نتایج جستجو برای: trees
تعداد نتایج: 90009 فیلتر نتایج به سال:
Allergy is becoming a major disease burden globally. Pollens are considered as the main component of aeroallergens that lead to rhinitis and asthma. Due to the lack of a comprehensive investigation on most allergic pollens of trees in the Middle East, the present study aimed to conduct a comprehensive literature review on this topic. The main goal of the study was to provide a checklist for all...
Oak decline is an eminent factor, which has a significant role in degradation and change in Zagros forests. The goal of present study was to assess the crown surface area of oak trees in Sarableh forests, Ilam province. For this purpose, permanent sample plots were used. Eighty sample plots with 10 Ar area were applied based on systematic-random method in a 150×200 survey network in 120 ha. The...
In this study 30 coppice oak trees(Quercus brantii Lindl.) with least diameter of 5 centimeteres were chosen with random classification. Characteristics such as the number of sprouts, the diameter, total height, and the large and small diameter of crown were measured. For this purpose, the diameter ranges of the oak trees were devided into 5 cm classes and at least the growth factors of 3 trees...
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