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.

Comparisons of Understorey Vegetation in Planted Fallows of Seven Multipurpose Tree Species (MPTS) in South-Western Nigeria

Abstract: Planted fallows of seven multipurpose tree species were analysed in order to reveal their impact on understorey vegetation in South-Western Nigeria. Although having light environment under their canopy comparable with most of the other tree species, Nuclea latifolia and Pterocarpus santalinoides had the lowest density and biomass of understorey vegetation. Only Milletia thoningi had lower understorey biomass than these two tree species although it had higher understorey density. Soil fertility was not a limiting factor for the undergrowth since those three species which had the highest undergrowth density and biomass had either comparable or lower fertility status. This implies that, the suppressive effect of Nuclea latifolia and Pterocarpus santalinoides the understorey growth might have been due to allelopathic effects caused by secondary metabolites leached from the tree canopy during precipitation or from the floor litter during decomposition. Because of the limitations imposed by the lack of randomisation of the tree stands in the site, conventional analysis of variance was not appropriate. Instead, the calculated means for each variable was used to compare the results.

Research on the Biomass of Pinus massoniana Plantations

Abstract: The spatial distribution patterns of biomass of 5-years Pinus massoniana plantation were investigated in Jiangle County.The result indicated that the total biomass of P.massoniana was 35.512 t/hm2,the biomass of tree layer,undergrowth vegetation layer and litter layer were 28.608 t/hm2,3.861 t/hm2,3.043 t/hm2,respectively,which accounted for 80.56%,10.87%,8.57%,respectively.The biomass distribution of each organ in tree layer followed the order of stems(40.90%)branches(25.73%)roots(23.87%) leaves(9.50%).In terms of the biomass distribution patterns above ground in tree layer,the biomass distribution of branches and leaves of P.massoniana were mainly in 1-3 m section,whereas,the biomass distribution of stem were mainly in 0-2 m section.

Study on the species diversity of undergrowth in the different stand densities of Pinus tabulaeformis plantation of Xiaolongshan area

Abstract: 【Objective】This paper studied the influence of stand density on species diversity of undergrowth of Pinus tabulaeformis plantation in Xiaolongshan area,to put forward an appropriate stand density.【Method】Five types of 30 years stand density were selected,and the law of important values,species richness,species diversity index,evenness index and similarity coefficient changing with stand density were analyzed.【Result】① There were 50 vascular species in 38 families and 23 genus of undergrowth in P.tabulaeformis.As stand density increased,species number decreased,and the composition of shrub and herb changed.②Species richness,Shannon-Wiener,Simpson index in shrub layer and herb layer deceased.③Correlation coefficient analysis showed that the stand density had some relationship with species richness and the evenness index of herb layer,which had significantly negative correlation with the stand density.④ As stand density increased,the total forest loss of species,and similarity index gradually decreased.【Conclusion】Analysis showed that stand density did have influence on species diversity,but the influence was no significant.When stand density was 1717-1 867 plant/hm2,species diversity index except that Alatalo reached the highest,which indicated that the density was more appropriate for growth and development of understory vegetation,and can contribute to an increase in forest diversity.

Natural Regeneration of Indigenous Tree Seedlings Under Broussonetia Papyrifera Stand

Abstract: Broussonetia papyrifera is an exotic invasive tree species in Ghana with some documented evidences on their impact on the forest ecosystem. It proliferation could be detrimental to undergrowth diversity of indigenous tree species. The study sought to evaluate the effect of Broussonetia papyrifera on regeneration of indigenous tree seedlings in Bia Tano Forest Reserve of Ghana. Ten sub plots were laid within two separate main plots of 100 m x 20 m in both Broussonetia papyrifera and natural forest stand. The study identified nine indigenous tree seedlings within the Broussonetia papyrifera stand whilst thirteen (13) indigenous tree seedlings were identified under the natural forest stand. The Broussonetia stand had a Shannon’s diversity index of 1.87 compared with the natural stand of 1.84. The effective number of species were 6.50 and 6.20 for Broussonetia papyrifera and natural stand respectively. No significant difference was observed in Shannon’s diversity index Shannon evenness and effective number of species. Species richness was however significantly different with Natural forest having the highest value of 13. Celtis milbraedii, Cola gigantean, Triplochiton scleroxylon, Antiaris toxicaria, Nesorgodonia papyverifera and Blighia sapida were higher in Broussonetia papyrifera stand than the natural forest. The notion that Broussonetia papyrifera suppresses the emergence of indigenous tree species could not be ascertained. However, it was clear that the closer of canopy under Broussonetia papyriferasuppresses shade intolerant and favours shade loving species. Canopy closure could be key in suppressing tree species rather than Broussonetia papyrifera.

The Occurrence of the Tick Haemaphysalis Concinna Koch in Relation of Tickborne Encephalitis

Abstract: In Austria H. concinna is present in the provinces: In Burgenland, in Niederosterreich, in Oberosterreich. This species prefers such localities as moist, light, scattered woods, with a well developed undergrowth, furthermore woodclearings, edges of woods, the biotope of reed bents in the lowlands (around the Neusiedler Lake) and the water-meadows of the Danube. The preferred habitats of these ticks are related to specific plant eco-systems, namely: Phragmites communis, Cariceto-remotae-Fraxinetum, Querco Carpinetum, Querco luculetum, Quercetum cerris and the moist steppe biotopes in the environment of the Neusiedler Lake and the neighbouring Zick lakes.