Matches in SemOpenAlex for { <https://semopenalex.org/work/W1545559871> ?p ?o ?g. }
Showing items 1 to 95 of
95
with 100 items per page.
- W1545559871 abstract "The presence of grazing animals contributes to a much greater spatial heterogeneity in the cycling of C and N within grasslands, compared to arable land. This is primarily due to the deposition of excreta in patches rather than evenly over the field. However, an additional source of heterogeneity is introduced because grazing animals do not evenly utilise the grassland. Herbage contaminated by their faeces will tend to be rejected, as will poor quality (low digestibility) vegetation. There is therefore good reason to expect that C and N cycling will be highly spatially variable in grazed grassland. Hitherto, grassland models have assumed C and N dynamics to be uniform within a field. In this paper, modelling is used to investigate the potential effect of spatial heterogeneity on the estimated C sequestration and N emissions in grazed grassland.The FASSET farm model (www.fasset.dk) was modified to describe the dynamics of spatial heterogeneity in grassland. For each day that the grassland is grazed, the area of sward receiving urine is calculated from the stocking density, frequency of urination and an assumed standard area per urine. This calculation is repeated for faeces. The grassland is initially assumed to be spatially homogenous i.e. is comprised of a single ‘basal’ patch, with an area equal to that of the field. Each day, three new patches are created to represent the newly formed excretal areas, each containing independent versions of the sub-models of the soil/plant system. Two of the new patches are created with a size equal to the area of the basal patch that covered by the sum of all excretions of either dung or urine from each day. The third is an ‘overlap’ patch, representing the situations where excreta is deposited on areas that have previously received dung or urine. The area attributed to the basal patch and older dung or urine patches is reduced accordingly. Herbage offtake and the amount of C and N in excreta is calculated using a cattle model based on the Danish factorial system for energy and protein partitioning but with the addition of diet selection.Three scenarios of increasing complexity were examined; 1) no heterogeneity, 2) heterogeneity but no diet selection and 3) heterogeneity plus diet selection. The model was run for 5 years. When the soils were initiated with a C content typical for a Danish soil, there was considerable annual C sequestration. The simulated C sequestration was only marginally affected by inclusion of spatial heterogeneity, as there is a fairly linear relationship between C return to the soil and total sequestration. However, the simulated N2O emissions and nitrate leaching were higher in the scenarios including spatial heterogeneity, as the relationships between the N inputs and these emissions are highly non-linear." @default.
- W1545559871 created "2016-06-24" @default.
- W1545559871 creator A5002566373 @default.
- W1545559871 creator A5010998250 @default.
- W1545559871 creator A5018605749 @default.
- W1545559871 creator A5091618812 @default.
- W1545559871 date "2004-01-01" @default.
- W1545559871 modified "2023-10-02" @default.
- W1545559871 title "Does modelling of spatial heterogeneity matter" @default.
- W1545559871 hasPublicationYear "2004" @default.
- W1545559871 type Work @default.
- W1545559871 sameAs 1545559871 @default.
- W1545559871 citedByCount "0" @default.
- W1545559871 crossrefType "journal-article" @default.
- W1545559871 hasAuthorship W1545559871A5002566373 @default.
- W1545559871 hasAuthorship W1545559871A5010998250 @default.
- W1545559871 hasAuthorship W1545559871A5018605749 @default.
- W1545559871 hasAuthorship W1545559871A5091618812 @default.
- W1545559871 hasConcept C109007969 @default.
- W1545559871 hasConcept C118518473 @default.
- W1545559871 hasConcept C127313418 @default.
- W1545559871 hasConcept C142724271 @default.
- W1545559871 hasConcept C151730666 @default.
- W1545559871 hasConcept C159390177 @default.
- W1545559871 hasConcept C180478619 @default.
- W1545559871 hasConcept C187320778 @default.
- W1545559871 hasConcept C18903297 @default.
- W1545559871 hasConcept C205649164 @default.
- W1545559871 hasConcept C2775835988 @default.
- W1545559871 hasConcept C2776133958 @default.
- W1545559871 hasConcept C2777904157 @default.
- W1545559871 hasConcept C2779179000 @default.
- W1545559871 hasConcept C2779370140 @default.
- W1545559871 hasConcept C39432304 @default.
- W1545559871 hasConcept C541528975 @default.
- W1545559871 hasConcept C64297162 @default.
- W1545559871 hasConcept C6557445 @default.
- W1545559871 hasConcept C71762439 @default.
- W1545559871 hasConcept C71924100 @default.
- W1545559871 hasConcept C76886044 @default.
- W1545559871 hasConcept C86803240 @default.
- W1545559871 hasConcept C88776829 @default.
- W1545559871 hasConcept C97137747 @default.
- W1545559871 hasConceptScore W1545559871C109007969 @default.
- W1545559871 hasConceptScore W1545559871C118518473 @default.
- W1545559871 hasConceptScore W1545559871C127313418 @default.
- W1545559871 hasConceptScore W1545559871C142724271 @default.
- W1545559871 hasConceptScore W1545559871C151730666 @default.
- W1545559871 hasConceptScore W1545559871C159390177 @default.
- W1545559871 hasConceptScore W1545559871C180478619 @default.
- W1545559871 hasConceptScore W1545559871C187320778 @default.
- W1545559871 hasConceptScore W1545559871C18903297 @default.
- W1545559871 hasConceptScore W1545559871C205649164 @default.
- W1545559871 hasConceptScore W1545559871C2775835988 @default.
- W1545559871 hasConceptScore W1545559871C2776133958 @default.
- W1545559871 hasConceptScore W1545559871C2777904157 @default.
- W1545559871 hasConceptScore W1545559871C2779179000 @default.
- W1545559871 hasConceptScore W1545559871C2779370140 @default.
- W1545559871 hasConceptScore W1545559871C39432304 @default.
- W1545559871 hasConceptScore W1545559871C541528975 @default.
- W1545559871 hasConceptScore W1545559871C64297162 @default.
- W1545559871 hasConceptScore W1545559871C6557445 @default.
- W1545559871 hasConceptScore W1545559871C71762439 @default.
- W1545559871 hasConceptScore W1545559871C71924100 @default.
- W1545559871 hasConceptScore W1545559871C76886044 @default.
- W1545559871 hasConceptScore W1545559871C86803240 @default.
- W1545559871 hasConceptScore W1545559871C88776829 @default.
- W1545559871 hasConceptScore W1545559871C97137747 @default.
- W1545559871 hasLocation W15455598711 @default.
- W1545559871 hasOpenAccess W1545559871 @default.
- W1545559871 hasPrimaryLocation W15455598711 @default.
- W1545559871 hasRelatedWork W1495827767 @default.
- W1545559871 hasRelatedWork W1588909114 @default.
- W1545559871 hasRelatedWork W1771018704 @default.
- W1545559871 hasRelatedWork W1980347338 @default.
- W1545559871 hasRelatedWork W1990770232 @default.
- W1545559871 hasRelatedWork W2041534218 @default.
- W1545559871 hasRelatedWork W2063105822 @default.
- W1545559871 hasRelatedWork W2063613693 @default.
- W1545559871 hasRelatedWork W2093521671 @default.
- W1545559871 hasRelatedWork W2111696952 @default.
- W1545559871 hasRelatedWork W2120934611 @default.
- W1545559871 hasRelatedWork W2129631781 @default.
- W1545559871 hasRelatedWork W2140907484 @default.
- W1545559871 hasRelatedWork W2143225633 @default.
- W1545559871 hasRelatedWork W2157304989 @default.
- W1545559871 hasRelatedWork W2380736359 @default.
- W1545559871 hasRelatedWork W2607177229 @default.
- W1545559871 hasRelatedWork W2824345322 @default.
- W1545559871 hasRelatedWork W2973659977 @default.
- W1545559871 hasRelatedWork W3144369226 @default.
- W1545559871 isParatext "false" @default.
- W1545559871 isRetracted "false" @default.
- W1545559871 magId "1545559871" @default.
- W1545559871 workType "article" @default.