نتایج جستجو برای: seedling biomass

تعداد نتایج: 76895  

2011
Yang Li Haijun Yang Jianyang Xia Wenhao Zhang Shiqiang Wan Linghao Li

BACKGROUND The responses of plant seeds and seedlings to changing atmospheric nitrogen (N) deposition and precipitation regimes determine plant population dynamics and community composition under global change. METHODOLOGY/PRINCIPAL FINDINGS In a temperate steppe in northern China, seeds of P. tanacetifolia were collected from a field-based experiment with N addition and increased precipitati...

2011
Courtney L J Rowe Elizabeth A Leger

Widespread invasion by Bromus tectorum (cheatgrass) in the Intermountain West has drastically altered native plant communities. We investigated whether Elymus multisetus (big squirreltail) is evolving in response to invasion and what traits contribute to increased performance. Seedlings from invaded areas exhibited significantly greater tolerance to B. tectorum competition and a greater ability...

Journal: :Annals of botany 2009
M E Hanley R J Sykes

BACKGROUND AND AIMS Although the causes and consequences of seedling herbivory for plant community composition are well understood, the mechanisms by which herbivores influence plant species recruitment to the established phase remain less clear. The aim was to examine how variation in the intensity of seedling herbivory interacts with growth-defence trade-offs and herbivore feeding preferences...

2010
R. A. PROGAR G. MARKIN J. MILAN T. BARBOULETOS M. J. RINELLA

Inundative releases of beneÞcial insects are frequently used to suppress pest insects but not commonly attempted as amethod of weed biological control because of the difÞculty in obtaining the required large numbers of insects. The successful establishment of a ßea beetle complex, mixed Aphthona lacertosa (Rosenhauer) and Aphthona nigriscutus Foundras (87 and 13%, respectively), for the control...

Journal: :The New phytologist 2015
Brian J Pickles Brendan D Twieg Gregory A O'Neill William W Mohn Suzanne W Simard

Separating edaphic impacts on tree distributions from those of climate and geography is notoriously difficult. Aboveground and belowground factors play important roles, and determining their relative contribution to tree success will greatly assist in refining predictive models and forestry strategies in a changing climate. In a common glasshouse, seedlings of interior Douglas-fir (Pseudotsuga ...

2016
Antonio Montagnoli Mattia Terzaghi Nicoletta Fulgaro Borys Stoew Jan Wipenmyr Dag Ilver Cristina Rusu Gabriella S. Scippa Donato Chiatante

A plant phenotyping approach was applied to evaluate growth rate of containerized tree seedlings during the precultivation phase following seed germination. A simple and affordable stereo optical system was used to collect stereoscopic red-green-blue (RGB) images of seedlings at regular intervals of time. Comparative analysis of these images by means of a newly developed software enabled us to ...

Journal: :تولید گیاهان زراعی 0

geostatistical techniques were used to describe the spatial distribution of weeds, under conventional management conditions and theirs effect on wheat biomass production over the course of one growing season (2008-2009), in a wheat (triticum aestivum l.) field at research station of shahrood university, iran. weeds seedling were identified and counted at 121 points of field based on two interva...

Journal: :Journal of economic entomology 2010
R A Progar G Markin J Milan T Barbouletos M J Rinella

Inundative releases of beneficial insects are frequently used to suppress pest insects but not commonly attempted as a method of weed biological control because of the difficulty in obtaining the required large numbers of insects. The successful establishment of a flea beetle complex, mixed Aphthona lacertosa (Rosenhauer) and Aphthona nigriscutus Foundras (87 and 13%, respectively), for the con...

2016
Luciana Cristina Vitorino Layara Alexandre Bessa Ligia Guimarães Carvalho Fabiano Guimarães Silva

Eucalyptus cultivation has expanded considerably in Brazilian systems, leading to the current search for technologies to optimize growing conditions and the production of seedlings in nurseries. Based on the understanding that the development of tree species such as Eucalyptus sp. can be influenced by endophytic fungi that act directly as plant growth-promoting species, cloned seedlings of Euca...

2004
Margaret C. Cirtain Scott B. Franklin S. Reza Pezeshki

1 Corresponding author: [email protected]; (901) 678-1502; fax: (901) 678-4746 ABSTRACT: A greater than 98% decline in Arundinaria gigantea (Walt.) Muhl. (giant cane or river cane) canebrake communities have resulted in a critically endangered ecosystem. Historical accounts suggest loss of canebrake habitat has resulted in the extirpation (and perhaps extinction) of many species. Thus, caneb...

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