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Showing 1 to 20 of 20 for “"subcanopy"”.
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Improving parameterization of scalar transport through vegetation in a coupled ecosystem-atmosphere model
… ecosystem models currently parameterize subcanopy scalar transport using a rough-wall boundary eddy diffusivity formulation. This formulation predicts unreasonably high soil evaporation beneath tall, dense forests and low soil evaporation beneath short, sparse grass. This study …
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Classification and dynamics of the forest vegetation of Hluhluwe Nature Reserve, Kwa Zulu-Natal
… and CANOCO. The composition of the canopy and subcanopy is distinct. Four canopy and two subcanopy communities can be detected. Community succession in the mature forest takes the form of almost random replacement of canopy trees through two subcanopy communities. Size-class distributions …
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Growth release of trees following fine-scale canopy disturbances in old-growth forests of coastal British Columbia, Canada
… I examined growth release of canopy and subcanopy trees following the formation of natural, fine-scale canopy gaps in old-growth, western red cedar-western hemlock forests of coastal British Columbia. I aimed to quantify detailed information on release of the three shade-tolerant tree …
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The photoprotective role of thermonastic leaf movements in Rhododendron maximum: potential implications to early spring carbon gain
Rhododendron maximum L. is a dominant subcanopy species in the southern Appalachian Mountains. R. maximum undergo distinct thermonastic leaf movements (TLM). The purpose of these movements has not yet been determined. Previous studies have suggested TLM are a photoprotective mechanism for the …
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Environmental determinism and forest structure and composition: a naturally replicated experiment
… composition (p>0.05), the composition of the subcanopy strata vegetation differed Significantly among sites (p<0.05). This indicated that stochastic events (e.g. low intensity ground fires, deer browsing, cattle grazing) were were important factors during the development of understory and …
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The effect of urbanization on the stopover ecology of neotropical migrant songbirds
… structure variables, especially understory and subcanopy composition, were important factors for many models. Bird species determined to be area sensitive in previous studies were associated with large patches during migration. While path size, distance from the shoreline and urbanization were …
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The influence of size and density of the Camelthorn (Acacia erioloba Meyer) on its keystone role in the Xeric Kalahari
… that facilitate the existence of a suite of subcanopy plants. Indeed, large A. erioloba tress have been mooted as a context-depend keystones species, important to other biota and ecological prcesess. The primary aim of this study was to investigate the importance of A. erioloba to …
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The ecological significance of leaf movements in Rhododendron maximum
… movements in Rhododendron maximum, which is a subcanopy, evergreen species distributed in seasonally cold environments. Leaf movements could be necessary for maintaining a favorable energy balance and/or avoiding photoinhibition and photooxidation. A series of leaf manipulation treatments were …
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Factors governing zoysiagrass response to herbicides applied during spring green-up
… led to confusion since zoysiagrass typically has subcanopy green leaves and stems throughout the winter dormancy period. No research has sought to explain why some turfgrass managers are observing zoysiagrass injury when the literature only offers evidence that these herbicides do not injure …
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Snowfall Interception and Ablation in Needleleaf Canopies: Observations and Model Development
… Ranging (UAV-lidar), snow surveys, and weighed subcanopy snow buckets showed a strong linear relationship between initial interception efficiency (initial snow interception divided by snowfall) and the snow-leaf contact area. This metric accounts for the potential increase in contact area with …
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Forest Net Primary Production Resistance Across a Gradient of Moderate Disturbance
… severity, greater light availability to the subcanopy enhanced leaf-level C uptake and the growth of this formerly light-limited canopy stratum, compensating for upper canopy production losses. As a result, whole-ecosystem production efficiency (ANPPw/LAI) increased at high levels of …
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A Comparison of Summer and Winter Roosting Habitat and Behavior of Evening Bats (Nycticeius Humeralis) in Missouri
… due to the lower density of trees in the subcanopy. I also report interesting roosting behaviors utilized by N. humeralis, including the use of a subterranean roost by one individual during the winter.
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A range-wide disturbance history for Quercus alba in the eastern US
… areas of the canopy, cause significant damage to subcanopy individuals, and allow disturbance-oriented and mid-successional taxa, such as Quercus, to establish. This return interval for high magnitude disturbance events can be imitated by land managers throughout the region in effort to promote …
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Microwave remote sensing of water in the soil - plant system
… from the NASA Airborne Microwave Observatory of Subcanopy and Subsurface (AirMOSS) Mission over the Harvard Forest in Western Massachusetts. Additionally, at L-band, a multi-temporal algorithm is introduced to determine vegetation optical depth (VOD) alongside soil moisture. The multi-temporal …
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Effects of Hurricane Disturbance on the Stopover Ecology of Intercontinental Landbird Migrants in Coastal Louisiana
… guilds based on the vertical height (i.e. canopy/subcanopy, understory, and ground) and foraging substrate (e.g. live foliage, leaf litter) where birds were typically observed in chenieres during spring migration. Bird mist net capture data, avian transect data, and vegetation survey data …
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Foraging Ecology And Habitat Selection Of The Western Yellow Robin (Eopsaltria Griseogularis) In A Wandoo Woodland, Western Australia : Conservation Ecology Of A Declining Species
… all seasons, with dead branches of live subcanopy Wandoo trees (Eucalyptus wandoo) and dead fallen timber as the dominant perch substrate throughout all seasons. However, interseasonal shifts were detected, exemplified by a decrease in proportion of ground pouncing, and an increase in …
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Heterogeneous chemistry of HONO and surface exchange
… sweeps and only intermittent decoupling of the subcanopy during these periods. Around sunset, the whole forest became decoupled from the air layers above. This caused a steep increase in mixing ratio differences up to about 170 ppt due to a faster increase below canopy, indicating local …
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Avian assemblages and Red-eyed Vireo nest survival within mineland forest
… the other assemblage types. Species that use the subcanopy and midcanopy for nesting and foraging were discriminating components of compacted bench assemblages. Relative abundance of the closed-canopy guild was lower within mined forest than within unmined forest.;In total, this research has shown …
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The role of human disturbance in the dynamics and distribution of sand forest in and around Tembe Elephant Park, KwaZulu-Natal.
… huts built was composed of thin understorey and subcanopy sand forest woody species. Strong evidence of resprouting occurred in these species and species composition of huts was similar to an earlier study underrnken in J 982. This suggested lhat impact 011 forest dynamics was not substantial for …
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Inhibition of Canopy Tree Seedlings by Thickets of <I>Rhododendron maximum</I> L. (Ericaceae) in an Eastern Deciduous Forest
… maximum</I>. The impact of the <I>R. maximum</I> subcanopy on understory PAR and subsequent influence on canopy tree seedling photosynthetic capacity implies that sunflecks are critical for seedling net carbon gain in these forest understory environments. To determine the effect of <I>R. …