keyword
MENU ▼
Read by QxMD icon Read
search

Canopy

keyword
https://www.readbyqxmd.com/read/28541561/effects-of-rainfall-exclusion-on-leaf-gas-exchange-traits-and-osmotic-adjustment-in-mature-canopy-trees-of-dryobalanops-aromatica-dipterocarpaceae-in-a-malaysian-tropical-rain-forest
#1
Yuta Inoue, Tomoaki Ichie, Tanaka Kenzo, Aogu Yoneyama, Tomo'omi Kumagai, Tohru Nakashizuka
Climate change exposes vegetation to unusual levels of drought, risking a decline in productivity and an increase in mortality. It still remains unclear how trees and forests respond to such unusual drought, particularly Southeast Asian tropical rain forests. To understand leaf ecophysiological responses of tropical rain forest trees to soil drying, a rainfall exclusion experiment was conducted on mature canopy trees of Dryobalanops aromatica Gaertn.f. (Dipterocarpaceae) for 4 months in an aseasonal tropical rain forest in Sarawak, Malaysia...
May 24, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28536585/exploring-niches-for-short-season-grain-legumes-in-semi-arid-eastern-kenya-coping-with-the-impacts-of-climate-variability
#2
Anne Sennhenn, Donald M G Njarui, Brigitte L Maass, Anthony M Whitbread
Climate variability is the major risk to agricultural production in semi-arid agroecosystems and the key challenge to sustain farm livelihoods for the 500 million people who inhabit these areas worldwide. Short-season grain legumes have great potential to address this challenge and help to design more resilient and productive farming systems. However, grain legumes display a great diversity and differ widely in growth, development, and resource use efficiency. Three contrasting short season grain legumes common bean (Phaseolus vulgaris L...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28536581/optimization-of-nitrogen-rate-and-planting-density-for-improving-yield-nitrogen-use-efficiency-and-lodging-resistance-in-oilseed-rape
#3
Shahbaz Khan, Sumera Anwar, Jie Kuai, Sana Ullah, Shah Fahad, Guangsheng Zhou
Yield and lodging related traits are essential for improving rapeseed production. The objective of the present study was to investigate the influence of plant density (D) and nitrogen (N) rates on morphological and physiological traits related to yield and lodging in rapeseed. We evaluated Huayouza 9 for two consecutive growing seasons (2014-2016) under three plant densities (LD, 10 plants m(-2); MD, 30 plants m(-2); HD, 60 plants m(-2)) and four N rates (0, 60, 120, and 180 kg ha(-1)). Experiment was laid out in split plot design using density as a main factor and N as sub-plot factor with three replications each...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28531303/varietal-preferences-and-within-orchard-and-tree-distribution-of-newly-recorded-gall-midges-dasineura-amaramanjarae-and-procontarinia-mangiferae-diptera-cecidomyiidae-from-commercial-mango-cultivars-in-pakistan
#4
H M Rehman, R Mahmood, M Razaq, R Saeed, M Jamil, G V P Reddy
Gall midges (Diptera: Cecidomyiidae) damage mango by feeding on flowers and fruit tissues, inducing galls on leaves, and providing inoculums of anthracnose. Dasineura amaramanjarae Grover and Procontarinia mangiferae (Felt), two gall midges that damage flowers in all mango-growing areas of the world, have recently been recorded in Pakistan, and studies were conducted in 2011 and 2012 on the within-tree and orchard distribution patterns and cultivar preference of both species in Pakistan at one location (Rahim Yar Khan)...
May 22, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28527740/reductions-of-plant-cover-induced-by-sheep-grazing-change-the-above-belowground-partition-and-chemistry-of-organic-c-stocks-in-arid-rangelands-of-patagonian-monte-argentina
#5
C Larreguy, A L Carrera, M B Bertiller
The objective of this study was to estimate the size and chemical quality of the total organic C stock and its partition between above-belowground plant parts and soil at sites with different plant cover induced by sheep grazing in the arid Patagonian Monte. This study was conducted at six representative sites with increasing signs of canopy disturbance attributed to grazing pressure. We used faeces density as a proxy of grazing pressure at each site. We assessed the total plant cover, shrub and perennial grass cover, total standing aboveground biomass (AGB), litter mass and belowground biomass (BGB) at each site...
May 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28525940/spray-pesticide-applications-in-mediterranean-citrus-orchards-canopy-deposition-and-off-target-losses
#6
Cruz Garcerá, Enrique Moltó, Patricia Chueca
Only a portion of the water volume sprayed is deposited on the target when applying plant protection products with air-assisted axial-fan airblast sprayers in high growing crops. A fraction of the off-target losses deposits on the ground, but droplets also drift away from the site. This work aimed at assessing the spray distribution to different compartments (tree canopy, ground and air) during pesticide applications in a Mediterranean citrus orchard. Standard cone nozzles (Teejet D3 DC35) and venturi drift reducing nozzles (Albuz TVI 80 03) were compared...
May 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28520726/losing-a-jewel-rapid-declines-in-myanmar-s-intact-forests-from-2002-2014
#7
Tejas Bhagwat, Andrea Hess, Ned Horning, Thiri Khaing, Zaw Min Thein, Kyaw Moe Aung, Kyaw Htet Aung, Paing Phyo, Ye Lin Tun, Aung Htat Oo, Anthony Neil, Win Myo Thu, Melissa Songer, Katherine LaJeunesse Connette, Asja Bernd, Qiongyu Huang, Grant Connette, Peter Leimgruber
New and rapid political and economic changes in Myanmar are increasing the pressures on the country's forests. Yet, little is known about the past and current condition of these forests and how fast they are declining. We mapped forest cover in Myanmar through a consortium of international organizations and environmental non-governmental groups, using freely-available public domain data and open source software tools. We used Landsat satellite imagery to assess the condition and spatial distribution of Myanmar's intact and degraded forests with special focus on changes in intact forest between 2002 and 2014...
2017: PloS One
https://www.readbyqxmd.com/read/28518067/remote-sensing-evaluation-of-two-spotted-spider-mite-damage-on-greenhouse-cotton
#8
Daniel E Martin, Mohamed A Latheef
The objective of this study was to evaluate a ground-based multispectral optical sensor as a remote sensing tool to assess foliar damage caused by the two-spotted spider mite (TSSM), Tetranychus urticae Koch, on greenhouse grown cotton. TSSM is a polyphagous pest which occurs on a variety of field and horticultural crops. It often becomes an early season pest of cotton in damaging proportions as opposed to being a late season innocuous pest in the mid-southern United States. Evaluation of acaricides is important for maintaining the efficacy of and preventing resistance to the currently available arsenal of chemicals and newly developed control agents...
April 28, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28516905/the-effects-of-forest-canopy-shading-and-turbulence-on-boundary-layer-ozone
#9
P A Makar, R M Staebler, A Akingunola, J Zhang, C McLinden, S K Kharol, B Pabla, P Cheung, Q Zheng
The chemistry of the Earth's atmosphere close to the surface is known to be strongly influenced by vegetation. However, two critical aspects of the forest environment have been neglected in the description of the large-scale influence of forests on air pollution: the reduction of photolysis reaction rates and the modification of vertical transport due to the presence of foliage. Here we show that foliage shading and foliage-modified vertical diffusion have a profound influence on atmospheric chemistry, both at the Earth's surface and extending throughout the atmospheric boundary layer...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28512461/transcriptional-responses-to-pre-flowering-leaf-defoliation-in-grapevine-berry-from-different-growing-sites-years-and-genotypes
#10
Sara Zenoni, Silvia Dal Santo, Giovanni B Tornielli, Erica D'Incà, Ilaria Filippetti, Chiara Pastore, Gianluca Allegro, Oriana Silvestroni, Vania Lanari, Antonino Pisciotta, Rosario Di Lorenzo, Alberto Palliotti, Sergio Tombesi, Matteo Gatti, Stefano Poni
Leaf removal is a grapevine canopy management technique widely used to modify the source-sink balance and/or microclimate around berry clusters to optimize fruit composition. In general, the removal of basal leaves before flowering reduces fruit set, hence achieving looser clusters, and improves grape composition since yield is generally curtailed more than proportionally to leaf area itself. Albeit responses to this practice seem quite consistent, overall vine performance is affected by genotype, environmental conditions, and severity of treatment...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28512329/tree-ring-widths-are-good-proxies-of-annual-variation-in-forest-productivity-in-temperate-forests
#11
Kai Xu, Xiangping Wang, Penghong Liang, Hailong An, Han Sun, Wei Han, Qiaoyan Li
Tree rings have long been used to calibrate the net primary production (NPP) time-series predicted by process-based models, based on an implicit assumption that ring-width indices (RWI) can well reflect temporal NPP change. However, this assumption has seldom been tested systematically. In this study, 36 plots were set in three forest types from four sites along a latitudinal gradient in northeast China. For each plot, we constructed chronologies and stand NPP of the past 20 years to examine: is RWI a good proxy of inter-annual variation of forest NPP for different forest types under different climate? If it is, why? Our results indicate that RWI was closely related to stand NPP in most cases, and could be used as a good proxy of NPP in temperate forests...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28510197/assimilates-mobilization-stable-canopy-temperature-and-expression-of-expansin-stabilizes-grain-weight-in-wheat-cultivar-lok-1-under-different-soil-moisture-conditions
#12
Mahesh Kumar, Susheel Kumar Raina, Venkadasamy Govindasamy, Ajay Kumar Singh, Ram Lal Choudhary, Jagadish Rane, Paramjit Singh Minhas
BACKGROUND: Grain yield of wheat is primarily determined by both grain number and grain weight, which often influence each other in response to environmental stimuli. Some of the genotypes are capable of maintaining high single grain weight (SGW) across the environments. Understanding mechanisms and factors associated with the superiority of such genotypes over others is necessary to enhance productivity of wheat. RESULTS: Experiments were conducted to elucidate the physiological basis of high SGW of LOK-1, a wheat cultivar grown in dry and hot environments in the central and peninsular zones of India...
December 2017: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/28509843/modeling-the-footprint-and-equivalent-radiance-transfer-path-length-for-tower-based-hemispherical-observations-of-chlorophyll-fluorescence
#13
Xinjie Liu, Liangyun Liu, Jiaochan Hu, Shanshan Du
The measurement of solar-induced chlorophyll fluorescence (SIF) is a new tool for estimating gross primary production (GPP). Continuous tower-based spectral observations together with flux measurements are an efficient way of linking the SIF to the GPP. Compared to conical observations, hemispherical observations made with cosine-corrected foreoptic have a much larger field of view and can better match the footprint of the tower-based flux measurements. However, estimating the equivalent radiation transfer path length (ERTPL) for hemispherical observations is more complex than for conical observations and this is a key problem that needs to be addressed before accurate retrieval of SIF can be made...
May 16, 2017: Sensors
https://www.readbyqxmd.com/read/28505882/stemflow-induced-spatial-heterogeneity-of-radiocesium-concentrations-and-stocks-in-the-soil-of-a-broadleaved-deciduous-forest
#14
Naohiro Imamura, Delphis F Levia, Jumpei Toriyama, Masahiro Kobayashi, Kazuki Nanko
The transport of radiocesium from the canopy and quantification of the spatial distribution of radiocesium in the soil of konara oak forests are important to better understand the variability of (137)Cs stocks in the soil between proximal and distal stem areas as well as fine-scale variations around the tree trunk. Moreover, a better understanding of fine-scale spatial variabilities of (137)Cs concentrations and stocks will provide insights for optimizing soil sampling strategies to provide a more robust estimation of contamination at the stand scale...
May 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28505383/arboreal-camera-trapping-expands-hyla-versicolor-complex-hylidae-canopy-use-to-new-heights
#15
Madison M Laughlin, Erik R Olson, Jonathan G Martin
No abstract text is available yet for this article.
May 15, 2017: Ecology
https://www.readbyqxmd.com/read/28503829/unravelling-seed-dispersal-through-fragmented-landscapes-frugivore-species-operate-unevenly-as-mobile-links
#16
Juan P González-Varo, Carolina S Carvalho, Juan M Arroyo, Pedro Jordano
Seed dispersal constitutes a pivotal process in an increasingly fragmented world, promoting population connectivity, colonization and range shifts in plants. Unveiling how multiple frugivore species disperse seeds through fragmented landscapes, operating as mobile links, has remained elusive owing to methodological constraints for monitoring seed dispersal events. We combine for the first time DNA barcoding and DNA microsatellites to identify, respectively, the frugivore species and the source trees of animal-dispersed seeds in forest and matrix of a fragmented landscape...
May 14, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28503381/a-survey-of-fishes-associated-with-hawaiian-deep-water-halimeda-kanaloana-bryopsidales-halimedaceae-and-avrainvillea-sp-bryopsidales-udoteaceae-meadows
#17
Ross C Langston, Heather L Spalding
The invasive macroalgal species Avrainvillea sp. and native species Halimeda kanaloana form expansive meadows that extend to depths of 80 m or more in the waters off of O'ahu and Maui, respectively. Despite their wide depth distribution, comparatively little is known about the biota associated with these macroalgal species. Our primary goals were to provide baseline information on the fish fauna associated with these deep-water macroalgal meadows and to compare the abundance and diversity of fishes between the meadow interior and sandy perimeters...
2017: PeerJ
https://www.readbyqxmd.com/read/28501633/atmospheric-mercury-deposition-to-forests-in-the-eastern-usa
#18
Martin R Risch, John F DeWild, David A Gay, Leiming Zhang, Elizabeth W Boyer, David P Krabbenhoft
Atmospheric mercury (Hg) deposition to forests is important because half of the land cover in the eastern USA is forest. Mercury was measured in autumn litterfall and weekly precipitation samples at a total of 27 National Atmospheric Deposition Program (NADP) monitoring sites in deciduous and mixed deciduous-coniferous forests in 16 states in the eastern USA during 2007-2014. These simultaneous, uniform, repeated, annual measurements of forest Hg include the broadest area and longest time frame to date. The autumn litterfall-Hg concentrations and litterfall mass at the study sites each year were combined with annual precipitation-Hg data...
May 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28498334/pastoralism-versus-agriculturalism-how-do-altered-land-use-forms-affect-the-spread-of-invasive-plants-in-the-degraded-mutara-rangelands-of-north-eastern-rwanda
#19
Torsten Wronski, Jean Damascene Bariyanga, Ping Sun, Martin Plath, Ann Apio
Lantana camara L. (Verbenaceae) originates from tropical Central and South America and has become invasive in about 50 countries. It causes problems when invading rangelands due to its toxicity to livestock and its tendency to form dense, monotonous thickets. Its invasiveness can partly be explained by the high tannin content largely protecting the species from being browsed, its tolerance to a wide range of environmental conditions, as well as its general preference for anthropogenically disturbed habitats...
May 12, 2017: Plants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28496966/effects-of-deer-on-the-photosynthetic-performance-of-invasive-and-native-forest-herbs
#20
J Mason Heberling, Nathan L Brouwer, Susan Kalisz
Overabundant generalist herbivores can facilitate non-native plant invasions, presumably through direct and indirect modifications to the environment that affect plant performance. However, ecophysiological mechanisms behind ungulate-mediated plant invasions have not been well-studied. At a long-term Odocoileus virginianus (white-tailed deer) exclusion site in a temperate deciduous forest, we quantified deer-mediated ecophysiological impacts on an invasive biennial Alliaria petiolata (garlic mustard) and two palatable native herbaceous perennials, Maianthemum racemosum and Trillium grandiflorum...
March 2017: AoB Plants
keyword
keyword
13062
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"