Plant growth and survival of five introduced and two native/naturalized perennial grass genotypes exposed to two defoliation managements in arid <scp>A</scp>rgentina

Torres, Yanina Alejandra; Busso, Carlos; Montenegro, Oscar Alberto; Ithurrart, Leticia Soledad; Giorgetti, Hugo Dosindo; Rodríguez, Gustavo Dionisio; Bentivegna, Diego Javier; Brevedan, R. E.; Fernández, Osvaldo Alberto; Mujica, María de la Merced; Baioni, Sandra Sonia; Entio, Lisandro José; Fioretti, M. N.; Tucat, Guillermo

doi:10.1111/gfs.12071

Cited by 9 publications

(6 citation statements)

References 32 publications

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“…This helps to explain the low ANPP of the WSPG in most disturbance types and study years. The introduction of WSPG which are a food constraint for grazing cattle and sheep constitutes an unsolved, critical challenge to date in arid, northeastern rangelands of Patagonia (Torres et al, 2013). The great contribution of CSAG to total ANPP in the Old Field 1 and Overgrazing disturbance types is coincident with the state-and-transition model reported by Distel and Bóo (1996).…”

Section: Functional Groupsmentioning

confidence: 61%

Aboveground Net Primary Productivity and Cover of Vegetation Exposed to Various Disturbances in Arid Argentina

Busso¹

2016

Appl Ecol Env Res

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Abstract. We contrasted total herbaceous ANPP and cover between various disturbance types (Control, Burning, Shrub Control, Old Field 1, Old Field 2, Overgrazing) at a functional group (CSPG= coolseason perennial grasses; WSPG= warm-season perennial grasses; CSAG + D= cool-season annual grasses + dicots) and a species scale during [1984][1985][1986][1987][1988][1989][1990][1991][1992]. Results showed that (1) precipitation appeared to be more important than disturbance type in determining total ANPP (CSPG + WSPG + CSAG + Dicots); (2) CSPG made the greatest (P<0.05) contribution to ANPP and plant cover compared with that made by the other two functional groups in all disturbance types and years; (3) the preferred, late-seral Nassella clarazii and Poa ligularis showed a greater (P<0.05) ANPP than the earlier-seral, intermediate Pappostipa speciosa and non-preferred Amelichloa ambigua and N. trichotoma in 23 out of 27 comparisons in the Control, Burning and Shrub Control disturbance types. In the Old Field 1, Old Field 2 and Overgrazing disturbance types, however, N. clarazii, P. ligularis, P. speciosa, A. ambigua and N. trichotoma showed a similar (P>0.05) ANPP most of the times during 1984-1992; (4) Total plant cover of CSAG+D was most often greater (P<0.05) than that of WSPG at the Old Field 1 and Overgrazing disturbances.

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Section: Functional Groupsmentioning

confidence: 61%

Aboveground Net Primary Productivity and Cover of Vegetation Exposed to Various Disturbances in Arid Argentina

Busso¹

2016

Appl Ecol Env Res

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“…This was because it was compacted as a result of previous studies. 39,40 With the purpose of having a loose soil, weed control and soil aeration, tillage was conducted twice. In addition, the soil was further cleaned twice with a rake, and also twice using a cultivator.…”

Section: Transplanting Of Plants To the Experimental Plotsmentioning

confidence: 99%

Species identity, richness and developmental stage of morphology affect enzymatic activity of the soil microorganisms in arid Patagonia, Argentina

Cardillo¹,

Busso²,

Ambrosino³

et al. 2019

BIJ

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Microbial communities are a key for terrestrial ecosystem functioning. However, their responses to changes in plant species identity and richness, and stages of developmental morphology have been rarely investigated. The objective of this study was to evaluate the impact of the identity, richness and stage of developmental morphology of plant species on soil microbial communities throughout the enzymatic activity of the dehydrogenase. Studies were conducted under wild, field conditions, and on field experimental plots having different species richness. Treatments included a control (intraspecific monocultures) or combinations of 2, 4, or 6 species pertaining to different functional groups (i.e., perennial either grasses or herbaceous dicots or shrubs). The grass Nassella tenuis and the shrub Larrea divaricata showed a lower (p<0.05) activity of the dehydrogenase than most of the other studied species under wild, field conditions. The enzymatic activity of the dehydrogenase was either similar or greater (p<0.05; e.g., Amelichloa ambigua, L. divaricata), but not lower, as species richness increased in the reproductive stage of developmental morphology. Finally, the dehydrogenase activity was in general greater (p<0.05) at the reproductive (late spring) than vegetative (late fall) stage of developmental morphology in all studied species. These results indicate that species identity, richness and stage of developmental morphology might be important determinants of the degree of microbial activity in the soil.

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“…This was because it was compacted as a result of previous studies. 41,42 With the purpose of having a loose soil, weed control and soil aeration, tillage was conducted twice. In addition, the soil was further cleaned twice with a rake, and also twice using a cultivator.…”

Section: Transplanting Of Plants To the Experimental Plotsmentioning

confidence: 99%

Plant species identity and richness influence microbial respiration of soil microorganisms on various functional groups in northeastern Patagonia, Argentina

Cardillo¹,

Busso²,

Ambrosino³

et al. 2018

BIJ

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Studies on basal soil respiration (i.e., under undisturbed conditions) are very important because they can be used as indirect indicators of the biological activity in those soils; this ecological process is recognized as the major source of carbon flux from the soil surface, and one of the crucial components of the carbon cycle in terrestrial ecosystems. The objectives of this study were to determine the microbial respiration of soil microorganisms at various levels of plant species richness and developmental morphology stages in various perennial grass (Nassella longiglumis, N. tenuis, Amelichloa ambigua), and herbaceous (Atriplex semibaccata) and woody (Larrea divaricata, Schinus fasciculatus) dicots grown in experimental plots during 2013 and 2014. There were 54 experimental plots. On each of 6 blocks, there was a plot (1.25x1.25m) for each of the 6 species (monocultures) and one plot each having combinations of 2, 4 or 6 species. Six hundred and twenty nine plants were reserved to replace dead plants in the plots [629+1944 plants from the plots (54 plots x 36 plants per plot)=2573 plants in total]. An auger (3 cm diameter, 20 cm length), was used to obtain six replicate root + soil samples at each of four sampling times during those years. Basal soil respiration was similar (p>0.05) or greater (p<0.05), but ever lower, as plant species richness increased. Our results demonstrated that the plant species differences in microbial respiration in the experimental plots were species richness-, developmental morphology stage-, and sampling-time dependents.

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Plant growth and survival of five introduced and two native/naturalized perennial grass genotypes exposed to two defoliation managements in arid Argentina

Cited by 9 publications

References 32 publications

Aboveground Net Primary Productivity and Cover of Vegetation Exposed to Various Disturbances in Arid Argentina

Aboveground Net Primary Productivity and Cover of Vegetation Exposed to Various Disturbances in Arid Argentina

Species identity, richness and developmental stage of morphology affect enzymatic activity of the soil microorganisms in arid Patagonia, Argentina

Plant species identity and richness influence microbial respiration of soil microorganisms on various functional groups in northeastern Patagonia, Argentina

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