نتایج جستجو برای: after determining vegetation types and associated species
تعداد نتایج: 17320248 فیلتر نتایج به سال:
The subject of outdoor thermal comfort has been researched since 1970. Due to its differences with indoor thermal comfort, it must be assessed with the proper indices. Also, the outdoor thermal comfort of each geographical region must be assessed independently. This research aims to study the measurement indices of outdoor thermal comfort and subsequently determine the most relevant index to as...
Insects are key components of urban ecological networks and are greatly impacted by anthropogenic activities. Yet, few studies have examined how insect functional groups respond to changes to urban vegetation associated with different management actions. We investigated the response of herbivorous and predatory heteropteran bugs to differences in vegetation structure and diversity in golf cours...
distribution and abundance of plants has been correlated with a variety of complex environmental gradients. environmental factors affect plants growth and need to be understood by ecosystem managers. this study was carried out to examine the relationships between site factors and different vascular and non-vascular plants in north of iran. for this purpose, vegetation and soil sampling was perf...
Forest fire is the major disturbance that can severely destruct genetic stocks and delays evolution of the forest to reach the climax stage. In this research, the effect of fire, vegetation and soil changes from 2002 to 2013 have studied. Following the steps of determining the scope of fire using GPS, preparing a homogeneous unit map in ArcMap software and implementing a systematic random-acces...
Climate change due to increasing the level of greenhouse gases including CO2 is the main environmental issue of the world in the new century. One of the effective way for reducing atmospheric CO2 is carbon sequestration by plants and soils. A vast area of Iran has desert condition with special adapted plant species in which can be devoted for carbon sequestration. Hammada salicornica as a shrub...
Of the 110 000 to 180 000 hectares per year on which prescribed burning has recently been conducted in Canada, 70 000 to 150 000 hectares per year (mostly in British Columbia) has been burned for vegetation management purposes. Such purposes include silviculture, control of plant parasites, promotion of desirable plant species, and conservation of natural ecosystems. The emphasis of prescribed ...
the aim of the present study was to investigate the frequency and the type of discourse markers used in the argumentative and expository writings of iranian efl learners and the differences between these text features in the two essay genres. the study also aimed at examining the influence of the use of discourse markers on the participants’ writing quality. to this end the discourse markers us...
hedging is a multi-purpose rhetorical strategy which is usually used in scientific arguments to secure ratification of claims, reduce the risk of negation, avoid conflict, manage disagreement and leave room for the audience to assess presented information. hedges are frequently used in research articles to mitigate the findings of research endeavors. the present research aims to investigate the...
this ethnographic case study research was carried out in a private school setting in the context of iran. the research tried to explore the analysis and identity construction of a group of learners and teachers along with the content analysis of books on the basis of four types of commodified, political, national and narrative identities. how english language learners and teachers in an informa...
Determination of factors affecting on species distribution and diversity, especially in desert areas is the most important factor in rangeland ecosystems management for encountering biological stress. In order to evaluate the effect of physiographic factors on plant biodiversity in natural ecosystems of Kakhk Gonabad, this research was conducted in spring 2014. First, by overlaying four maps of...
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