نتایج جستجو برای: mixed and natural stands

تعداد نتایج: 16917246  

Journal: :Biodiversitas Journal of Biological Diversity 2015

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده علوم تربیتی و روانشناسی 1388

چکیده هدف اصلی این پژوهش تعیین رابطه استراتژیهای خود رهبری و خلاقیت اعضای هیات علمی دانشگاه علم و صنعت بوده است. در این پژوهش از روش توصیفی از نوع همبستگی استفاده شده است. جامعه آماری پژوهش کلیه اعضای هیات علمی دانشگاه علم و صنعت در سال تحصیلی 88-1387 بود که بالغ بر345 نفربودندو از این تعداد، 119 نفر استاد با استفاده از روش نمونه گیری تصادفی طبقه ای متناسب با حجم انتخاب شد. ابزار جمع آوری داده...

2008
Miguel Navascués Brent C. Emerson

15 The endemic pine, Pinus canariensis, forms one of the main forest ecosystems in the 16 Canary Islands. In this archipelago, pine forest is a mosaic of natural stands (remnants 17 of past forest overexploitation) and artificial stands planted from the 1940’s. The 18 genetic makeup of the artificially regenerated forest is of some concern. The use of 19 reproductive material with uncontrolled ...

2001
PETER B. REICH PETER BAKKEN DAREN CARLSON LEE E. FRELICH STEVE K. FRIEDMAN DAVID F. GRIGAL

The effects of logging on ecosystem sustainability are controversial. Surprisingly, existing data are inadequate to allow a comprehensive evaluation of logging effects on biodiversity, composition, and productivity since appropriate comparisons of stands of similar ages and differing disturbance histories are rare. We addressed this issue using a study of 2000 plots in 80 southern boreal forest...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده ادبیات و علوم انسانی 1391

the purpose of this two-phase, sequential mixed methods study was to find out whether there were any decencies between male and female ma students’ theses regarding the common features of academic writing such as syntactic complexity, means of integrating cited information, and organizing arguments. i chose 10 male written theses and 15 female written theses in tefl and linguistics. in the firs...

ارومیه ای, نادیا, سیف الدینی, رستم, مهرالحسنی, محمد حسین, میرزایی, سعید, یزدی فیض آبادی, وحید,

Background and Objectives: Different governance approaches have various definitions and systems about health. The purpose of this study was to compare the appropriateness of the health system performance with the ideology of the selected countries. Methods: In this comparative study, liberal countries (America, Canada, France), social countries (Russia, China, Cuba) and mixed countries (Sweden...

Journal: :Metsanduslikud Uurimused 2022

Abstract During land unsoldering in Ukraine, so-called “self-seeded forests” appeared on lands that had not been used for agriculture a long time. The purpose of the research is to find out erosion control properties self-seeded forests. Twelve locations natural regeneration various types woody plants ravine-gully system Cherkasy region were chosen as sites. Self-seeded woods have structure dif...

Journal: :Forests 2021

This study presents the biometric relationships among various increments that is useful in both scientific and practical terms for silvicultural of silver fir. The recorded characteristics trees are a faithful indicator effect work measures environmental conditions. Knowing these increments, them, can contribute to adaptations on stands with purpose reducing risks generated by factors. We carri...

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