Herbage Response to Precommercial Thinning in Direct-Seeded Slash Pine

Grelen, Harold E.; Whitaker, L.B.; Lohrey, Richard E.

doi:10.2307/3897000

Cited by 11 publications

(10 citation statements)

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“…In the early-successional coniferous forests of pines and Douglas-fir, the top biomasses of ground vegetation averaged about 161 g/m2 (Gaines et al 1954, Ovington 1955, Pase and Hurd 1958, Cole et al 1967, Forrest and Ovington 1970, Basile and Jensen 1971, Grelen et al 1972, Grelen and Enghardt 1973, McLean and Smith 1973, Nemeth 1973, Wolters 1973) as compared to only 38 g/m2 calculated for the late-successional coniferous communities of spruce, fir, and redwood (Baskerville 1966, Whittaker 1966, Young et al 1967, Brown 1972, Telfers 1972, Brezeanu et al 1973). …”

Section: Terminal Aboveground Biomassmentioning

confidence: 96%

“…Experiments indicate that yields of herbage can be increased severalfold by reducing canopy cover or tree basal area which allows more light and precipitation to reach the ground and reduces the competition from trees (Gaines et al 1954, Pase and Hurd 1958, Ehrenreich and Crosby 1960, Young et al 1967, McConnell and Smith 1970, Blair 1971, Halls and Alcaniz 1971, Grelen et al 1972). Experiments indicate that yields of herbage can be increased severalfold by reducing canopy cover or tree basal area which allows more light and precipitation to reach the ground and reduces the competition from trees (Gaines et al 1954, Pase and Hurd 1958, Ehrenreich and Crosby 1960, Young et al 1967, McConnell and Smith 1970, Blair 1971, Halls and Alcaniz 1971, Grelen et al 1972).…”

Section: Effects Of Lighltmentioning

confidence: 99%

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Ground Vegetation Biomass, Production, and Efficiency of Energy Utilization in Some Northern Wisconsin Forest Ecosystems

Zavitkovski¹

1976

Ecology

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The aboveground biomass of the herb stratum, including woody species up to 30 cm tall, was determined by harvesting annually over a 4—yr period (1969—72) in aspen, maple—aspen—birch, birch, northern hardwood, and logging road communities. Average aboveground biomass in the respective community types was 117.5, 63.0, 51.0, 37.6, and 80.6 g/m2. Root biomass was determined by harvesting the belowground part on selected plots in 1971. Cumulative solar energy received at the sample points was measured with a chemical integrating light meter (petroleum ether chlorophyll extracts). Phenological observations indicated that net annual production in the four forest types was essentially equal to their end—of—season standing crop biomass. Average root:top ratios ranged from 2.98 to 4.79 and were higher in the dry communities (birch and northern hardwood) than in the other more mesic forest. Except for the logging road, two to five species accounted for most of the biomass in each community. Significant positive correlations were found between incident solar energy and aboveground biomass. Efficiency ranged from 0.82% to 2.19% based on May—October cumulative energy in the visible spectrum and cover adjusted aboveground biomass.

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Section: Terminal Aboveground Biomassmentioning

confidence: 96%

Section: Effects Of Lighltmentioning

confidence: 99%

Ground Vegetation Biomass, Production, and Efficiency of Energy Utilization in Some Northern Wisconsin Forest Ecosystems

Zavitkovski¹

1976

Ecology

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“…It has frequently been shown that clearing woody plants results in increased herbaceous production (Staples, 1946;Grenlen, Whittaker & Lohrey, 1972;Sneva, 1972). In Rhodesia increases of around 400% can be expected when well-wooded areas are cleared (Barnes, 1972;.…”

Section: Advantages Of Retaining Woody Plantsmentioning

confidence: 99%

The significance of the woody component of semi‐arid savanna vegetation in relation to meat production

Kelly¹

1977

Proceedings of the Annual Congresses of the Grassland Society o

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In many semi-arid savanna areas of southern Africa extensive beef ranching is the main form of land use. Cattle prefer to graze rather than to browse and the woody component of the vegetation is therefore normally underutilized. Beef ranching will remain important but it is suggested that the use of domesticated browsers such as goats and eland in conjunction with cattle would achieve better overall utilization of the vegetation and prevent bush encroachment. Increased meat production would also be expected. However, not enough is known about the effects on the vegetation of stocking with both browsing and grazing animals to allow for the definition of clear management policies. Further information is needed about the woody plant standing crop and seasonal production in various vegetation types, woody species composition, browse quality and availability, the effects of utilization on woody plants, carrying capacity, the management principles for sustained woody foliage production, and the detailed relationships within the 'browse-grass-browser-grazer' complex. The effects of manipulation of the woody component on the quantity and quality of herbaceous feed and on ecosystem stability must also be considered. It is suggested that research should be within the framework of cattle ranching and aimed at maximum sustained meat production. UITTREKSEL In menige ariede en semi-ariede savanne gebiede van suidelike Afrika is ekstensiewe beesboerdery die vernaamste praktyk vir die benutting van die natuurlike plantegroei. Beeste verkies gras en dit het tot gevolg dat die boskomponent onderbenut is. Beesboerdery sal egter die vernaamste vorm van boerdery in die bosveldgebiede bly. Dit is voor die hand liggend dat deur gebruik te maak van stmikvreters beter benutting van plantegroei asook beheer oor bosindringing verkry kan word, 'n Direkte gevolg van so 'n stop sal 'n verhoging in vleisproduksie per eenheid weiding tot gevolg hê.Bokke en elande besit die vermoë om bosplantegroei te benut. Min is egter bekend oor die moontlikheid van met beeste en ander plantvretende diere gelyktydig te boer. Verdere inligting oor die volgende aspekte betreffende die produksie-moontlikhede van die boskomponent moet ingewin word. Hierdie aspekte sluit in seisoenale produksie, spesiesamestelling, weidingskwaliteit en beskikbaarheid, benutting en die effek van benutting, drakrag, beginsels van bestuur vir gehandhaafde blaarproduksie en die presiese verwantskap binne die kompleks van blare en gras asook tussen die struikvreters en weidiere. Oorweging moet ook geskenk word aan die effek wat die manipulasie van die boskomponente op die bosgemeenskap en die stabiliteit van die ekosisteem sal hê. Navorsing moet dus binne die raamwerk van beesboerdery beplan word en moet as doelstelling hê, maksimum vleisproduksie per eenheid weiding.

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“…Many studies of the relationship between pasture productivity and the growth of widely spaced trees in agroforestry systems indicate a high degree of competition between the pasture and trees [1,3,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Models describing the relationship between pasture and trees have generally adopted some measure of tree crown cover in order to predict pasture production [3,6]. For intensively managed agroforestry involving radiata pine (P. radiata), Percival et al [7] established a relationship between pasture yield, total green crown length and mean green crown length per hectare.…”

Section: Introductionmentioning

confidence: 99%

Development and validation of a simple approach to modelling tree shading in agroforestry systems

Reid

Ferguson

1992

Agroforest Syst

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There have been a number of models developed which attempt to predict the shading patterns beneath individual tree or forest canopies. We describe a computer-based model which is able to estimate shading patterns through a discontinuous canopy of pruned trees. The model is designed to assist in the layout and management of agroforestry systems with widely spaced trees. The model was tested against data collected from a seven-year-old agroforestry system involving radiata pine, located near Canberra, Australia. The model was shown to slightly but consistently underestimate light penetration at ground level beneath the trees. However, the extent of bias (0.7% to 5%) was so small as to be of little significance in practice.

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Herbage Response to Precommercial Thinning in Direct-Seeded Slash Pine

Cited by 11 publications

References 0 publications

Ground Vegetation Biomass, Production, and Efficiency of Energy Utilization in Some Northern Wisconsin Forest Ecosystems

Ground Vegetation Biomass, Production, and Efficiency of Energy Utilization in Some Northern Wisconsin Forest Ecosystems

The significance of the woody component of semi‐arid savanna vegetation in relation to meat production

Development and validation of a simple approach to modelling tree shading in agroforestry systems

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