Primary Production, Mineral Nutrients and Litter Decomposition in the Grassland Ecosystem

Perkins, D. F.; Jones, Vivienne J.; Millar, Rebecca; Neep, P.

doi:10.1007/978-3-642-66760-2_16

Cited by 29 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The net primary production (NPP) at DHG has not been determined, but an approximate estimate can be made from the results of Perkins et al (1978) who performed a detailed study of production in an Agrostis-Festuca grassland at Lyn Llydaw (Snowdonia, N. Wales), with altitude, slope, climate and land use similar to those at DHG. They estimated NPP to be 1,450 g dry weight m À2 a À1 , taking into account both above-and below-ground growth.…”

Section: Site Descriptionmentioning

confidence: 99%

“…The assumed standing litter pool (above and below ground) is 100 gC m À2 , estimated from the results of Perkins et al (1978) for similar sites in north Wales (see Site description). The substrate pool is set at the approximate value of 400 gC m À2 , based on the estimate of several hundred gC m À2 for ''young humin'' (see above).…”

Section: Application Of Dydocmentioning

confidence: 99%

See 1 more Smart Citation

The organic carbon dynamics of a moorland catchment in N. W. England

et al. 2007

View full text Add to dashboard Cite

The carbon cycle was quantified in the catchment of Doe House Gill, which drains highrelief moorland, with thin organic-rich soils (leptosols and podzols) 10-25 cm deep, in northern England. The soil C pool of 8,300 g m -2 is due mainly to humic acid and older humin. If steady state is assumed, and a single soil C pool, the average 14 C content of the whole soil (93% modern) yields a mean carbon residence time of 800 years, although this varied from 300 to 1,600 years in the four samples studied. Stream water fluxes of dissolved and particulate organic carbon (DOC, POC) were 2.5 and 0.4 g m À2 a À1 respectively in 2002-2003, lower than values for some other upland streams in the UK. The C pool, flux, and isotope data were used, with the assumption of steady state, to calibrate DyDOC, a model that simulates the soil carbon cycle, including the generation and transport of DOC. According to DyDOC, the litter pool (ca. 100 gC m À2 ) turns over quickly, and most (>90%) of the litter carbon is rapidly mineralised. The soil is calculated to gain only 16 gC m À2 a À1 , and to lose the same amount, about 80% as CO 2 and 20% as DOC. From the DO 14 C content of 107.5% modern (due to ''bomb carbon'') the model could be calibrated by assuming all DOC to come directly from litter, but DOC is more likely a mixture, derived from more than one soil C pool. The seasonal variability exhibited by stream water DOC concentration (maximum in September, minimum in January) is attributed mainly to variations in rainfall and evapotranspiration, rather than in the metabolic production rate of ''potential DOC''. The model predicts that, for a Q 10 of 2, the total soil organic C pool would decrease by about 5% if subjected to warming over 200 years. DyDOC predicts higher DOC fluxes in response to increased litter inputs or warming, and can simulate changes in DOC flux due to variations in sorption to soil solids, that might occur due to acidification and its reversal.

show abstract

Section: Site Descriptionmentioning

confidence: 99%

Section: Application Of Dydocmentioning

confidence: 99%

The organic carbon dynamics of a moorland catchment in N. W. England

et al. 2007

View full text Add to dashboard Cite

show abstract

“…La retención de este nutriente en los tejidos animales es muy pequeña en comparación con la que experimentan otros elementos, como calcio o nitrógeno (PERKINS et al, 1978). La mayor parte del potasio asimilado por un animal vuelve al suelo a través de la orina (WILKINSON y LOWREY, 1973), siendo en consecuencia soluble en agua e inmediatamente disponible para la vegetación.…”

Section: Resultados Y Discusiónunclassified

El ciclo del potasio en dehesas de Quercus rotundifolia y Quercus pyrenaica

Berián¹,

Criado²,

Peloche³

1985

MDTRRA

View full text Add to dashboard Cite

EL CICLO DEL POTASIO EN DEHESAS DEEl potasio es el elemento que se transfiere en mayores proporciones a través de frutos y de material herbáceo, que son materias altamente digestibles. Por ello, su transferencia al subsistema herbívoro es mayor que para los restantes nutrientes.El potasio es también el macronutriente más intensamente extraído de los tejidos vegetables por el agua de lluvia.Todo ello hace al potasio muy móvil y con intensas tasas de circulación a través del ecosistema. THE POTASSIUM CYCLE IN QUERCUS ROTUNDIFOLIA AND QUERCUS PYRENAICA .DEHESAS • SUMMARYA study was made of the potassium cycle in Quercus rotundifolia Lam. and Quercus pyrenaica Willd. dehesa ecosystems in the province of Salamanca, Spain.Potassium was seen to be the element whích was transferred in the greatest proportions through the fruits and herbaceous materials: these are highly digestible. Accordingly, the transference to the herbivore subsystem is greater than that of the remaining nutrients.(1) Dpto.

show abstract

“…Estimates of the NPP for N. stricta grassland in the UK have been obtained by a number of authors (Rawes and Welch, 1969; Job and Taylor, 1978; Perkins et al ., 1978; Tiley et al ., 1986; Milne et al ., 2002). These values range from 193 g DM m −2 (Rawes and Welch, 1969) to 436 g DM m −2 (Job and Taylor, 1978) but differences in species composition, geographical location, altitude, environmental conditions, grazing management and methodology make meaningful comparisons with the values obtained from this study difficult.…”

Section: Discussionmentioning

confidence: 99%

“…Using this method, production during periods of high senescence (particularly during the late summer and autumn) is under‐estimated. Bryophytes were excluded from the production calculations because of their spatial heterogeneity and different growth pattern (Perkins et al. , 1978).…”

Section: Methodsmentioning

confidence: 99%

Effect of different grazing management systems on the herbage mass and pasture height of a Nardus stricta grassland in western Scotland, United Kingdom

Holland¹,

Waterhouse²,

Robertson³

et al. 2008

Grass and Forage Science

View full text Add to dashboard Cite

The aims of this study were to examine the effect of three grazing treatments (year-round stocking rates of 0AE8 ewes ha )1 , 0AE5 ewes ha )1 and 0AE5 ewes ha )1 plus grazing cattle in summer), imposed for 4 years, on the herbage mass and surface height of a Nardus strictadominated grassland in western Scotland and to obtain estimates of annual productivity of this grassland. Nardus stricta-dominated grassland comprised proportionately 0AE20 of the grazing area. Stocking rate of sheep had no significant effect on the herbage mass of the grassland in the first 2 years of the experiment, although mean summer pasture heights were significantly higher under the lower stocking rate of sheep. The pasture on the treatment with cattle grazing in summer had a significantly lower herbage mass and lower surface height than the two sheep-only grazing treatments. Year-to-year variation in the herbage mass and surface height of herbage in summer was greater than the effect of treatments. Despite changes in surface height, the structural diversity of the grasslands was not increased by the treatments. The annual production of vascular plant material ranged from 417 g DM m )2 in 1994 to 628 g DM m )2 in 1996.

show abstract

Primary Production, Mineral Nutrients and Litter Decomposition in the Grassland Ecosystem

Cited by 29 publications

References 0 publications

The organic carbon dynamics of a moorland catchment in N. W. England

The organic carbon dynamics of a moorland catchment in N. W. England

El ciclo del potasio en dehesas de Quercus rotundifolia y Quercus pyrenaica

Effect of different grazing management systems on the herbage mass and pasture height of a Nardus stricta grassland in western Scotland, United Kingdom

Contact Info

Product

Resources

About