Abstract
In the last years, in the semi-arid central region of Argentina, the increase of C3 non-palatable native grass species known generally as “pajas” was observed. One possible cause of the success of these species is the increase in rainfall observed in the region in recent years. The objective of this work was to evaluate the effect of a greater water availability and its seasonal distribution on the biomass and the production of reproductive structures of a non-palatable and highly invasive C3 species ( Jarava ichu ) and a non-palatable C4 species ( Setaria lachnea ). For this, a greenhouse experiment was carried out, consisting in manual irrigation of individuals of both species in pots. Treatments were: dry year, wet year with autumnal peak and wet year with spring peak. The increase in water availability favored the biomass of leaves and stems of J. ichu , independently of the seasonal distribution, with respect to the dry year. On the contrary, the biomass of S. lachnea did not respond to the different treatments (P>0.05). Likewise, the number of panicles was greater for J. ichu under the wet year treatment with spring peak, but there were no differences for S. lachnea . https://doi.org/10.25260/EA.19.29.1.0.763
Highlights
Effect of the availability of water on an invasive grass of the Caldenal Region
The objective of this work was to evaluate the effect of a greater water availability and its seasonal distribution on the biomass and the production of reproductive structures of a non-palatable and highly invasive C3 species (Jarava ichu) and a non-palatable C4 species (Setaria lachnea)
The increase in water availability favored the biomass of leaves and stems of J. ichu, independently of the seasonal distribution, with respect to the dry year
Summary
En la región semiárida central argentina se observó el incremento de especies gramíneas nativas no palatables C3 conocidas generalmente como “pajas”. Una causa posible del éxito de estas especies es el aumento de las precipitaciones observado en la región en los últimos años. El objetivo de este trabajo fue evaluar el efecto de una mayor disponibilidad de agua y su distribución estacional sobre la biomasa y la producción de estructuras reproductivas de una especie C3 no palatable y altamente invasiva (Jarava ichu), y una especie C4 no palatable (Setaria lachnea). El aumento de la disponibilidad de agua favoreció la biomasa de hojas y tallos de J. ichu independientemente de la distribución estacional, con respecto al año seco. El número de panojas fue mayor para J. ichu bajo el tratamiento año húmedo con pico primaveral, pero no se detectaron diferencias para S. lachnea
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