Managing semi-arid oak forests (Quercus brantii Lindl.): Mature oak trees of different dimensions create contrasted microhabitats influencing seedling quality

2022 ◽  
Vol 304 ◽  
pp. 114269
Author(s):  
Mehdi Heydari ◽  
Hamzeh Asadi-Rad ◽  
Jaafar Hosseinzadeh ◽  
Somayeh Hajinia ◽  
D. Alexander Wait ◽  
...  
2021 ◽  
Vol 167 ◽  
pp. 106268
Author(s):  
Mehdi Heydari ◽  
Sina Attar Roshan ◽  
Reza Omidipour ◽  
Manuel Esteban Lucas-Borja ◽  
Bernard Prévosto

1993 ◽  
Vol 10 (4) ◽  
pp. 149-153 ◽  
Author(s):  
Richard C. Schlesinger ◽  
Ivan L. Sander ◽  
Kenneth R. Davidson

Abstract In much of the Central Hardwood Forest Region, oak species are not regenerating well, even though large oak trees are common within the existing forests. The shelterwood method has been suggested as a potential tool for establishing and developing advanced regeneration where it is lacking. The 10-yr results from a study of several variants of the shelterwood method show that on good sites in the Missouri Ozarks Region, a heavy understory treatment is most important, while on average sites, reducing the overstory density level is most important. The right combinations of overstory and understory treatments will likely be different for different stands and locations, but the shelterwood method does appear to be a useful silvicultural tool for perpetuating central hardwood oak forests. North. J. Appl. For. 10(4): 149-153.


2019 ◽  
Vol 11 (2) ◽  
pp. 318-318
Author(s):  
Mehdi Heydari ◽  
Fatemeh Aazami ◽  
Marzban Faramarzi ◽  
Reza Omidipour ◽  
Masoud Bazgir ◽  
...  

2021 ◽  
Vol 13 (21) ◽  
pp. 4367
Author(s):  
Seyed Arvin Fakhri ◽  
Hooman Latifi

Semi-arid tree covers, in both high and coppice growth forms, play an essential role in protecting water and soil resources and provides multiple ecosystem services across fragile ecosystems. Thus, they require continuous inventories. Quantification of forest structure in these tree covers provides important measures for their management and biodiversity conservation. We present a framework, based on consumer-grade UAV photogrammetry, to separately estimate primary variables of tree height (H) and crown area (A) across diverse coppice and high stands dominated by Quercus brantii Lindl. along the latitudinal gradient of Zagros mountains of western Iran. Then, multivariate linear regressions were parametrized with H and A to estimate the diameter at breast height (DBH) of high trees because of its importance to accelerate the existing practical DBH inventories across Zagros Forests. The estimated variables were finally applied to a model tree aboveground biomass (AGB) for both vegetative growth forms by local allometric equations and Random Forest models. In each step, the estimated variables were evaluated against the field reference values, indicating practically high accuracies reaching root mean square error (RMSE) of 0.68 m and 4.74 cm for H and DBH, as well as relative RMSE < 10% for AGB estimates. The results generally suggest an effective framework for single tree-based attribute estimation over mountainous, semi-arid coppice, and high stands.


Author(s):  
И.А. Уткина ◽  
В.В. Рубцов

Дубовая широкоминирующая моль Acrocercops brongniardella (Fabricius, 1798) (Lepidoptera, Gracillariidae) давно известный и массово размножающийся в дубравах европейской части России, Украины, странах Западной Европы вид филлофаговминёров. В последние два десятилетия появились свидетельства увеличения её численности в ряде регионов. Вместе с тем до сих пор остаются пробелы в знаниях об особенностях развития этого вида. По мнению одних ученых, моль производит одно поколение в год, других два. Такое расхождение может быть связано с разной погодной ситуацией в разных местообитаниях или изменяющимися условиями одного и того же местообитания. При одновременном массовом размножении дубовой широкоминирующей моли и зимней пяденицы Operophtera brumata (Linnaeus, 1758) (Lepidoptera: Geometridae) дефолиация крон обеих феноформ дуба происходит поразному, что связано с тем, что первичную листву ранней формы дуба, повреждённую зимней пяденицей, моль не заселяет и начинает минировать листья дуба поздней и промежуточных форм, не повреждённых зимней пяденицей, что увеличивает уровень их дефолиации. После окукливания зимней пяденицы, при появлении на раннем дубе нежной вторичной листвы, дубовая широкоминирующая моль успешно её осваивает. Деревья дуба при этом испытывают более продолжительное и интенсивное повреждение листвы разных генераций, что сказывается на их текущем состоянии и дальнейшем развитии. Таким образом, при высокой плотности популяции зимней пяденицы она оказывает определенное давление на популяцию дубовой широкоминирующей моли, лишая её возможности питаться весенней листвой дуба ранней формы. Лёт бабочек дубовой широкоминирующей моли ежегодно продолжительный в течение всего летнего периода он проходит очень неравномерно в разных типах дубрав и существенно зависит от погодных условий. Ее высокая вредоносность сохраняется. Вспышка зимней пяденицы прекратилась после сильных морозов в январе феврале 2012 г. The brown oak slender Acrocercops brongniardella (F., 1798) (Lepidoptera, Gracillariidae) is a wellknown species of leaf miners that has been widely reproducing in oak forests of the European part of Russia, Ukraine, and Western European countries. In the past two decades, evidence of an increase in its abundance and population density in some regions has appeared. However, there are still gaps in knowledge on the development features of this species. According to some authors, the moth produces one generation per year, while other authors indicate two. This discrepancy may be due to different weather conditions in different habitats, or the change in conditions of the same habitat. With simultaneous mass reproduction of the brown oak slender and the winter moth Operophtera brumata (L., 1758) (Lepidoptera: Geometridae), the defoliation of the crowns of both phenological forms of the oak occurs differently, due to the fact that the primary foliage of the early form of the oak damaged by the winter moth, the brown oak slender does not colonize and begins to mine the leaves of the oak of the late and intermediate forms not damaged by the winter moth. This increases the level of defoliation. After pupation of the winter moth, when delicate secondary foliage appears on early oak, the brown oak slender successfully utilizes it. At this point, oak trees experience a more prolonged and intensive damage to the foliage of different generations, which affects their current state and further development. Thus, at a high density of the winter moth population, it exerts a certain pressure on the population of the brown oak slender, depriving it of the opportunity to feed on the spring foliage of the earlyshaped oak. The flight of the brown oak slender is annually long, during the whole summer, but it occurs very unevenly in different types of oak forests and significantly depends on the weather conditions. The damage caused by the brown oak slender is still high. The outbreak of the winter moth stopped after a severe frost in January February of 2012.


2019 ◽  
Vol 65 (No. 7) ◽  
pp. 247-255
Author(s):  
Ali Mahdavi ◽  
Azadeh Maleki ◽  
Masoud Bazgir

One of the important issues both in the political discussion about climate change and in forest ecosystem research is carbon sequestration. In this paper, we estimated soil carbon sequestration (SCS) in two Persian oak forest stands of different origin (seed and coppice). Soil samples were taken at two soil depths (0–15 and 15–30 cm) and locations (under the tree crown and open area) in each oak stand. Results showed that surface layers (0–15 cm) had the highest soil carbon sequestration ranging from 41.2 t·ha–1 to 47.9 t·ha–1 for both oak forests. The total SCS was higher (between 79.5 and 89.07 t·ha–1) in open areas of the two forest stands than under the crowns of oak trees. Finally, the amount of total SCS in seed originated forest (SOF) (86.52 t·ha–1) was significantly greater (P &lt; 0.05) than in coppice forest (CF) (77.70 t·ha–1). The results indicate that a relatively large proportion of C loss in CF is due to overgrazing, forest degradation and conversion to coppice forests in the study area.


2012 ◽  
Vol 58 (No. 3) ◽  
pp. 116-122 ◽  
Author(s):  
S. Khosravi ◽  
M. Namiranian ◽  
H. Ghazanfari ◽  
A. Shirvani

The focus of the present study is the estimation of leaf area index (LAI) and the assessment of allometric equations for predicting the leaf area of Lebanon oaks (Quercus libani Oliv.) in Iran&rsquo;s northern Zagros forests. To that end, 50 oak trees were randomly selected and their biophysical parameters were measured. Then, on the basis of destructive sampling of the oak trees, their specific leaf area (SLA) and leaf area were measured. The results showed that SLA and LAI of the Lebanon oaks were 136.9 cm&middot;g<sup>&ndash;1 </sup>and 1.99, respectively. Among all the parameters we measured, the crown volume exhibited the highest correlation with LAI (r<sup>2</sup> = 0.65). The easily measured tree parameters such as diameter at breast height did not show a high correlation with leaf area (r<sup>2</sup> = 0.36). Our obtained moderate correlations in the allometric equations could be due to the fact that branches of these trees had been pollarded by the local people when the branches were only 3 or 4 years old; therefore, the natural structure of the crowns in these trees might have been damaged. &nbsp;


2019 ◽  
Vol 11 (1) ◽  
pp. 43-57 ◽  
Author(s):  
Heydari Mehdi ◽  
Aazami Fatemeh ◽  
Faramarzi Marzban ◽  
Omidipour Reza ◽  
Bazgir Masoud ◽  
...  

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