Forb


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forb

[fȯrb]
(botany)
A weed or broadleaf herb.

Forb

 

any one of a group of plants that includes all herbaceous species except true grasses, legumes, and sedges. Forbs are abundant in many types of meadows, especially mountain ones, and in meadow steppes. They predominate during the early stages in the development of meadows, for example, meadowsweet on forest clearings and Altherbosa in the Caucasus. Forbs also predominate in meadows that have undergone extreme overpasturing (lady’s-mantle and other alpine meadows), in places oversaturated with organic fertilizers (thickets of alpine dock on cattle resting places of the Caucasus and Carpathians), and in wet meadows where the true grasses have died off (mainly creeping crowfoot).

Forbs vary in ecological and biological properties and in economic value. Noxious forbs include onions, and poisonous forbs include Hellebore and Ranunculus. Some species are inedible or rarely eaten as forage. Some types of forbs are of relatively high feed value and are readily eaten by livestock (some wormwoods, saltworts, dandelion, cumin, ribwort). Others have significance as vermifuges. In various types of meadows forbs make up 10 to 60 percent (sometimes even more) of the herbage. Many forbs grow in dry-valley, lowland, and wet meadows of the nonchernozem zone, as well as in meadows in the steppe zone with intervalley chernozems. Many different kinds of forbs are found on mountain meadows.

Forbs are used principally as pasturage. In hay form, the leaves and tender snoots dry out and are crushed and lost. Cultivated pastures do not include forbs.

References in periodicals archive ?
Indicators of active colonies were mainly forbs, where two indicator species out of seven were introduced plant species.
As patches transition from being recently burned and heavily grazed to not having burned for an extended period of time and being minimally grazed, the biomass of forbs can increase for a period of time before decreasing (Fuhlendorf and Engle, 2004; Winter et al., 2012); this unimodal response of forbs is presumably a function of their interaction with graminoids whereby the competitive ability of graminoids is altered by the level of grazing they are experiencing (Fahnestock and Knapp, 1993, 1994; Damhoureyeh and Hartnett, 1997; Fuhlendorf and Engle, 2001; Winter et al., 2013).
Perennial grass and forb recovery was robust at both burn sites.
Parameters of herbaceous height, and percentages of grasses, forbs, bare ground, woody, and species richness were all evaluated for statistically significant (P<0.05) differences.
Species were grouped into the following life forms: forbs (excluding Graminoids), shrubs, trees, and grasses (Poaceae, Juncaceae and Cyperaceae).
Moose in RMNP use riparian willow communities during the summer, which contain little aquatic vegetation or forbs. Moose were observed eating 9 different non- woody species.
Using a 50 cm x 50 cm modified Daubenmire frame (Daubenmire 1959), plant species composition, relative frequency of each species, percent canopy cover (live, dead, grasses, forbs, and woody vegetation), litter depth and cover and bare ground cover were determined at 6 fixed points along each transect.
Univariate results of the five study regions combined indicate that Bachman's Sparrows occupied areas with relatively low mean values ([less than] 34%) for percent woody cover, percent forb cover, and tree density, but higher values ([greater than] 58%) in percentages of ground cover, grass cover, and litter cover (Table 1).
Growth forms included graminoids (Poaceae, Cyperaceae, Juncaceae, Hypoxidaceae, Xyridaceae) with grass-like foliage, forbs (herbs with broad leaves), woody vines, and shrubs.
For each 1 x 1 m plot, plant biomass and forb densities were summed across the three community sampling quadrats and then expressed at the plot level on a per square meter basis.
(2002) were not able to separate selection by lesser prairie-chickens for areas of forb cover from selection of areas with greater invertebrate biomass associated with forb cover.
Fowler and Jones joined the firm in October 2009 from Fortis Bank (FOR.BR) (AMS: FORB) (DUS: FORB) (OTC: FORSY), to lead the Swiss bank's expansion into the Reserve Based Lending business.