Analysis of a 30-year rainfall record (1967-1997) in semi-arid SE Spain for implications on vegetation

In order to understand the behaviour of ecosystems in semi-arid areas, rainfall must be analysed over time. For this reason, statistical methods were applied to a rainfall time-series (1967–1997) in a typical Mediterranean semi-arid area in SE Spain of great ecological interest. Annual, seasonal and monthly time scales were studied, including rainfall volume, number of rain-days and one-day maximum rainfalls. Results showed neither trends nor abrupt changes in the series, although three periods, averaging 301, 183 and 266 mm year−1respectively were observed from fluctuation in rainfall. Modal values of annual and monthly rainfalls were lower than average. Inter-annual variability was 36% and intra-annual variability up to 207%. Although there was often a rainfall maximum in autumn and a minimum in July, the only certainty was a summer drought, which marking strong annual cycles. The estimated return periods for events of more than 50, 70 and 100 mm day−1were over 5, 11 and 30 years respectively; the absolute maximum 1-day rainfall recorded was 98 mm. Results suggest that vegetation is not only adapted to the amount of precipitation, but also to its timing. All types of rainfall, in terms of volume and timing, would have consequences for vegetation.

[1]  R. Sneyers On the statistical analysis of series of observations. , 1991 .

[2]  Elizabeth M. Shaw,et al.  Hydrology in Practice , 1983 .

[3]  F. Woodward Climate and plant distribution , 1987 .

[4]  A. Calvo-Cases,et al.  Morphology and Development of Selected Badlands in Southeast Spain: Implications of Climatic Change , 1996 .

[5]  R. Kinerson,et al.  Primary Productivity and Water Use in Native Forest, Grassland, and Desert Ecosystems , 1978 .

[6]  M. Bertiller,et al.  Seasonal environmental variation and plant phenology in arid Patagonia (Argentina) , 1991 .

[7]  Juan Puigdefábregas,et al.  Measurement and modelling of rainfall interception by three semi-arid canopies , 1998 .

[8]  Juan Puigdefábregas,et al.  Evapotranspiration model for semi-arid shrub-lands tested against data from SE Spain , 1999 .

[9]  Z. Naveh The dependence of the productivity of a semi-arid mediterranean hill pasture ecosystem on climatic fluctuations , 1982 .

[10]  I. Noy-Meir,et al.  Desert Ecosystems: Environment and Producers , 1973 .

[11]  H. Mooney,et al.  The Behaviour of Larrea Divaricata (Creosote Bush) in Response to Rainfall in California , 1969 .

[12]  E. Schulze,et al.  Experimentell-ökologische Untersuchungen an Flechten der Negev-Wüste: II. CO2-Gaswechsel und Wasserhaushalt von Ramalina maciformis (Del.) Bory am natürlichen Standort während der sommerlichen Trockenperiode , 1970 .

[13]  J. J. Molina El clima de la provincia de Almería , 1977 .

[14]  O. Sala,et al.  Root Profiles and the Ecological Effect of Light Rainshowers in Arid and Semiarid Regions , 1985 .

[15]  Matthias M. Boer,et al.  Differential responses of hillslope and channel elements to rainfall events in a semi-arid area , 1998 .

[16]  H. Storch,et al.  Analysis of Climate Variability , 1995 .

[17]  André Berger,et al.  Annual and seasonal climatic variations over the northern hemisphere and Europe during the last century , 1986 .

[18]  M. Barbour Age and Space Distribution of the Desert Shrub Larrea Div Aricata , 1969 .

[19]  A. Flores,et al.  Recursos naturales y medio ambiente en el sureste peninsular , 1997 .

[20]  Matthias M. Boer,et al.  Evaluating the long-term water balance of arid zone stream bed vegetation using evapotranspiration modelling and hillslope runoff measurements , 2001 .

[21]  S. Bamberg,et al.  Phenological Studies in the Mojave Desert at Rock Valley (Nevada Test Site) , 1974 .

[22]  J. C. Beatley Survival of Winter Annuals in the Northern Mojave Desert. , 1967, Ecology.

[23]  Susana Nieto,et al.  Spatial and temporal patterns of annual precipitation variability over the Iberian Peninsula , 1998 .

[24]  Le Houérou,et al.  Rain use efficiency: a unifying concept in arid-land ecology , 1984 .

[25]  J. B. Thornes,et al.  Mediterranean desertification and land use. , 1996 .

[26]  T. L. Ackerman Germination and Survival of Perennial Plant Species in the Mojave Desert , 1979 .

[27]  Christian Floret,et al.  Measurement and modelling of primary production and water use in a south Tunisian steppe , 1982 .

[28]  H. Neumann El clima del sudeste de España , 1960 .

[29]  F. Pugnaire,et al.  Seed production and dispersal in the semi-arid tussock grassStipa tenacissimaL. during masting , 1995 .

[30]  F. W. Went,et al.  Ecology of Desert Plants. I. Observations on Germination in the Joshua Tree National Monument, California , 1948 .

[31]  W. Parton,et al.  Primary Production of the Central Grassland Region of the United States , 1988 .

[32]  N. Dalezios,et al.  Daily precipitation variability in semiarid agricultural regions in Macedonia, Greece , 1995 .

[33]  José Manuel Castillo Requena El clima de Andalucía , 2000 .

[34]  H. L. Houérou,et al.  Relationship between the variability of primary production and the variability of annual precipitation in world arid lands , 1988 .

[35]  M. Türkeş,et al.  SPATIAL AND TEMPORAL ANALYSIS OF ANNUAL RAINFALL VARIATIONS IN TURKEY , 1996 .

[36]  K. Trenberth Climate And Climatic Change , 1977 .

[37]  L. Lane,et al.  Water balance calculations and net production of perennial vegetation in the northern Mojave Desert. , 1984 .

[38]  F. Rodrigo,et al.  Estudio de variaciones climáticas en Almería , 1997 .

[39]  H. Lieth Phenology and Seasonality Modeling , 1974, Ecological Studies.

[40]  L. Kappen,et al.  Water and plant life : problems and modern approaches , 1976 .

[41]  F. Turner,et al.  Net production by shrubs and winter annuals in Southern Nevada , 1989 .

[42]  A. Specht,et al.  Canopy structure in Eucalyptus-dominated communities in Australia along climatic gradients , 1989 .

[43]  R. Alexander,et al.  Vegetation Mapping: From Patch to Planet , 2000 .

[44]  M. Mulligan Modelling the geomorphological impact of climatic variability and extreme events in a semi-arid environment , 1998 .

[45]  R. Bryan,et al.  Analysis of the monthly and annual rainfall climate in a semi-arid environment, Kenya , 1991 .

[46]  J. C. Beatley Phenological Events and Their Environmental Triggers in Mojave Desert Ecosystems , 1974 .

[47]  G. Pickup,et al.  Problems, prospects and procedures for assessing the sustainability of pastoral land management in arid Australia , 1993 .

[48]  H. Lieth The Use of Correlation Models to Predict Primary Productivity from Precipitation or Evapotranspiration , 1976 .

[49]  Folkwin Geiger El Sureste español y los problemas de la aridez , 1973 .

[50]  M. J. Esteban‐Parra,et al.  Spatial and temporal patterns of precipitation in Spain for the period 1880–1992 , 1998 .

[51]  L. B. Leopold,et al.  Water In Environmental Planning , 1978 .

[52]  M. C. Rutherford Annual plant production-precipitation relations in arid and semi-arid regions , 1965 .

[53]  Kevin McConway,et al.  Rainfall, Biomass Variation, and Community Composition in the Park Grass Experiment , 1994 .