The effect of ecophysiography on the quantitative characteristics of DBH, height, basal area, crown diameter and canopy area of trees in mountain forest communities (Case study: Oak-hornbeam community in Arasbaran forest)

نویسندگان

چکیده مقاله:

Ecophysiography is the geography of the earth and the relationship between physiography and the ecosystem. Ecophysiography is a basis for planning processes to study the characteristics of terrestrial systems concerning the interactions between terrestrial physiography and living organisms. Due to the current state of ecosystems and the increase in natural disasters for ecosystem sustainability, the assessment of ecophysiographic features provides a basis for solving ecosystem problems to provide better ecosystem services. The environment has an important role in determining the affecting factors of the spread, distribution, and survival in forest communities. Therefore, the present study analyzed the relationship between the quantitative characteristics of trees and physiographic factors in slope aspects and elevation ranges. In this study, the data was prepared in six square sample plots with dimensions of 100 m ×100 m in oak and hornbeam-dominated stands in three altitude ranges from 1200 to 1600 meters above sea level and in two slopes aspects. The plots are selected from fully protected areas to minimize the effects of human degradation. The diameter at breast height, total height, and large and small diameters of the canopy of all trees were measured. The parameters of basal area (cm2), canopy area (m2), and average canopy diameter (m) of trees calculated in each sample plot. Statistical tests included analysis of variance and comparison of means performed by Tukey test at the significance level of 0.05 to investigate the effect of elevation and independent t-test to evaluate the effects of geographical aspects in R software. The results showed that the elevation and the slope aspects have not significantly affected the trees’ diameter and basal area (p>0.05), but there was a significant difference in tree height, average canopy diameter, and canopy area (p≤0.05). The northwest slope was more homogeneous in all the studied features, but the changes were more in the northeast slope. The height and canopy of trees from the valley to the peak increased significantly (p≤0.05). There was a significant correlation between the diameter and the basal area, and the canopy area and the average of the canopy diameter (p≤0.05). The study showed that the ecophysiographic factors (including elevation and slope aspect) affected some quantitative characteristics of oak-hornbeam stands in Arasbaran, and the trees had significant changes under the influence of these factors and due to the nature of the tendency to adapt to the environment.  The size of the trees in the top, slope, and valley in the northwest slope was homogeneous, and in the northeast slope from the valley to the top, the trees had larger sizes. This situation also existed for the basal area of trees. But in the northwest direction, they had a larger crown area in the slopes of the trees, and in the northeast direction, the peak trees had a larger crown area. These two regions did not have significant differences in crown characteristics. The trees in these two regions were similar in terms of crown dimensions.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

the effect of consciousness raising (c-r) on the reduction of translational errors: a case study

در دوره های آموزش ترجمه استادان بیشتر سعی دارند دانشجویان را با انواع متون آشنا سازند، درحالی که کمتر به خطاهای مکرر آنان در متن ترجمه شده می پردازند. اهمیت تحقیق حاضر مبنی بر ارتکاب مکرر خطاهای ترجمانی حتی بعد از گذراندن دوره های تخصصی ترجمه از سوی دانشجویان است. هدف از آن تاکید بر خطاهای رایج میان دانشجویان مترجمی و کاهش این خطاها با افزایش آگاهی و هوشیاری دانشجویان از بروز آنها است.از آنجا ک...

15 صفحه اول

the effect of traffic density on the accident externality from driving the case study of tehran

در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...

15 صفحه اول

the effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...

the washback effect of discretepoint vs. integrative tests on the retention of content in knowledge tests

در این پایان نامه تاثیر دو نوع تست جزیی نگر و کلی نگر بر به یادسپاری محتوا ارزیابی شده که نتایج نشان دهندهکارایی تستهای کلی نگر بیشتر از سایر آزمونها است

15 صفحه اول

the effect of e-64 on the developmental competence of sheep cocs during in vitro maturation

in the present study, the effect of e-64 at different concentrations (0.5, 1, 5 and 10 µm) added to (1) the ivm medium on oocyte nuclear maturation and developmental competence of ovine oocytes, and (2) to the ivc medium on embryonic development of ovine embryos were investigated.

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


عنوان ژورنال

دوره 10  شماره 21

صفحات  79- 92

تاریخ انتشار 2023-03

با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.

کلمات کلیدی

کلمات کلیدی برای این مقاله ارائه نشده است

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023