نتایج جستجو برای: and plant cover

تعداد نتایج: 16893867  

2017
Florence Tardy Gaëlle Damour Marc Dorel Delphine Moreau

Cover plants can be introduced in cropping systems to provide agroecosystem services, including weed control via competition for resources. There is currently no consensus on how to identify the best cover plant species, while trait-based approaches are promising for screening plant species due to their agroecosystem service provision potential. This study was carried out to characterize soil e...

2006
THOMAS KOLLAR

We present a review of the literature on fast nearest neighbors using the basic approach from Karger and Ruhl [4] and a recent technique called cover trees. A small error in Insert procedure from the original paper on cover trees is corrected and an examination of how query time actually varies with the size of the problem is shown using a Python implementation of the basic cover tree algorithms.

خلیلی, فرزانه, روجائی, نعمت‌ اله, ملکیان, منصوره, همامی, محمودرضا,

The current study used habitat suitability index to evaluate habitat suitability of Servak forested area located near Yasouj for the Persian squirrel. Habitat variables including elevation, slope, aspect, density of vegetation cover, height of tree, tree diameter, canopy area of tree, distance to roads, distance to villages, and distance to rivers were used in this evaluation. Results showed th...

2016
Julia Tiede Bernd Wemheuer Michael Traugott Rolf Daniel Teja Tscharntke Anne Ebeling Christoph Scherber Ulrich Melcher

Plant diversity affects species richness and abundance of taxa at higher trophic levels. However, plant diversity effects on omnivores (feeding on multiple trophic levels) and their trophic and non-trophic interactions are not yet studied because appropriate methods were lacking. A promising approach is the DNA-based analysis of gut contents using next generation sequencing (NGS) technologies. ...

2008
G. V. Wilson K. C. McGregor D. Boykin

The year to year carry-over effects of biomass additions under different plant populations on runoff and erosion are unclear. The objective of this study was to quantify the impact of different plant populations on residue cover to elucidate the effects of residue cover on runoff and erosion. The residue management system involved shredding of corn (maize) biomass after harvest, incorporating t...

امیری, فاضل , خواجه الدین, سید جمال الدین , مختاری, کوشیار ,

Ordination is the part of statistical ecology which has developed and integrated in recent years. Finding environmental factors which important in ecological structure determination of plant species is the final purpose of ordination. Ordination method was used for finding the effect of important variables on Bromus tomentellus species quantitative and qualitative changes in Esfahan's Fereidan ...

2007
Mark J. Fields Debra P. Coffin James R. Gosz

Our objective was to evaluate the effects of burrowing activities by banner-tail kangaroo rats (Dipodornys spectabilis Merriam) on plant community structure and species dominance for two patch types at the ecotone between shortgrass steppe and desert grassland in New Mexico, USA. 10mounds produced by kangaroo rats were selected in patches dominated by Bo~ireloua gracilis (the dominant in shortg...

Journal: :علوم باغبانی ایران 0
نجمه زمانی دانشجوی سابق کارشناسی ارشد، دانشکدۀ کشاورزی، دانشگاه آزاد اسلامی واحد خوراسگان (اصفهان) نعمت اله اعتمادی دانشیار، دانشکدۀ کشاورزی، دانشگاه صنعتی اصفهان عبدالرحمان محمدخانی دانشیار، دانشکدۀ کشاورزی، دانشگاه شهرکرد

in recent years application of plant growth regulators especially growth retardants, has been significantly increased. trizols (paclobutrzol and trinexapac-ethyl) as the most effective and least harmful growth retardants, induce more dwarf and denser cover plants with both darker and thicker leaves.  therefore, an experiment based on completely randomized block design with 16 treatments and 3 r...

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