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sur le développement des zones arides et semi-arides

Titre : Restitución de la composición florística en campo de pastoreo en sucesión secundaria mediante propagación vegetativa de pastos deseables en INIA Illpa - Puno

Auteur : Mamani Calsina, Cristian

Université de soutenance : Universidad Nacional Del Altiplano

Grade : INGENIERO AGRÓNOMO 2018

Résumé
The study was carried out in the Estacion Experimental Agraria Illpa of the Instituto Nacional de Innovacion Agraria - INIA, located at 3818 meters above sea level, district of Paucarcolla, province and department of Puno. With the objective of determining the influence of the closure and planting of the cuttings of desirable native grass species in the grazing field in the restitution of floristic composition and plant cover, which was carried out from February 2017 to January ; with a duration of one year of evaluation of the response variables ; for which the experimental design of Completely Randomized Block was used. The results obtained were : The highest percentage of capture, persistence, regrowth was achieved with the species Festuca dolichophilla 99.67%, 92.97% and 98.23%, followed by Poa gilgiana 95%, 90.60% and 96.30%, respectively. In the initial floristic composition, 12% of desirable species were found, 15.66% of undesirable species, 10.33% of undesirable species and no forage value 62% ; while the closure and planting increase the final floristic composition to 17.70% of desirable species, decrease to 12.26% of undesirable species and increase of undesirable species to 19.1%, without forage value decreased 23% and the contribution of the plantation is 28 %. In revegetation ; Medicago hispida obtained 59.67% of presence, followed by Alchemilla pinnata with 38.67% and Trifolium amabile with 33.0% ; that outperformed the other species studied. The height of the plant shows that Medicago hispida reached 29.40 cm, followed by Poa gilgiana with 28.53 cm, during the capture phase ; in the persistence phase the Poa gilgiana species reached 18.87 cm and Medicago hispida 6.37 cm and in the regrowth phase ; Festuca dolichophilla had 24.00 cm, followed by Poa gilgiana 22.43 cm. With regard to the estimate of plantation cost per hectare of native grass species, the tall grasses (Festuca dolichophylla and Poa gilgiana) obtained a total cost of S /. 7010.2, which exceeded the other species studied.

Mots clés Propagation, Vegetative, Cuttings, Native pastures, succession

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