Relationships between soil chemical parameters and functional plant groups in fertility islands of the Arid Chaco (Argentina)
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Abstract
The “fertility islands” are the result of soil particles, water, nutrients, and biomass accumulation under their canopy. The study of soil and plant parameters in fertility islands is important for the redefinition of management strategies. The hypothesis is that Neltuma flexuosa and Larreadivaricata fertility islands in the Arid Chaco improve soil chemical properties under their canopies affecting the quality and quantity of forage. The objective is to evaluate soil chemical properties on the response of plants in fertility islands. The effect of nurse plants over soil chemical properties and their relation with functional plant groups was studied. Livestock carrying capacity (LCC) significantly increased under the canopy of N. flexuosa. Decreasers were positively related to the N. flexuosa canopy, and negatively to L. divaricata canopy. Soil organic carbon (OC) related positively with decreasers in N. flexuosa islands, but negatively in L. divaricata islands where there seems to exist allelopathy effect. Extractable phosphorus correlated positively with decreasers.
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