Undergrowth

About: Undergrowth is a research topic. Over the lifetime, 795 publications have been published within this topic receiving 11911 citations. The topic is also known as: understorey & underbrush.

La reproduction du roitelet à triple bandeau Regulus ignicapillus dans une chênaie caducifoliée de l'Allier (France)

Abstract: Firecrest are found yearly in mature deciduous oak Quercus robur and petraea timber forest of the Allier departement, numbers are variable but densities never exceed 2 territorial males per 10 ha. From 2002 to 2005, on 9 plots located in Lespinasse state forest the species used the same areas, always including trees colonized by ivy Hedera helix. Nests are generally hidden in ivy covering a trunk (62% of cases) or main branches (20% of cases) of canopy oaks, more rarely in Hornbeam Carpinus betulus and Field Maple Acer campestre of the lower canopy. Nests are found from 2.5 to 22 m from the ground (mean 9.6m, n=32). Most nest face north (52%) or east (27%), and are therefore in the shade for most of the day. Territorial and singing behaviour of males is described, especially during times without a mate and incubation. In 2002, 2004 and 2005 almost half the sites were used by males that remained single, some of them remaining territorial for up to 2-4 consecutive months. In 2003 all males found a mate. As no nests were inspected clutch size is not known, but the monitoring of 23 pairs over three years proves that 16 did not raise a single fledged juvenile. The seven successful first broods led to three second brood attempts. The total number of emancipated juveniles reared by a pair through all its breeding attempts varies from 2 to 6. Amongst the 10 breeding individuals (7 males and 3 females) colour-ringed in 2003, only one male, which had successfully completed both its breeding attempts, attempted unsuccessfully to breed in 2004 with a new female after having overwintered on site. This male was still present until early April 2005. A second male, also overtering in its breeding territory disappeared before the following breeding season. Overwintering of the species is facilitated on plots with a lot of Holy ilex aquifolium in the undergrowth which is used a lot by the species and Goldcrest which only overwinters on site.

Biomass Characteristics of The Deteriorated Pinus massoniana Forests in Red Soil Low Hilly

Abstract: By the methods of sample tree(for tree layer) and quadrat yield(for shrub layer,herbaceous layer and humus layer),the biomass of four deteriorated Pinus massoniana mixed stands and one pure P.massoniana plantation and its allocation were studied in this paper.The results showed that the biomass of tree layer in the mixed forest of Schima superba and P.massoniana,Chinese chestnut and P.massoniana,Sour jujube and P.massoniana,and Liquidambar formosana and P.massoniana was 135.501 t/hm2,31.499 t/hm2,22.138 t/hm2 and 69.725 t/hm2,respectively,and 37.043 t/hm2 for the pure pine stand.The stems,branches and leaves was accounted for 40.39%~74.87%,11.40%~32.67% and 9.31%~26.94% of total biomass respective in the four mixed stands.For the undergrowth vegetation,the biomass was 6.649 t/hm2 in the pure P.massoniana plantations,while only 3.825 t/hm2 in the mixed Schima superba and P.massoniana plantations.The forest litter was the most in the mixed Schima superba and P.massoniana plantations and it was the least in the mixed Liquidambar formosana and P.massoniana plantations.The average biomass for all stands was 68.095 t/hm2.

The Richness and Cover of Alien Plants in the Undergrowth and Field Layer of Urbanized Southern Taiga Forests

Abstract: The aim of the work is to compare the richness (the number of species in 400 m2) and cover of alien plants in the undergrowth and field layer of a large city forest. The research was carried out in 2016–2017 in the southern taiga subzone of the Eurasian boreal zone, specifically in the urban forests of the industrial city of Ekaterinburg (the Central Urals, Russia) and the area around it. 235 plots have been analyzed. The number and cover of alien species in the undergrowth and field layer are contrastively different. The richness and cover of alien herbaceous species are much less than the richness and cover of alien woody plants (shrubs and trees) in the undergrowth. Thus, the undergrowth layer has transformed much more comprehensively as a result of alien plant invasions than the field layer. This conclusion is valid both for analysis on the scale of individual plots and for the analysis of complete species lists in urban and suburban forests. This statement is also true for the analysis of the cover of alien plants. This result appears to be unexpected.

Distribution of Cyperus Chamaecephalus Cherm., a Forest Undergrowth Species with Inconspicuous Inflorescences

Abstract: The distribution of Cyperus chamaecephalus Cherm, a frequently overlooked forest undergrowth species with inconspicuous inflorescences, has been very poorly documented The authors report several recent discoveries which permit a more complete understanding of its geographical distribution in Madagascar’s lowland and mountain rainforests