the study of drought effects on poplar tree ring growth in the soome-e-sara township - guilan

نویسندگان

بهمن رمضانی گورابی

فرزاد شیرزاد

چکیده

decreasing changes of climatic elements such as: daily precipitation, weekly precipitation, seasonal precipitation and annual precipitation can be toward to drought phenomena. the recognition it and planning for passing it, could be decreasing of disasters, because create of drought is slow but it effects is very damages. the aim of this paper is descriptive analyze and it type of research is applied research with uses of filed work and obtains of tree ring desk and comparison precipitation in statistical at study time (1995-2003) in soome-e-sara of gilan province by a research project. result of this paper has shown that drought or deficit of rain has been direct relationship with growth tree ring index (tri). diameter increment in (populus deltoids) poplar-trees and relationship between annual precipitation and annual tree ring index has been with correlation r=0.662 (a=5%), but without view of year happen this correlation is r=0.88. changing of decreasing precipitation from 1200 millimeter to 800 millimeter (drought) accompanying has been with 2.3 millimeter decreasing of tree ring indexed in the time of study period. this factor has been accompanying with high destroy in area. increasing of studying and look at to suggestion ways of this paper could be benefits.

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 effects of changing roughness on the flow structure in the bends

flow in natural river bends is a complex and turbulent phenomenon which affects the scour and sedimentations and causes an irregular bed topography on the bed. for the reason, the flow hydralics and the parameters which affect the flow to be studied and understand. in this study the effect of bed and wall roughness using the software fluent discussed in a sharp 90-degree flume bend with 40.3cm ...

the impact of e-readiness on ec success in public sector in iran the impact of e-readiness on ec success in public sector in iran

acknowledge the importance of e-commerce to their countries and to survival of their businesses and in creating and encouraging an atmosphere for the wide adoption and success of e-commerce in the long term. the investment for implementing e-commerce in the public sector is one of the areas which is focused in government‘s action plan for cross-disciplinary it development and e-readiness in go...

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.

environmental effects of gol-e-gohar iron ore mine on groundwater of the area

gol-e-gohar iron ore mine of sirjan in southern part of iran is a large open pit that operates below the groundwater table and during mining operation, dewatering is required to prevent operation processes from flooding. current operation is going on by digging wells in or out of the pit and pumping to prevent flooding. as a result of the former dewatering operation a vast deep cone of depressi...

on the effects of pictorial clues on the efl learners listening comprehension development

the following null hypothesis was proposed: there is no significant difference between the efl students listening comprehension development receiving pictorial cues and those receiving no cuse. to test the null hypothesis, 52 male and femal freshmen students of medicine studing at iran university of medical scinces were randomly selected from a total population of 72 students. to ensure that th...

15 صفحه اول

منابع من

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


عنوان ژورنال:
پژوهش های جغرافیای طبیعی

جلد ۴۱، شماره ۶۷، صفحات ۰-۰

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023