Distribution of plant life forms along an altitudinal gradient in the semi‐arid valley of Zapotitlán, Mexico

Pavón, Numa P.; Hernández-Trejo, Humberto; Rico-Gray, Víctor

doi:10.2307/3236773

Cited by 63 publications

(60 citation statements)

References 19 publications

(19 reference statements)

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“…En general, se ha sugerido una correlación positiva siempre y cuando las especies tengan una historia evolutiva común en suelos de pH alto (Pärtel, 2002), lo que podría ser el caso de este trabajo. Para el Valle del Mezquital se reportaron valores de pH entre 7.2 y 7.3 (Montaño-Árias et al, 2006) y para el semidesierto de Tehuacán-Cuicatlán de 7.3 a 8.4 (Pavón, Hernández-Trejo, & Rico-Gray, 2000), mientras que en este estudio encontramos sitios con pH ligeramente ácidos de 5.8. Desconocemos si esto es una condición natural de los sitios o es derivado de actividades humanas; por ello es necesario realizar estudios para una evaluación apropiada.…”

Section: Resultsunclassified

Diversity of Shrub Species in a Semiarid Area of Central Mexico

Gelviz-Gelvez¹,

Hernández²

2013

rchscfa

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RESUMENL a diversidad alfa (verdadera) y la diversidad beta (recambio y anidamiento) de especies arbustivas se evaluaron en la zona semiárida del estado de Hidalgo, México. El índice de valor de importancia de las especies se relacionó con variables edáficas y elementos climáticos. Se reportan 46 especies arbustivas pertenecientes a 21 familias, entre las que sobresalen Asteraceae y Fabaceae. El mayor número de especies efectivas registradas en un sitio fue de 7.8 y el menor de 1.6. La diversidad beta fue alta (0.9), lo cual se explica principalmente por el recambio de especies entre sitios (0.87) y en menor medida por el anidamiento (0.38). Las variables ambientales que mejor explicaron la distribución de las especies fueron la precipitación, el porcentaje de arena, el pH y el nitrógeno. Los resultados coinciden con lo documentado en otras zonas semiáridas, donde la alta diversidad regional se debe a un alto recambio de especies generado por la heterogeneidad ambiental que se muestra como un mosaico de condiciones, tanto de los elementos climáticos como de las características edáficas. ABSTRACTT he alpha diversity (true diversity) and beta diversity (turnover and nestedness) of shrub species were evaluated in the semiarid area of Hidalgo, Mexico. The importance value index of species was related to soil variables and climatic factors. We found 46 species from 21 families. Asteraceae and Fabaceae were the most important. The greatest number of effective species recorded was 7.8 and the smaller was 1.6. Beta diversity was high (0.9), mainly due to the turnover component (0.87) and to a lesser extent due to nestedness (0.38). Precipitation, nitrogen, pH and percentage of sand were the most important variables to explain the species distribution. These results agree with those reported in other semiarid areas. High regional diversity is due to a high species turnover generated by environmental heterogeneity that is displayed as a mosaic of conditions, both climatic and soil characteristics.

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Section: Resultsunclassified

Diversity of Shrub Species in a Semiarid Area of Central Mexico

Gelviz-Gelvez¹,

Hernández²

2013

rchscfa

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“…The relationship between the occurrence of different life forms, altitude and other environmental variables is well-known (Campbell & Werger 1988;Floret et al 1990;Montana & Valientebanuet 1998;Kessler 2000;Pavón et al 2000;Noy-Meir & Oron 2001;Klimeš 2003;Odland 2009). Hemicryptophytes have been found to be more frequent at higher altitudes in many mountain systems (Raunkiaer 1934;Wang et al 2002;Klimeš 2003;Noroozi et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Relationships between environmental variables and vegetation across mountain wetland sites, N. Iran

et al. 2010

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Abstract:The mountain wetlands studied represent a unique habitat on the southern slopes of the Alborz mountain range, the second largest range in Iran. In comparison with other parts of this range the western section is ecologically and botanically unknown. Floristic and vegetation variation were assessed using diverse environmental variables along a broad altitudinal span (350 m to 3200 m a.s.l.). Using both statistical and ordination analyses floristic variation was assessed on three defined altitudinal belts which were delimited based on Alborz macro-climatic boundaries. The distribution of individual wetland plant species, of phytogeographic elements and of life-forms all differ among altitudinal belts. This result is also shown in both direct and indirect analyses of ordinations. The proportion of geophytes significantly increases with altitude and geophytes are very well represented in the upper altitudinal belt. The number of species of a narrow phytogeographical distribution (e.g. endemics) increases with altitude, soil pH and EC declined with altitude. The first axis of DCA ordination with passively projected environmental variables indicates that, organic matter and concentration of Fe 2+ are increased toward higher altitude. The second axis of ordination is related to both soil texture and slope inclination. The distribution of species in the CCA species plot is also close to the distribution of those in the DCA ordination. This study indicates that altitude and slope together with other dependent environmental variables (pH, EC, Ca 2+ and soil texture) are the main ecological factors controlling species distribution across the Western Alborz wetland sites.

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“…Kharkwal et al (2005) have also suggested that altitude and climatic conditions such as temperature and rainfall are the determinants of species richness. The life-forms diversity usually decreases with increasing altitudes and one or two life-form remains at extreme altitudes (Pavon et al 2000;Sharma et al 2009). Austin et al (1996), have analyzed association between of species richness, climate, slope and soil nutrient status.…”

Section: Discussionmentioning

confidence: 99%

Altitudinal Variation in Species Composition and Soil Properties of Banj Oak and Chir Pine Dominated Forests

Kumar¹,

Singh²,

Bhat³

et al. 2013

Journal of Forest and Environmental Science

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The study was carried out in two different forest types viz., Banj oak and Chir pine forests to assess the variation in forest species composition and soil properties along altitudinal gradients in the Garhwal Himalayas. The results of the study showed that between the forests soil moisture was higher in Banj oak forest because of closed canopy and dense forest compared to Chir pine forest. The sand particles were reported higher in Banj oak forest which might be due to the addition of organic matter favouring coarse structure of soil, helping in holding maximum water in soils. However in the Chir pine forest low amount of soil organic matter and presence of clayey soil, develops soil compactness which reduces the penetration of water resulting in high soil bulk density. The higher accumulation of litter and presence of moisture in Banj oak forest favours higher nutrient level of nitrogen, phosphorus and potassium compared to Chir pine forest. The soil organic carbon also reduced with increasing altitude at both gradients. While bulk density has reverse trend with soil organic carbon in both the forests at different peaks of same region. In Banj oak forest, the highest density and total basal cover was reported 1,100 tree ha -1 and 58.86 m 2 ha -1 respectively. However, the highest values of density and total basal cover of Chir pine forest was 560 tree ha -1 and 56.94 m 2 ha -1 respectively.The total density and basal cover of both the forests reduced with increasing altitude. The study concludes that Banj oak forest has better nutrient cycling ability, well developed forest floor and has a greater protective and productive features compared to the Chir pine forest which is without lower vegetation cover and having only pine litter accumulation which does not allow any other species to grow.

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Distribution of plant life forms along an altitudinal gradient in the semi‐arid valley of Zapotitlán, Mexico

Cited by 63 publications

References 19 publications

Diversity of Shrub Species in a Semiarid Area of Central Mexico

Diversity of Shrub Species in a Semiarid Area of Central Mexico

Relationships between environmental variables and vegetation across mountain wetland sites, N. Iran

Altitudinal Variation in Species Composition and Soil Properties of Banj Oak and Chir Pine Dominated Forests

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