نتایج جستجو برای: forest stands
تعداد نتایج: 123621 فیلتر نتایج به سال:
The maple-basswood community type has long been associated with the "Big Woods" of Minnesota and adjacent Wisconsin, although this community type also exists in discontinuous phases within surrounding forest types. This study looks at the apparent most northwestern outlier of the maple-basswood community type, Rydell National Wildlife Refuge (NWR) in Minnesota. Specific goals are (1) to determi...
Abstract Todaychr('39')s forest structure issue has converted to one of the main ecological debates in forest science. Determination of forest structure characteristics is necessary to investigate stands changing process, for silviculture interventions and revival operations planning. In order to investigate structure of the part of Ghale-Gol forests in Khorramabad, a set of indices such as Cla...
a r t i c l e i n f o Keywords: Forest stand height Forest inventory Remote sensing QuickBird Panchromatic Object-based Boreal Monitoring Mean stand height is an important parameter for forest volume and biomass estimation in support of monitoring and management activities. Information on mean stand height is typically obtained through the manual interpretation of aerial photography, often supp...
Previous studies have shown that forest floors from stands dominated by trembling aspen (ASPEN; Populus tremuloides Michx.) tend to support a greater microbial biomass with a different microbial community structure than forest floors from stands dominated by white spruce (SPRUCE; Picea glauca (Moench) Voss). A reciprocal transfer experiment, in concert with coarse and fine mesh bags that allowe...
Patterns of biomass and carbon (C) storage distribution across Chinese pine (Pinus tabulaeformis) natural secondary forests are poorly documented. The objectives of this study were to examine the biomass and C pools of the major ecosystem components in a replicated age sequence of P. tabulaeformis secondary forest stands in Northern China. Within each stand, biomass of above- and belowground tr...
The main purpose of this study is to derive forest recreation demand in Jizerske Mountains Protected Landscape Area and to disentangle aesthetic factors that are responsible for changes in recreation utility of visitors. We estimate visitors’ preferences for alternative forest sites as a function of site characteristics using choice experiment technique. As forest scenic beauty may represent a ...
1. In Europe, intensively managed coniferous plantations rarely achieve similar nature conservation functions as deciduous woodlands. The ability to identify coniferous plantations that might be successfully converted to deciduous woodland is a key goal in forest management. The herbaceous plant community composition of mature plantations may be an accurate selection criterion for stands that a...
Impacts of an exotic disease and vegetation change on foliar calcium cycling in Appalachian forests.
Because of the high calcium content of its foliage, Cornus florida (flowering dogwood) has been described as a calcium "pump" that draws calcium from deeper mineral soil and enriches surface soil horizons. However, over the last two decades an exotic fungal disease (dogwood anthracnose, Discula destructiva) has decimated populations of this once-common understory species. Its loss, combined wit...
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