Effect of Grazing and Mowing on the Micro Coenological Composition of a Semi - Arid Grassland in Hungary

Koncz, P.; Besnyoi, V.; Csathó, András István; Nagy, János; Szerdahelyi, Tibor; Tóth, Zsófia; Pintér, Krisztina; Balogh, János; Nagy, Zoltán; Bartha, Sándor

doi:10.15666/aeer/1202_563575

Cited by 17 publications

(21 citation statements)

References 14 publications

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“…A C4 grass (Cynodon dactylon) was also present in the study site potentially modifying the δ 13 C of the respired CO 2 . Its cover was about 10 % in the pasture (Koncz et al, 2014) but it was less frequent (i.e., less than 5 %) in the experimental area. Calculated uncertainties of the relative contributions of each components (rhizospheric, mycorrhizal fungi and heterotrophic) contain the uncertainty due to a possible 5 % contribution by the C4 grass.…”

Section: Uncertainty Assessmentmentioning

confidence: 86%

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Autotrophic component of soil respiration is repressed by drought more than the heterotrophic one in dry grasslands

Balogh¹,

Papp

Pintér

et al. 2016

Biogeosciences

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Abstract. Summer droughts projected to increase in central Europe due to climate changes strongly influence the carbon cycle of ecosystems. Persistent respiration activities during drought periods are responsible for a significant carbon loss, which may turn the ecosystem from a sink into a source of carbon. There are still gaps in our knowledge regarding the characteristic changes taking place in the respiration of the different components of the ecosystem in response to drought events.In the present study, we combined a physical separation of soil respiration components with continuous measurements of soil CO2 efflux and its isotopic (13C) signals at a dry grassland site in Hungary. The physical separation of soil respiration components was performed by means of inox meshes and tubes inserted into the soil. The root-excluded and root- and mycorrhiza-excluded treatments served to measure the isotopic signals of the rhizospheric, mycorrhizal fungi and heterotrophic components, respectively.In the dry grassland investigated in the study the three components of the soil CO2 efflux decreased at different rates under drought conditions. During drought the contribution made by the heterotrophic components was the highest (54 ± 8 %; mean ±SE). Rhizospheric component was the most sensitive to soil drying with its relative contribution to the total soil respiration dropping from 66 ± 7 (non-stressed) to 35 ± 17 % (mean ±SE) under drought conditions. According to our results the heterotrophic component of soil respiration is the major contributor to the respiration activities during drought events in the dry grassland ecosystem studied.

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Section: Uncertainty Assessmentmentioning

confidence: 86%

“…In order to estimate the uncertainty of the measurements and estimated contributions by the different components to the total soil respiration random errors of each factor (CO 2 concentrations, isotopic compositions, model fit errors and possible C4 contribution) were propagated by Gaussian error propagation (Lo, 2005).…”

Section: Uncertainty Assessmentmentioning

confidence: 99%

Autotrophic component of soil respiration is repressed by drought more than the heterotrophic one in dry grasslands

Balogh¹,

Papp

Pintér

et al. 2016

Biogeosciences

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“…1(b)). The vegetation of the sand grassland is diverse (species number over 80, Koncz et al 2014). For the last 20 years the site was extensively grazed by cattle, with a stocking density of 0.23-0.58 animal ha -1 .…”

Section: : Bugac (C1) -Tiszaalpár (C2)mentioning

confidence: 99%

Meta-analysis of field scale spatial variability of grassland soil CO2 efflux: Interaction of biotic and abiotic drivers

Fóti

Balogh

Herbst

et al. 2016

CATENA

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Abbreviations a -autocorrelation length, c -structural semivariance, DOY -day of year, DOYn -normalized day of year, ME -NashSutcliffe model efficiency coefficient, PCA -principal component analysis, psill -partial sill, R s -soil CO 2 efflux, sdstandard deviation, SSErr -residual sum of squares, SWC -soil water content, SWCn -normalized soil water content, TOCtotal organic carbon content, T s -soil temperature, y0 -nugget variance AbstractIn this study eight temperate grassland sites were monitored for soil CO 2 efflux (R s ) and the spatial covariates soil water content (SWC) and soil temperature (T s ) at fine scale in over 77 measurement campaigns. The goals of this multisite study were to explore the correlations between environmental gradients and spatial patterns of R s , SWC and T s , which are not site-specific and to quantify the relevance of biotic and abiotic controls over spatial patterns along increasing vegetation structural complexity. These patterns in water-limited ecosystems in East-Central Europe are likely to be influenced by summer droughts caused by the changing climate.A consistent experimental setup was applied at the study sites including 75 sampling locations along 15 m circular transects. Spatial data processing was mainly based on variography. Two proxy variables were introduced to relate the site characteristics in terms of soils, water status and vegetation. Normalized SWC (SWCn) reconciled site-specific soil water regimes while normalized day of year integrated temperature and vegetation phenology.A principal component analysis revealed that the progressing closure of vegetation in combination with large R s and SWCn values, as well as low T s and R s variability support the detectability of spatial patterns found in both the abiotic and biotic variables. Our results showed that apart from SWC the pattern of soil temperature also had an effect on spatial structures. We detected that when the spatially 2 structured variability of T s was low, a strong negative correlation existed between SWCn and the spatial autocorrelation length of R s with r=0.66 (p<0.001). However, for high spatially structured variability of T s , occurring presumably at low T s in spring and autumn, the correlation did not exist and it was difficult to quantify the spatial autocorrelation of R s . Our results are indicative of a potential shift from homogeneity and dominance of biotic processes to an increased heterogeneity and abiotic regulation in drought prone ecosystems under conditions of decreasing soil moisture.

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“…While meadows represent a relatively benign environment for most grassland plants in terms of disturbance, their comparatively high productivity involves high competition intensity for light. oceanic species are more sensitive to these rather physical stress components of land use that render pastures to experience a more exposed, "continental-like" microclimate (Jantunen 2003, Koncz 2014, T€ alle et al 2016). As hypothesized, the species of the continental range type performed less well in the benign but more competitive meadow situations than congeneric species of the oceanic range type.…”

Section: Discussionmentioning

confidence: 99%

“…oceanic species are more sensitive to these rather physical stress components of land use that render pastures to experience a more exposed, "continental-like" microclimate (Jantunen 2003, Koncz 2014, T€ alle et al 2016). This range-type-specific response to land-use practices is similar to the process described as "xerophytization" by Russian vegetation ecologists (Ramenskiy et al 1956), which, however, has not yet been considered in global change projections of range dynamics.…”

Section: Discussionmentioning

confidence: 99%

Plant species’ range type determines local responses to biotic interactions and land use

Welk

Baudis

et al. 2019

Ecology

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Citation: Welk, A., E. Welk, M. Baudis, J. B€ ockelmann, and H. Bruelheide. 2019. Plant species' range type determines local responses to biotic interactions and land use. Ecology 100(12):Abstract. Geographic plant distribution is often assumed to be predominantly limited directly by the climatic tolerances of species. However, the role of climate is now known to be mainly an indirect one mostly mediating dispersal and establishment, species interactions, or habitat characteristics, which all are often modified by human land use. In these complex systems, negative biotic interactions are predicted to increase in relative importance toward benign climatic conditions. We tested this hypothesis experimentally by exposing plant species with different geographic distribution ranges to different climates, biotic interactions, and land use. Thereby, species predominantly distributed in regions with benign climatic conditions were expected to be better able to cope with negative biotic interactions than species from regions with environmentally stressful climatic conditions. We present results of a fully crossed twoyear transplantation field experiment replicated in 45 plots in three study regions along a precipitation gradient across Germany. We manipulated biotic interactions (presence/absence of competition and mollusk herbivory) in grasslands of different management regimes (meadows, mown pastures, pastures). The transplanted phytometers consisted of six congeneric species pairs, each representing one oceanic and one distinctly more continental range type. The oceanic range type is predominantly distributed in benign climatic conditions in Western Europe, while the more continental type is distributed in regions with more stressful climatic conditions in Eastern Europe. This experimental setting allowed us to study the impact of negative biotic interactions along an abiotic stress gradient under realistic land-use conditions. Under competition and mollusk herbivory, growth performance was more strongly reduced in continental compared to oceanic species. Range types also differed in their responses to grassland management. Differences in survival between the congeneric species were found to be region-specific and largely unaffected by biotic interactions and land use. In consequence, our results suggest that local responses to biotic interactions and land-use practices of otherwise very similar plant species can differ strongly depending on species' large-scale geographical distribution. Regionally differing responses to biotic interactions also show that local conditions can drastically change responses expected from macroecological theory.

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Effect of Grazing and Mowing on the Micro Coenological Composition of a Semi - Arid Grassland in Hungary

Cited by 17 publications

References 14 publications

Autotrophic component of soil respiration is repressed by drought more than the heterotrophic one in dry grasslands

Autotrophic component of soil respiration is repressed by drought more than the heterotrophic one in dry grasslands

Meta-analysis of field scale spatial variability of grassland soil CO2 efflux: Interaction of biotic and abiotic drivers

Plant species’ range type determines local responses to biotic interactions and land use

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