Showing papers on "Undergrowth published in 1981"
TL;DR: In this paper, the authors analysed Fynbos vegetation with three differing fire histories by means of a stratified systematic sample of 100 plots and found that short rotation burning resulted in a reduction in plant cover, height and biomass, as well as in the elimination of longer lived seed regenerating shrubs.
Abstract: SYNOPSIS Fynbos vegetation with three differing fire histories was analysed for floristic composition and structure by means of a stratified systematic sample of 100 plots. The three treatments (fire histories) investigated were short rotation burning (about six years), longer rotation burning (about 15 to 20 years) and protection from fire for 37 years. Short rotation burning resulted in a reduction in plant cover, height and biomass, as well as in the elimination of longer lived seed regenerating shrubs. Species diversity was relatively high and short graminoid and herb species dominated the vegetation. Longer intervals between burning resulted in a high cover and large mean plant height in mature 21-year-old vegetation, but species diversity was relatively low and undergrowth species were of much reduced importance. In vegetation protected for 37 years, large shrubs were reduced in importance due to high mortality and low recruitment; as a result undergrowth species showed some signs of recovery, and s...
77 citations
49 citations
01 Jan 1981
TL;DR: In this paper, the allometric function was used to predict biomass (dry weight) with ocular estimates of percent ground cover of the plant as the independent variable for some common ground cover plants from forest communities of northeastern Minnesota.
Abstract: Biomass prediction equations were developed for some common ground cover plants from forest communities of northeastern Minnesota. The allometric function was used to predict biomass (dry weight) with ocular estimates of percent ground cover of the plant as the independent variable.
18 citations
07 May 1981
TL;DR: In this paper, the allometric function was used to predict biomass (dry weight) with ocular estimates of percent ground cover of the plant as the independent variable for some common ground cover plants from forest communities of northeastern Minnesota.
Abstract: Biomass prediction equations were developed for some common ground cover plants from forest communities of northeastern Minnesota. The allometric function was used to predict biomass (dry weight) with ocular estimates of percent ground cover of the plant as the independent variable.
12 citations
TL;DR: In this article, the main quantitative and production parameters and theoretical aspects from the ecological analysis of biotopes have been verified by means of theEllenberg method, which makes the estimation of total production possible in conjunction with phytocenological research.
Abstract: In deciduous and coniferous mountain forests the ecological analysis and biomass production have been studied with a view to the indication parameters of plants for estimating the ecological spectrum and the production capacity of the herbaceous layer. The linkage of natural conditions and the investigated ecological factors was confirmed in comparison with forest communities of the colline belt. The main quantitative and production parameters and theoretical aspects from the ecological analysis of biotopes have been verified by means of theEllenberg method. The establishment of the productivity index makes the estimation of total production possible in conjunction with phytocenological research.
4 citations
01 Jan 1981
TL;DR: In this paper, the Feller Buncher was used for row thinning pine plantations with light and dense undergrowth conditions, and the accumulator arm allowed several small trees to be gathered before the stems are deposited on the ground.
Abstract: Production rates of a feller-buncher are shown for row thinning pine plantations with light and dense undergrowth conditions. Dense undergrowth reduced macliine output by about 20 percent. Additional keywords: Row thinning, timber harvesting, tree harvester. Feller Buncher (fig. 1). This machine was equipped with a 164nch capacity shear and an accumulator arm. In operation, two arms hold the tree while it is severed at ground level. The accumulator arm allows several small trees to be gathered before the stems are deposited on the ground.2 Severed trees are carried and piled until the desired bunch size is created.
2 citations
01 Mar 1981
TL;DR: Development of leaf cuttings under natural conditions f is recorded for the first time in Phyllagathis griffithii King and P. rotundifolia BI.
Abstract: Development of leaf cuttings under natural conditions f is recorded for the first time in Phyllagathis griffithii King and P. rotundifolia BI. (Melastomataceae). The rarity of leaf cuttings in flowering plants and the relative importance of vegetative and sexual reproduction in the undergrowth of the tropical rainforest are discussed.
2 citations