نتایج جستجو برای: shrubs

تعداد نتایج: 3863  

2010
Freddy Mora Sandra Perret Carlos Alberto Scapim Emmanuel Arnhold

F. Mora, S. Perret, C.A. Scapim, and E. Arnhold. 2010. Genetic parameters for growth and survival in Acacia saligna shrubs. Cien. Inv. Agr. 37(2):5-14. Acacia species have valuable agronomic characteristics, such as the tolerance to unfavorable environmental conditions. In this study, genetic parameters and selection response in Acacia saligna shrubs were investigated in two arid environments o...

Journal: :Global change biology 2017
James S Camac Richard J Williams Carl-Henrik Wahren Ary A Hoffmann Peter A Vesk

Climate change is expected to increase fire activity and woody plant encroachment in arctic and alpine landscapes. However, the extent to which these increases interact to affect the structure, function and composition of alpine ecosystems is largely unknown. Here we use field surveys and experimental manipulations to examine how warming and fire affect recruitment, seedling growth and seedling...

Journal: :اکو هیدرولوژی 0
خدیجه بهلکه دانشجوی کارشناسی ارشد، گروه مرتع داری، دانشکدۀ منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران مهدی عابدی استادیار گروه مرتع داری، دانشکدۀ منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران قاسمعلی دیانتی تیلکی دانشیار گروه مرتع داری، دانشکدۀ منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران

cushions as dominant species of mountainous habitats facilitate surrounding species. the aim of this study is the investigation of fire on onobrychiscornutamicrohabitats in the mountainous grasslands. fire occurredin summer 2013. therefore, in order to study the temperature fluctuations, thermometers were established under burned and unburned patches since 15 march 2016 for 31 days (half hours ...

Journal: :Remote Sensing 2016
Johannes Schreyer Tobia Lakes

Vegetation provides important functions and services in urban areas, and vegetation heights divided into vertical and horizontal units can be used as indicators for its assessment. Conversely, detailed area-wide and updated height information is frequently missing for most urban areas. This study sought to assess three vegetation height classes from a globally available TanDEM-X digital elevati...

Journal: :The New phytologist 2007
Mariah S Carbone Susan E Trumbore

Quantification of the fate of carbon (C) used by plant metabolism is necessary to improve predictions of terrestrial ecosystem respiration and its sources. Here, a dual isotope ((13)C and (14)C) pulse-label was used to determine the allocation of new C to different respiratory pathways in the early and late growing seasons for two plant functional types, perennial grasses and shrubs, in the Owe...

2015
Li-Na Xie Hong-Yu Guo Christopher A. Gabler Qing-Fang Li Cheng-Cang Ma

Few studies have investigated the influence of water availability on plant population spatial patterns. We studied changes in the spatial patterns of Caragana stenophylla along a climatic drought gradient within the Inner Mongolian Plateau, China. We examined spatial patterns, seed density, "nurse effects" of shrubs on seedlings, transpiration rates and water use efficiency (WUE) of C. stenophy...

2015
Andrea Ganthaler Stefan Mayr

Vaccinium myrtillus and Vaccinium vitis-idaea are two dwarf shrubs widespread in the European Alps. We studied the hydraulics of these species hypothesizing that (1) the hydraulic architecture of dwarf shrubs differs from trees, (2) hydraulic properties reflect the species' ecological amplitude and (3) hydraulic properties vary spatially and seasonally. Key hydraulic parameters (osmotic potenti...

2002
P. D. PRATT R. ROSETTA B. A. CROFT

The predatory mite Neoseiulus fallacis (Garman) was evaluated as a biological control agent of herbivorous mites on outdoor-grown ornamental landscape plants. To elucidate factors that may affect predator efÞciency, replicated tests were conducted on 30 ornamental plant cultivars that varied in relationship to their generalized morphology (e.g., conifers, shade trees, evergreen shrubs, deciduou...

2015
Christine Sambles Alexandra Schlenzig Paul O'Neill Murray Grant David J. Studholme

Newly discovered Phytophthora species include invasive pathogens that threaten trees and shrubs. We present draft genome assemblies for three isolates of Phytophthora kernoviae and one isolate of the EU2 lineage of Phytophthora ramorum, collected from outbreak sites in Scotland.

2007
Aina Pihlgren Tommy Lennartsson

Vegetation composition and reproduction of vascular plants were studied in relation to seven spatial structures: Betula pendula, Pinus sylvestris, Juniperus communis, Rosa dumalis, dung pats, grazing rejects and grazed patches. Th e study was performed in 14 unfertilized semi-natural pastures, with diff erent grazing intensities, in southcentral Sweden. Vegetation height diff ered between sites...

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