Results 11 to 20 of about 107,823 (286)

Modelling of Evenness of Runways as an Element of Sustainable Airport Maintenance

open access: yesApplied Sciences, 2021
The elevation of airport runways is specified in the operations manuals and in globally accepted design guidelines. Airport runways are constantly exposed to various physical and weather factors.
Drago Sever   +2 more
doaj   +1 more source

Investigating the effects of distribution patterns on ecological indices of plant species in a simulated environment [PDF]

open access: yesDesert, 2020
Species diversity is a combination of species richness with species evenness. It helps us differentiate between communities or areas that have the same number of different species, but not in the same abundance.
N. Fakhar Izadi, H.R. Keshtkar
doaj   +1 more source

Finding even subgraphs even faster [PDF]

open access: yesJournal of Computer and System Sciences, 2018
Problems of the following kind have been the focus of much recent research in the realm of parameterized complexity: Given an input graph (digraph) on $n$ vertices and a positive integer parameter $k$, find if there exist $k$ edges (arcs) whose deletion results in a graph that satisfies some specified parity constraints.
Prachi Goyal   +4 more
openaire   +7 more sources

Comparative Study of Carbon Stock and Tree Diversity between Scientifically and Conventionally Managed Community Forests of Kanchanpur District, Nepal

open access: yesEnvironment and Natural Resources Journal, 2022
The present study was accomplished to assess and compare tree diversity, carbon stock, and to find the relationship between carbon stock and tree diversity in scientifically and conventionally managed community forests (CFs) of Kanchanpur District, Nepal.
Keshav Ayer   +4 more
doaj   +1 more source

Trends in Varietal Diversity of Main Staple Crops in Asia and Africa and Implications for Sustainable Food Systems

open access: yesFrontiers in Sustainable Food Systems, 2021
Crop species and varietal diversity on farm have the potential to trigger multiple regulating and provisioning ecosystem services. The latter is commonly assessed through targeted studies covering a select number of geographies and crop species ...
Marcel Gatto   +5 more
doaj   +1 more source

Exclosure effects on soil physicochemical properties and woody species diversity in the south Rift valley basin of Ethiopia

open access: yesEnvironmental Research Communications, 2023
Establishing exclosures has become common rehabilitation and restoration of degraded lands in Ethiopia. This study examined the effects of exclosure on identified soil physical and chemical properties, and woody diversity at the Wamole sub-watershed ...
Markos Mathewos, Zelalem Mamo
doaj   +1 more source

Weed Community Composition in Simple and More Diverse Cropping Systems

open access: yesFrontiers in Agronomy, 2022
Weed communities in three cropping systems suitable for the Midwestern USA were studied from 2017 to 2020 to examine how crop diversification and the intensity of herbicide use affected weed community diversity, stand density, and aboveground mass.
Huong T. X. Nguyen, Matt Liebman
doaj   +1 more source

Komunitas Moluska pada Berbagai Kondisi Mangrove di Segara Anakan, Cilacap-Jawa Tengah

open access: yesJurnal Kelautan Tropis, 2022
The mangrove forest in Segara Anakan lagoon continues to decrease from land conversion or sedimentation. It could have an impact on the diversity of molluscs. This study aims to inventory the diversity and the patterns of mangrove molluscs communities in
Nova Mujiono, Nur Rohmatin Isnaningsih
doaj   +1 more source

Phytoplankton assemblage characteristics in recurrently fluctuating environments [PDF]

open access: yes, 2015
Annual variations in biogeochemical and physical processes can lead to nutrient variability and seasonal patterns in phytoplankton productivity and assemblage structure.
Roelke, Daniel L., Spatharis, Sofie
core   +7 more sources

Vulnerability of Soil Microbiome to Monocropping of Medicinal and Aromatic Plants and Its Restoration Through Intercropping and Organic Amendments

open access: yesFrontiers in Microbiology, 2019
Cultivation of medicinal and aromatic plants (MAPs) is persistently increasing due to excessive demands of naturals. Agricultural land and its microbial diversity are primarily adapted to conventional crops, and introduction of MAP and their continuous ...
Pooja Misra   +10 more
doaj   +1 more source

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