Sharon M. Hood ◽  
Andrew J. Larson
Keyword(s):  
Bark Beetle ◽  
Vegetation Dynamics ◽  
Pine Forest ◽  
Fuel Treatment ◽  
Forest Fuel ◽  
Compound Disturbance

scholarly journals A comparative characteristic of fungal communities associated with Ips acuminatus in different regions of Ukraine

2019 ◽  
pp. 118-128
Author(s):  
Kateryna Davydenko
Keyword(s):  
Bark Beetle ◽  
Fungal Community ◽  
Bark Beetles ◽  
Diversity Index ◽  
Pathogenic Fungi ◽  
Pine Forest ◽  
Comparative Characteristic ◽  
Ophiostomatoid Fungi ◽  
Decay Fungi ◽  
Sphaeropsis Sapinea

Pine bark beetles are typically associated with complexes of fungi that could reveal different functional interaction. Thus, previously nonaggressive bark beetle Ips acuminatus is considering now to be among the most serious pests of pine forest in Ukraine and other European countries and vectored fungal community is very important to assess total harm of this bark beetle. The aim of this study was to reveal the vectored fungal community associated with the pine engraver beetle, I. acuminatus with special emphasis on pathogenic fungi for further evaluation of harm bark-beetle - fungi association for Ukrainian forest. In total, 288 adult beetles were collected from Scots pine trees at six different sites through Ukraine. DNA sequencing as fungal culturing from all beetles resulted in 1681 isolates and amplicons representing 42 fungal taxa. NCBI BLAST search revealed that the overall fungal community was composed of 94 species, of which 80.85% were Ascomycota, followed by Basidiomycota and unidentified fungal group, which accounted for 10.6% and 8.5 % of the total sequences, respectively. Among these, the most commonly detected fungi for pooling dataset were Sphaeropsis sapinea (23.6%), Cladosporium pini-ponderosae (19.44%), Ophiostoma ips (19.1%), Ophiostoma canum (19.1%) and Cladobotryum mycophilum (18.06%). In the pooled dataset of isolates and amplicons for each site, Shannon diversity indices ranged between 1.9 and 2.9 while Simpson diversity index varied between 0.69 and 0.89 indicating rich species diversity. In total twelve ophiostomatoid species were detected. All ophiostomatoid fungi were showing varying degrees of virulence and O. minus was the most aggressive fungus in previous studies. It is concluded that I. acuminatus vectors a species-rich fungal community including pathogens such as ophiostomatoid fungi, Sphaeropsis sapinea, different needle pathogens and wood decay fungi that seems to be very important for the assessment of threat of I. acuminatus to the pine forest in Ukraine.

scholarly journals Evaluating Sensitivity of the Ranking of Forest Fuel Treatments to Manager’s Risk Attitudes and the Importance of Treatment Objectives, Montana, USA

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Tony Prato ◽  
Travis Paveglio
Keyword(s):  
Conceptual Framework ◽  
Utility Function ◽  
Risk Attitudes ◽  
Risk Averse ◽  
Fuel Treatment ◽  
Utility Values ◽  
Forest Fuel ◽  
Importance Ratings ◽  
Forested Areas

This study develops a conceptual framework for evaluating the sensitivity of the ranking of forest fuel treatment strategies (FTSs) to variation in managers’ risk attitudes and the importance ratings managers assign to fuel treatment objectives and demonstrates the application of the framework using a case study. The conceptual framework involves (1) defining a utility function on an index that is a weighted average of fuel treatment objectives and incorporates a manager’s risk attitude; (2) using the utility function to calculate utility values for FTSs; (3) applying the stochastic efficiency with respect to a function method to utility values to obtain certainty equivalents (CEs); and (4) ranking FTSs based on statistically significant differences in median CEs for pairs of FTSs. The case study involves three (federal, state, and private) forested areas in Flathead County, Montana, USA, three FTSs (i.e., Community Wildfire Protection Plan (CWPP) Priority; CWPP & Wildland-Urban Interface Priority; and No Priority), three treatment objectives (i.e., minimizing expected residential monetary losses from wildfire, minimizing expected deviation of forest ecological conditions from their historic range and variability, and maximizing expected net returns from timber harvesting associated with fuel treatment), two risk attitudes (i.e., almost risk neutral and highly risk averse), and 35 weight scenarios for treatment objectives. Case study results are used to test the hypothesis that the ranking of FTSs is sensitive to manager’s risk attitudes and the importance ratings for management objectives. The ranking of FTSs for the three forested areas was insensitive for an almost risk neutral manager and sensitive for a highly risk averse manager. In general, the case study indicates that the ranking of FTSs is sensitive to both a forest manager’s risk attitudes and the importance ratings assigned to fuel treatment objectives.

Bark beetle community structure under four ponderosa pine forest stand conditions in northern Arizona

2002 ◽  
Vol 170 (1-3) ◽  
pp. 145-160 ◽  
Author(s):  
Guillermo Sánchez-Martı́nez ◽  
Michael R. Wagner
Keyword(s):  
Community Structure ◽  
Bark Beetle ◽  
Ponderosa Pine ◽  
Forest Stand ◽  
Pine Forest ◽  
Northern Arizona ◽  
Ponderosa Pine Forest ◽  
Stand Conditions

scholarly journals Does soil respiration decline following bark beetle induced forest mortality? Evidence from a lodgepole pine forest

2015 ◽  
Vol 214-215 ◽  
pp. 201-207 ◽  
Author(s):  
B. Borkhuu ◽  
S.D. Peckham ◽  
B.E. Ewers ◽  
U. Norton ◽  
E. Pendall
Keyword(s):  
Soil Respiration ◽  
Bark Beetle ◽  
Lodgepole Pine ◽  
Pine Forest ◽  
Forest Mortality

scholarly journals Decline of pine forest in Ukraine with contribution from bark beetles: causes and trends

2019 ◽  
Author(s):  
В.Л. Мешкова
Keyword(s):  
Bark Beetle ◽  
Bark Beetles ◽  
Forest Health ◽  
Weather Conditions ◽  
Vegetation Period ◽  
Pine Forest ◽  
Laboratory Research ◽  
Natural Zones ◽  
Logging Residues ◽  
The Impact

Цель исследования обобщение опубликованных материалов и собственных данных об условиях возникновения очагов усыхания сосновых лесов и возможностях минимизации негативных последствий. Источники данных справочные материалы по структуре лесного фонда лесохозяйственных предприятий, состоянию лесов, характеристики погодных условий, результаты собственных полевых и лабораторных исследований (обследований насаждений, лабораторного выращивания короедов в отрезках ветвей, расчета популяционных показателей). За последние десятилетия изменились показатели тепла, влаги и континентальности, характеризующие лесоклиматические зоны, что влияет на состояние лесов и их восприимчивость к заселению короедами. Возрастание значения короедов рода Ips в комплексе стволовых вредителей сосновых лесов Украины связано с их поливольтинностью. Жуки отдельных поколений и фенологических групп вершинного короеда (Ips acuminatus) заселяют ослабленные деревья, ветровал и порубочные остатки в течение значительной части вегетационного периода. Доказана возможность развития трех поколений вершинного короеда в году в Харьковской области, однако быстрое высыхание порубочных остатков с повышением температуры может препятствовать завершению развития вредителя. Медленное высыхание заготовленной древесины и порубочных остатков в Полесье стало важной причиной интенсивного развития вспышек короедов в этом регионе. Предложено оценивать потенциальную площадь очагов усыхания в областях или природных зонах с учетом доли чистых сосновых насаждений и их возраста, а на уровне лесных массивов учитывать соседство выделов с вырубками. Отмечено несовершенство нормативной базы лесного хозяйства, препятствующее заготовке древесины в очагах короедного усыхания до того, как она превратится в дровяную. The goal of the research was integration of published and own data on the conditions for the occurrence of foci of pine forest decline and the prospects for mitigating this process. The data were obtained from reference materials on forest fund structure in forest enterprises, forest health, weather conditions, and the results of own field and laboratory research (forest inspections, laboratory rearing of the bark beetles in branches, and evaluation of population parameters). The main parameters of the forest climatic zones (heat, humidity, and continentality) have changed during the last decades. This affects forests health and their susceptibility to bark beetle colonization. The increase in the impact of Ips genus bark beetles in the complex of stem pests in pine forests of Ukraine is pertinent to their multivoltine development. Beetles of certain generations and phenological groups of pine engraver beetle (Ips acuminatus) colonize weakened and windthrown trees and logging residues during considerable part of vegetation period. A possibility of development of three generations per year has been proven for Ips acuminatus in Kharkov region (foreststeppe zone). However, quick drying of logging residues combined with increasing temperature may prevent the completion of pests development. Slow drying of harvested wood and logging residues in Polesie was an important reason for the intensive development of bark beetle outbreaks in the region. It was suggested to evaluate a potential area of drying forest in the regions or natural zones with consideration of the proportion of pure pine stands and their age. For certain forest stands, the proximity of every plot to clearcuts of the last two years must be taken into account. The flaws of forestry regulatory legislation are noted. These flaws prevent timely harvesting of timber in the bark beetles foci before this timber turns into firewood.

Determining Forest Fuel Treatment Levels for the Bitterroot Front Using VDDT

2003 ◽  
pp. 47-59 ◽  
Author(s):  
Jim Merzenich ◽  
Werner Kurz ◽  
Sarah Beukema ◽  
Mike Arbaugh ◽  
Susan Schilling
Keyword(s):  
Fuel Treatment ◽  
Forest Fuel

scholarly journals Resiliency of an Interior Ponderosa Pine Forest to Bark Beetle Infestations Following Fuel-Reduction and Forest-Restoration Treatments

Forests ◽  
2014 ◽  
Vol 5 (1) ◽  
pp. 153-176 ◽  
Author(s):  
Christopher Fettig ◽  
Stephen McKelvey
Keyword(s):  
Bark Beetle ◽  
Ponderosa Pine ◽  
Forest Restoration ◽  
Pine Forest ◽  
Fuel Reduction ◽  
Ponderosa Pine Forest

Indirect effects of bark beetle-generated dead wood on biogeochemical and decomposition processes in a pine forest

Oecologia ◽  
2018 ◽  
Vol 188 (4) ◽  
pp. 1209-1226
Author(s):  
Courtney M. Siegert ◽  
Natalie A. Clay ◽  
Juliet D. Tang ◽  
Lisa G. Garrigues ◽  
John J. Riggins
Keyword(s):  
Bark Beetle ◽  
Indirect Effects ◽  
Dead Wood ◽  
Pine Forest ◽  
Decomposition Processes
Sign in / Sign up

Export Citation Format

Share Document