The tall grass vegetation in the Andean grassland ecosystems covers the largest area compared to other types of vegetation such as Puna grass, wetland and others. The grasslands are frequently set on fire by livestock farmer, seriously affecting the ecosystem. One way to mitigate this problem is to use these species as a source of plant fibre, which can be economically useful to the interests of the livestock family without affecting the ecosystem. To advance in this approach, it is necessary to know the functional characteristics of the plants; therefore, we evaluated the aerial primary productivity, plant density per m 2 , basal cover, aerial cover and leaf height, whose data were analysed using the generalised linear mixed model and the correlation between these variables with the physical-chemical characteristics of the soil, by means of principal component analysis and canonical correlation, in seven species of grassland and seven control plots, located between 3860 and 4333 metres above sea level. The results showed significant differences for p=0.001 between species, and between plots, and a canonical correlation grouped in two clusters that showed the differentiated importance of soil elements with the phytomass produced

The quality of the aquatic environment of high Andean lagoons was evaluated by means of multivariate statistical methods in two contrasting climatic periods. The water samples and benthic macroinvertebrates were collected in 22 sampling sites during the rainy and dry seasons. In each lagoon DO, DTS, EC, temperature and pH were determined in situ. The results revealed that the physicochemical parameters comply with the environmental quality standards for water, except COD and BOD 5. In the PCA of the physicochemical parameters, the first two axes explained 73% of the total variation. The gradual analysis in pairs showed significant differences. The SIMPER analysis determined an average of four families of benthic macroinvertebrates per lagoon that showed more than 70% contribution. The ANOSIM revealed that Tragadero lagoon differs significantly from the others. The DistLM showed a value of 0.46 of coefficient of determination. Therefore, the quality of the environment of high Andean lagoons evaluated by means of multivariate statistical methods presents important differences or dissimilarities not only in the physicochemical characteristics of the water, but also in the composition of the benthic macroinvertebrate communities.

The Andean grassland ecosystems undergo natural and anthropogenic degradation processes. The change of land use for agricultural use is the greatest threat, with a great loss of biodiversity followed by a very slow process of revegetalization. The objective was to assess the richness, abundance and diversity, alpha and beta, in areas of two-, three-, five-, six- and eight years of post-harvest abandonment of Lepidium meyenni Walpers. Ten affected areas were selected for agrostological evaluation, through four linear transects of interception points with 100 records each, applied on the edge and inside the affected area, inside and outside the affected areas, as well as samples composed of soils for each area. Composite soil samples were collected from each transect and study area to analyze their physical and chemical properties. The data were analyzed using the generalized linear mixed model with Rstudio v 5.3.2, and the multivariate analysis of canonical correspondence between biological and environmental variables, using CANOCO v.1.4 software. A significant difference was found between floral composition and alpha diversity according to abandonment time and seasonal periods. The greatest richness and abundance was observed between five- and eight years of abandonment, due to the greater presence of perennial species. Linear correspondence of alpha richness and diversity with organic matter, nitrogen, soil phosphorus and abandonment time was observed.

El conocimiento de la flora y la utilidad de los humedales andinos para la ganadería es muy escaso, lo que llevó al interés de evaluar la diversidad florística, la productividad primaria neta aérea (PPNA), la condición ecológica y capacidad de carga para alpacas (CCA), en tres humedales de la subcuenca Shullcas en el Perú. Se realizó lectura florística en 10 cuadrantes distribuidos en transecto radial en cada humedal y en momentos típicos de las estaciones de lluvia y de seca. Se realizaron cortes de fitomasa en periodos regulares de 30, 60, 90 y 120 días. Se encontraron 14 familias de plantas vasculares con 33 géneros y 41 especies, el índice de diversidad Shannon Wiener fluctuó entre 2,28 ± 0,15 y 2,40 ± 0,17, la PPNA presentó variación entre los meses evaluados en un rango de 27,39 ± 33,73 a 97,86 ± 47,52 g materia seca (MS)/m 2, entre periodos de corte desde 132,12 ± 30,42 a 180,60 ± 32,89 g MS/m 2 y entre humedales desde 116,71 ± 34,6 a 192,18 ± 22,50 g MS/m 2 , todas ellas en condición ecológica buena; la CCA varió entre 1,38 ± 0,36 y 1,80 ± 0,40 alpacas/ha. El resultado obtenido sugiere que los humedales deben ser valorados por periodos frecuentes en el año en reemplazo de una sola vez. Palabras clave: humedal; diversidad florística; productividad primaria neta; condición ecológica; capacidad de carga animal.

El estudio tiene como objetivo evaluar la diversidad florística de los pastizales de montaña en cinco formaciones vegetales: tres pajonales y un césped de puna. Se utilizó el método de transección al paso modificado de Parker (1951). Se encontraron 22 familias, 52 géneros y 103 especies. Las Poaceae y la Asteraceae tuvieron mayor abundancia, las especies se ordenan en dos grupos. Los índices H' oscilan entre medio y alto (2,75 y 3,41) sin relación significativa con la cobertura del suelo. El género Calamagrostis tiene el mayor IVI: C. vicunarum (15,64), C. amoena (13,29), C. curvula (12,87). Los índices de Jaccard mostraron mayor similaridad entre las formaciones vegetales de pajonal de Festuca rígida y el de C. amoena (0,43), seguido por el pajonal de F. rígida y el de F. dolichophylla (0,42) y la relación entre el pajonal de F. rígida y del de Césped de puna tienen la menor similaridad (0,27). Palabras clave: Pastizal altoandino; índice de diversidad; tipo de vegetación; riqueza; ecosistemas de montaña.