Does extensification of rich grasslands alter the C and N cycles, directly or via species composition?

Loiseau, P; Louault, Frédérique; Roux, Xavier Le; Bardy, Maéva

doi:10.1016/j.baae.2004.07.006

Cited by 32 publications

(18 citation statements)

References 26 publications

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“…The fungal-fed decomposition pathway appeared more important in the low-grazing preexperimental intensity grassland than in that subjected to high-grazing intensity. This is in accordance with observations that disturbed grassland soils tend to develop a faster decomposition pathway by promoting opportunist/competitive plant species that fuel a regular/faster return of nutrient-rich dead organic matter to the soil (Lavorel et al, 2004;Loiseau et al, 2005). Since the CI difference was mainly due to a difference in abundance of bacterivorous Rhabditidae, we would hypothesise that Rhabditidae may indicate the faster nutrient dynamic that occurred in the pre-experimental high grazing grassland.…”

Section: Effect Of the Past Grazing Regimesupporting

confidence: 84%

Grassland management history affects the response of the nematode community to changes in above-ground grazing regime

Villenave

Saj

Attard

et al. 2011

Nematol

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Changes in grassland management induce disturbances that influence both soil functioning and soil fauna. This study aimed at determining the extent to which the composition of a grassland soil nematode community could be altered by a shift of grazing regime and the potential feedback that these alterations could provoke on grassland functioning. Therefore, we monitored the composition of the soil nematode community (i.e., plant-, bacterial- and fungal-feeders, omnivores and carnivores) of mesocosms that were sampled from two contrasted long-term field trials (high vs low grazing treatments) and subsequently subjected to high or no grazing for 2 years. The soil nematofauna responded faster and more strongly to the application of an intensive grazing regime on a previously extensively exploited system than the other way round. The application of an intensive grazing regime induced a significant increase in numbers of bacterial feeders and a decrease of the relative abundance of fungal-feeding nematodes. The nematofaunal community structure was determined by both the past and current grazing regimes throughout the 2 years of monitoring. Observed effects on soil microbivores seemed to reflect the 'immediate' above-ground primary production potential and to follow micro-organism dynamics. On the other hand, observed effects on root-feeding nematodes seemed to reflect the integral effect of past and current grazing regimes on plant community root biomass and quality. (Résumé d'auteur

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Section: Effect Of the Past Grazing Regimesupporting

confidence: 84%

Grassland management history affects the response of the nematode community to changes in above-ground grazing regime

Villenave

Saj

Attard

et al. 2011

Nematol

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“…It has also been shown that legumes and forbs are strongly disadvantaged by biomass accumulation, owing to a decrease in stocking density (Dumont et al 2011). This impacts not only on the litter quantity, but also litter quality, thereby affecting soil biota and nutrient cycling (Wardle et al 2004;Loiseau et al 2005).…”

Section: Introductionmentioning

confidence: 99%

How does soil particulate organic carbon respond to grazing intensity in permanent grasslands?

Herfurth

Vassal

Louault³

et al. 2015

Plant Soil

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Background and aims Modification in grazing intensity causes functional changes in permanent grasslands, e.g. in carbon (C) cycling. However, we still know little about how the soil organic C of permanent grasslands responds to grazing intensity. Methods In a grassland experiment with three levels of grazing intensity, we monitored root and rhizome C stocks, particulate organic C stocks, total soil C stocks, above-ground net primary production and plant species groups abundance over 7 years. A simple model was used to estimate the mortality of roots and rhizomes, decomposition rates of particulate organic C, and C fluxes under different grazing intensities. Results After 7 years, low grazing intensity and no grazing led to a modification in above-ground vegetation (production, plant species composition, nitrogen content) and a reduction in C transferred between roots and particulate organic matter fractions, while the C stocks of root and rhizomes, particulate organic matter and total soil were not significantly affected by grazing intensity. However, particulate organic C showed a strong interannual variability.Conclusion Particulate organic C could have reacted more slowly than expected to changes in grazing intensity, or a marked interannual variability of particulate organic C stocks, through an increase in decomposition rates in all the grazing treatments, could have slowed down the accumulation of particulate organic C and masked the effect of the grazing intensity treatments.

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“…water (Moeslund et al, 2013). For example, soil moisture has been demonstrated to affect the amount of nitrogen available to plants through its impact on mineralization rates (Giesler et al, 1998;Loiseau et al, 2005). The introduction of legumes can also greatly affect soil moisture dynamics in these areas (Zeng et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Factors affecting the recovery of abandoned semi-arid fields after legume introduction on the Loess Plateau

Yuan

Epstein

2015

Ecological Engineering

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Does extensification of rich grasslands alter the C and N cycles, directly or via species composition?

Cited by 32 publications

References 26 publications

Grassland management history affects the response of the nematode community to changes in above-ground grazing regime

Grassland management history affects the response of the nematode community to changes in above-ground grazing regime

How does soil particulate organic carbon respond to grazing intensity in permanent grasslands?

Factors affecting the recovery of abandoned semi-arid fields after legume introduction on the Loess Plateau

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