نتایج جستجو برای: forty plots were established
تعداد نتایج: 3689276 فیلتر نتایج به سال:
Assessment and monitoring of rangeland in different grazing managements seems necessary to manage rangelands. The plant functional groups can be used as appropriate responders for rangelands condition and management. Therefore, this study was performed and aimed to determine the most important traits that are influenced by rangeland variation and management. In order to this, three areas along ...
Background and objectives: Determining the minimum number of samples and the minimum parameters to be measured that provide acceptable results is one of the most basic decisions that rangeland scientists need to make. Methods for determining the number of samples in rangeland vegetation measurements are different. graphical methods and statistical characteristics are the most common methods by...
abstract the primary purpose of this study was to explore the actual practices and cognitions of two groups of iranian eap teachers, i.e. language teachers and content teachers, with respect to teaching reading-comprehension and vocabulary. to this end, tehran university of medical sciences which authorizes both groups of teachers to teach eap courses was selected as the context of the study s...
The degree to which changes in community composition mediate the probability of colonization and spread of non-native species is not well understood, especially in animal communities. High species richness may hinder the establishment of non-native species. Distinguishing between this scenario and cases in which non-native species become established in intact (lacking extensive anthropogenic so...
Proper judgement on rangeland state needs appropriate sampling plan and accurately estimation of plant characteristics. Sample shape and size are critical issues in vegetation measurement. Thus, decision on appropriate quadrate shape that enables us to determine several parameters accurately and timely would increase sampling efficiency. Several criterias including accuracy, perimeter/area rati...
The aim of this study was to assess the regional effects of fire on the surface cover and forage production of mountainous rangelands of Delfan County, Lorestan province, Iran. The fire took placed in June 2007 with significant effects on the vegetation characteristics in the study area. Four fire affected sites were selected for sampling and a close area without fire was considered as control....
impact of sex pheromones, stirrup-m as additive for acaricides effects were evaluated on panonycjllls lllmi in 1995-1997. peroral (azocyclotin), amitraz (mitac), omite (propargite), neoron (bromopropylate) and citrazon (benzoximate) were tested with and without pheromones and compared with untreated plots with four replications through randomized complete block design. mortality percentage of e...
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