نتایج جستجو برای: phenological charactristics

تعداد نتایج: 4074  

Journal: :Global change biology 2014
Heather M Kharouba Sebastien R Paquette Jeremy T Kerr Mark Vellend

Studies to date have documented substantial variation among species in the degree to which phenology responds to temperature and shifts over time, but we have a limited understanding of the causes of such variation. Here, we use a spatially and temporally extensive data set (ca. 48 000 observations from across Canada) to evaluate the utility of museum collection records in detecting broad-scale...

This study aimed to evaluate effects of elevation and phenological stage on essential oil components of Teucrium polium L. and Teucrium orientale L. belonging to the Lamiaceae family. The aerial parts of the grown plants in two ranges of elevation including 2000-2500 and 2500-3000 m above sea level were harvested at three time-points, including end of vegetative, flowering, and seed filling sta...

Hamid Niknahad Gharmakher, Mashad Gholi Maramaei Masoumeh Ahmadi Beni Mojgan Sadat Azimi

Abstract. Information on forage quality in phenological stage could help range managers to choose suitable grazing method to achieve higher animal performance without detriment to vegetation. Vetiver grass (Vetiveria zizanioides) is a non-native perennial grass that was introduced to the Iran in 2008. This plant is a multi use species that could be considered from different viewpoints. Thus, it...

عاملی, حسین, فیضی, زهره, محمودی, محمود , حاجی کاظمی, فتخار السادات,

This is a discriptive study with the main goal to identify personal, pregnancy and delivery characteristics of mothers given birth to mentally retarded child. This study has been conducted in the rehabilitation center in Tehran in 1994. A total of 150 women took part in this research, and the tool of was a check list which was completed by researcher through interview. The findings were illustr...

2018
Francesco Giunta Pasquale De Vita Anna M. Mastrangelo Gavino Sanna Rosella Motzo

Phenology has a profound effect on adaptation and productivity of crops. The impact of phenology on tillering and fertility traits of durum wheat (Triticum turgidum L. subsp. durum Desf.) was evaluated with the aim of specifying which group of flowering genes (Vrn, Ppd, or eps) was involved in their control. A recombinant inbred line population was grown under four contrasting conditions of ver...

Journal: :Ecology 2008
Eric S Post Christian Pedersen Christopher C Wilmers Mads C Forchhammer

Climatic warming is associated with organisms breeding earlier in the season than is typical for their species. In some species, however, response to warming is more complex than a simple advance in the timing of all life history events preceding reproduction. Disparities in the extent to which different components of the reproductive phenology of organisms vary with climatic warming indicate t...

Journal: :Remote Sensing 2018
Deli Zhai Jinwei Dong Georg Cadisch Mingcheng Wang Weili Kou Jianchu Xu Xiangming Xiao Sawaid Abbas

The increasing expansion of rubber plantations throughout East and Southeast Asia urgently requires improved methods for effective mapping and monitoring. The phenological information from rubber plantations was found effective in rubber mapping. Previous studies have mostly applied rule-pixel-based phenology approaches for rubber plantations mapping, which might result in broken patches in fra...

Determination of forage quality of plant species in natural habitats such as rangelands and deserts is one of the most important factors for grazing management of these ecosystems. For this purpose, the nutritional values of Calligonum comosum in three phenological stages (vegetative growth, flowering, and seedling) were determined in desert habitats located in the northeast of Kashan, Iran (in...

Journal: :فصلنامه علمی پژوهشی علوم سیاسی 0
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mohaghegh-esabzevarididthemostseriouscontemplations over political life in the safavid era, discussing various political systems from a pragmatic view point. social life, law, just ruler, the objectives of state, utopian political system, defective political system, the charactristics of ruling system, the types of social classes and guilds, the organization of state, emphasis on the asceticism...

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