scholarly journals Potential Factors behind the Decline of Pinus pinea Nut Production in Mediterranean Pine Forests

Forests ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1167
Author(s):  
Yara El Khoury ◽  
Elise Noujeim ◽  
Giovanni Bubici ◽  
Eustachio Tarasco ◽  
Charbel Al Khoury ◽  
...  
Keyword(s):  
Climatic Factors ◽  
Mediterranean Area ◽  
Pinus Pinea ◽  
Cone Production ◽  
Pine Nut ◽  
Leptoglossus Occidentalis ◽  
Before And After ◽  
Nut Production ◽  
Potential Factors ◽  
Mediterranean Pine

Mediterranean stone pine nut is appreciated for its high economic and nutritional value. Starting in 2012, Pinus pinea nut production declined throughout the Mediterranean area. The dry cone syndrome associated with this decline and the introduction of Leptoglossus occidentalis occurred simultaneously. This study aims to evaluate potential reasons behind the decline in pine nut production in Lebanon, considering climatic factors and the invasion of L. occidentalis. Correlation analysis was used to examine a potential relationship between cone yield and the percentage of damaged seeds per cone. Climatic variables were also tested. Two time periods were considered for analysis: before and after 2012. Cone production and the percentage of damaged seeds were negatively correlated (r = −0.42). From 2012 to 2017, cone production declined by 50% and the percentage of damaged seeds increased on average from 3% in 2012 up to 60% in 2017. Correlations were detected between cone production and the temperature of the hottest three months of the year of harvesting, and between cone production and average temperatures during the year of cone initiation. A conjunction of factors that include L. occidentalis and climatic factors might have affected the pine nut production in Lebanon.

scholarly journals Enhanced tools for predicting annual stone pine (Pinus pinea L.) cone production at tree and forest scale in Inner Spain

2016 ◽  
Vol 25 (3) ◽  
pp. e079 ◽  
Author(s):  
Rafael Calama ◽  
Javier Gordo ◽  
Guillermo Madrigal ◽  
Sven Mutke ◽  
Mar Conde ◽  
...  
Keyword(s):  
Regional Differences ◽  
Floral Induction ◽  
National Forest Inventory ◽  
Pinus Pinea ◽  
Stone Pine ◽  
Data Set ◽  
New Model ◽  
Cone Production ◽  
Pine Nut ◽  
Influent Factors

Aim of the study: To present a new spatiotemporal model for Pinus pinea L. annual cone production with validity for Spanish Northen Plateau and Central Range regions. The new model aims to deal with detected deficiencies in previous models: temporal shortage, overestimation of cone production on recent years, incompatibility with data from National Forest Inventory, difficulty for upscaling and ignorance of the inhibitory process due to resource depletion.Area of study: Spanish Northern Plateau and Central Range regions, covering an area where stone pine occupies more than 90,000 haMaterial and methods: Fitting data set include 190 plots and more than 1000 trees were cone production has been annually collected from 1996 to 2014. Models were fitted independently for each region, by means of zero-inflated log normal techniques. Validation of the models was carried out over the annual series of cone production at forest scale.Results: The spatial and temporal factors influencing cone production are similar in both regions, thus the main regional differences in cone yield are related with differences in the phenological timing, the intensity of the influent factors and forest intrinsic conditions. A significant inhibition of floral induction by resource depletion was detected and included into the model. Upscaling the model results in accurate prediction at forest scale. Research highlights: [1] The new model for annual cone production surpass the detected deficiencies of previous models, accurately predicting recent decay in cone production; [2] Regional differences in cone production are due to phenological and seasonal climatic differences rather than to between provenances genetic differencesKeywords: zero-inflated models; pine nut; conelet losses; Leptoglossus occidentalis; forest upscaling. 

scholarly journals An Agronomic Approach to Pine Nut Production by Grafting Stone Pine on Two Rootstocks

Agriculture ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1034
Author(s):  
Mercè Guàrdia ◽  
Anna Teixidó ◽  
Rut Sanchez-Bragado ◽  
Neus Aletà
Keyword(s):  
Growth Response ◽  
Mast Seeding ◽  
Stone Pine ◽  
Cone Production ◽  
Growing Seasons ◽  
Pine Nut ◽  
Global Quality ◽  
Nut Production ◽  
Natural Stands

Stone pine (Pinus pinea) grows in natural stands within the Mediterranean basin and its nut is highly appreciated for its nutritional profile. Nevertheless, a decline in this species due to biotic and abiotic damages is currently being clearly observed. This situation has led to its development as a nut crop, to try to save its production and obtain regular harvests over the years. Under this agronomic scenario, the aim of this work was to compare the behavior of the stone pine grafted onto two rootstocks, P. pinea (PP) and P. halepensis (PH), by evaluating cone productivity, tree growth response, mast seeding patterns and pine nut composition. The field test was composed of 14 PH and 14 PP, randomly distributed into groups of 4–5 trees/rootstock. Data were from seven productive growing seasons. The results show higher growth and ripe cone production on PP rather than PH, although the productivity (cones/m2 canopy) was similar. Any effect of rootstock was observed on the mast seeding pattern and weight of cones, while the pine nut composition showed differences in the fatty acids content. The global quality of production was similar in PH and PP.

scholarly journals Influence of umbrella pine (Pinus pinea L.) stand type and tree characteristics on cone production

2016 ◽  
Vol 91 (6) ◽  
pp. 1019-1030 ◽  
Author(s):  
Ana Cristina Gonçalves ◽  
Anabela Afonso ◽  
Dulce G. Pereira ◽  
Anacleto Pinheiro
Keyword(s):  
Pinus Pinea ◽  
Cone Production ◽  
Stand Type ◽  
Umbrella Pine ◽  
Tree Characteristics

scholarly journals ‘Climatic factors control rodent seed predation in Pinus pinea L. stands in Central Spain’

2014 ◽  
Vol 71 (8) ◽  
pp. 873-883 ◽  
Author(s):  
Rubén Manso ◽  
Marta Pardos ◽  
Rafael Calama
Keyword(s):  
Seed Predation ◽  
Climatic Factors ◽  
Pinus Pinea ◽  
Central Spain

scholarly journals 30-year cone production dynamics in Siberian stone pine (Pinus sibirica) in the southern boreal zone: a causal interpretation

2021 ◽  
Vol 154 (3) ◽  
pp. 321-331
Author(s):  
Sergey Goroshkevich ◽  
Svetlana Velisevich ◽  
Aleksandr Popov ◽  
Oleg Khutornoy ◽  
Galina Vasilyeva
Keyword(s):  
Climatic Factors ◽  
Weather Conditions ◽  
Pinus Sibirica ◽  
Stone Pine ◽  
Siberian Stone Pine ◽  
Siberian Stone ◽  
Spring Frost ◽  
Cone Production ◽  
Pine Cone ◽  
Effective Temperatures

Background and aims – Siberian stone pine is a keystone species for Siberia, and numerous studies have analyzed Siberian stone pine seeding dynamics in connection with the dynamics of weather conditions. However, all studies were based on observations before 1990. The aim of the study was to expand our knowledge about the balance of weather and climatic factors in the regulation of cone production to enable conclusions about the current reproductive function in Siberian stone pine.Material and methods – We monitored Siberian stone pine cone production in the southeastern region of the Western Siberian Plain, in association with climatic factors, over a period of 30 years. To analyze the relationship with weather conditions, we used the trait mature cone number per tree and weather data obtained from the weather station in Tomsk.Key results – During this period, cone production decreased by about one-third, mainly caused by the complete absence of high yields. The main factor negatively affecting cone production was late spring frost: severe frost occurring with a large accumulated sum of effective temperatures resulted in full cone loss, and light frost substantially reduced cone number. A less important but significant climatic factor was September temperature: as the temperature increased, the cone number decreased in the following year. Over the last 30 years, the sum of the effective temperatures at which the last spring frost occurs, as well as the average September temperature, increased considerably, resulting in reduced cone production.Conclusion – If the current climatic trend is maintained, and especially if it is strengthened, Siberian stone pine cone production in the southern boreal forest zone on the Western Siberian Plane is unlikely to provide for the effective renewal of the species.

scholarly journals Optimal management in Pinus pinea L. stands combining silvicultural schedules for timber and cone production

Silva Fennica ◽  
2015 ◽  
Vol 49 (3) ◽  
Author(s):  
Santiago Pereira ◽  
Antonio Prieto ◽  
Rafael Calama ◽  
Luis Diaz-Balteiro
Keyword(s):  
Pinus Pinea ◽  
Optimal Management ◽  
Cone Production

Influencing factors associated with facial skin problems due to wearing masks during COVID-19 in China (Preprint)

2021 ◽  
Author(s):  
Shigui Yang ◽  
Chenyang Huang ◽  
Qingmiao Sun ◽  
Daixi JIang ◽  
Xiaobao Zhang ◽  
...  
Keyword(s):  
Sleep Time ◽  
Facial Skin ◽  
Skin Damage ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Factors Associated ◽  
Before And After ◽  
History Of ◽  
Potential Factors ◽  
Functional Pathway

BACKGROUND Background: Wearing a mask is one of the most effective measures to prevent COVID-19 virus infection and it is not yet clear what potential factors may be associated with facial skin problems while wearing masks. OBJECTIVE Objective: seek most suitable mask-wearing habits for public to avoid facial skin problem. METHODS Method: A cross-sectional survey was conducted through online and offline questionnaires on patterns of mask wearing and facial skin problems during COVID-19 from May 30-July 1, 2020. Multivariable regression was used to explore the potential factors associated with skin problems. We also recruited 19 subjects and compared the differences in their facial microbiomes before and after wearing masks. RESULTS Results: A total of 4385 valid questionnaires were finally analyzed and 1323 (33.1%) participants reported having facial skin problems while wearing masks. The risk factors associated with skin problems were having a history of facial skin problems (OR: 3.25, 95% CI: 2.80-3.76), facial skin allergies (OR: 1.37, 95% CI: 1.20-1.56), face washing frequency (≥3 times per day) (OR: 1.61, 95% CI: 1.07-2.43), daily sleep time <6 hours (OR: 2.38, 95% CI: 1.81-3.13), and average time spent wearing masks uninterruptedly ≥6 hours (OR: 1.67, 95% CI: 1.24-2.25). The analysis of the facial microbiome revealed that the abundance of Prevotella and Hemophilus decreased, and the functional pathway associated with cytochrome c was more predominant with the prolongation of wearing time. CONCLUSIONS Conclusion: The habit of wearing a mask and life behavior affect the occurrence of skin damage. Suitable mask types and mask-wearing habits should be recommended to avoid facial skin problems. CLINICALTRIAL NA

Population decline of Globodera rostochiensis in Western Serbia

Nematology ◽  
2017 ◽  
Vol 19 (2) ◽  
pp. 185-195
Author(s):  
Nikola Grujić ◽  
Milan Radivojević
Keyword(s):  
Climatic Factors ◽  
Population Decline ◽  
Potato Cultivar ◽  
Potato Production ◽  
Globodera Rostochiensis ◽  
Initial Population ◽  
Management Procedures ◽  
Before And After ◽  
New Generation ◽  
Annual Decline

Annual decline rates of potato cyst nematode (PCN) populations have been extensively studied. They vary considerably due to many factors, including potato cultivar, initial PCN density and climatic factors. Information is needed on PCN decline in potato fields in the specific conditions of Western Serbia, which is the centre for most of the local potato production, especially seed potato. We investigated the decline of Globodera rostochiensis over 1 or 2 years under the influence of PCN-resistant potato cv. Agria in the field and microplots. Decline was compared with fallow in Ponikve, near the original record of G. rostochiensis. Population decline in the field after cv. Agria was approximately 80%. In two parts of the field where potato cv. Agria was cropped once or twice with fallow before and after, the viable PCN population declined over 9 years to about 1% of initial values. In a third part of the field, left fallow for 9 years, 15% of the initial population was still viable, after an annual decline rate of 9.4%. The influence of volunteer potatoes on maintaining PCN populations was also examined. In the microplots, with a higher density of volunteers compared to the field, PCN decline under resistant potato cv. Agria was 70%. At crop harvest a new generation was recorded, suggesting its possible formation on susceptible volunteer potato. The full cysts represented 1% of all cysts examined and 13% of total second-stage juveniles found in the samples. The information will be useful for improvement of management procedures.

Seed provenance and fire-related reproductive traits of Pinus pinaster in central Spain

2009 ◽  
Vol 18 (8) ◽  
pp. 1003 ◽  
Author(s):  
Luis Gil ◽  
Rosana López ◽  
Álvaro García-Mateos ◽  
Inés González-Doncel
Keyword(s):  
Pinus Pinaster ◽  
Reproductive Traits ◽  
Livestock Grazing ◽  
Central Spain ◽  
Cone Production ◽  
Average Percentage ◽  
Burnt Wood ◽  
Pinus Pinaster Ait ◽  
Mediterranean Pine ◽  
Natural Stands

Disregarded for centuries, Mediterranean pine forests in Spain have been severely affected by human activities including fires and livestock grazing. As a consequence, reforestation programs were started by the late 1800s, albeit the origin of the seeds was not considered until the late 1960s. In July 2005, a large Pinus pinaster Ait. forest, located in Guadalajara (central Spain), burned down. In this area, we studied fire-related fitness traits in natural stands (zone N) and compared them to those of trees sown with seeds from foreign sources (zone S). Cone production per hectare in zone N doubled that found in zone S. In addition, zone N resulted in more saplings per hectare as well as more small trees bearing cones than zone S. In zone S, trees showed thicker crowns and less fructification resulting in open formations with low intraspecific competition. Whereas in the natural stands the average percentage of serotiny per tree was 32%, in the sown stands only one serotinous cone was found in seven unburned harvested trees. Compared with zone S, the presence of seedlings after springtime was almost nine times higher in zone N in spite of the damaging effects of logging and removal of burnt wood.

Sign in / Sign up

Export Citation Format

Share Document