Summary
Small precipitation events account for a large proportion of the precipitation received in semiarid regions, and their potential ecological importance has previously been ignored. We investigated the effect of a small rainfall event (5 mm) upon Bouteloua gracilis, the dominant grass species of the central and southern Great Plains of North America. An effect of a small event on leaf water potential and leaf conductance to water vapor was observed in less than 12 h and lasted for up to two days.
The remarkable short response time of Bouteloua gracilis to a rainfall stimulus enables this species to utilize small events and, therefore, may influence its persistence as a dominant species in the steppe region.
We proposed response times to be one of the major species characteristics determining capacity for utilizing different portions of the water resource of the region. We suggest that small precipitation events are ecologically significant and a qualitatively distinct resource for ecosystems in semiarid regions.
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References
Armijo JD, Twitchell GA, Burman RD, Nunn JR (1972) A large, undisturbed weighing lysimeter for grassland studies. Am Soc Agr Eng Trans 15:827–830
Bailey HP (1979) Semi-arid climates: Their definition and distribution. In: Hall AE, Cannell GH, Lawton HW (eds) Agriculture in semiarid environments. New York, Springer-Verlag, pp 73–96
Bertolin G, Rasmussen J (1969) Preliminary report on the study of the precipitation on the Pawnee National Grasslands. U.S. Internat'l. Grassland Biome Techn Rep No. 17. Colorado State Univ, Fort Collins, p 48
Boyer JS (1971) Recovery of photosynthesis in sunflower after a period of low leaf water potential. Plant Physiol 47:816–820
Clark FE (1977) Internal cycling of 15nitrogen in shortgrass prairie. Ecology 58:1322–1333
Cole CV, Innis GS, Stewart JWB (1977) Simulation of phosphorus cycling in semiarid grasslands. Ecology 58:1–15
Coupland RT (1950) Ecology of mixed prairie in Canada. Ecol Monogr 20:271–315
Fereres E, Cruz Romero G, Hoffman GJ, Rawlins SL (1979) Recovery of orange trees following severe water stress. J Appl Ecol 16:833–842
Kanemasu ET, Thurtell GA, Tanner CB (1969) Design, calibration and use of a stomatal diffusion porometer. Plant Physiol 44:881–885
Lauenroth WK, Dodd, JL, Sims PL (1978) The effects of water and nitrogen-induced stresses on plant community structure in a semiarid grassland. Oecologia 36:211–222
Ludlow MM, Ibaraki K (1979) Stomatal control of water loss in siratro (Macroptilium atropurpureum (DC) Urb.), a tropical pasture legume. Ann Bot 43:639–647
Ludlow MM, Ng TT, Ford CW (1980) Recovery after water stress of leaf gas exchange in Panicum maximum var trichoglume. Aust J Plant Physiol 7:299–313
McMichael BL, Hanny BW (1977) Endogenous levels of abscisic acid in water-stressed cotton leaves. Agron J 69:979–982
Mizrahi Y, Blumenfeld A, Richmond AE (1970) Abscisic acid and transpiration in leaves in relation to osmotic root stress. Plant Physiol 46:169–171
Noy-Meir I (1973) Desert ecosystems: Environment and producers. Ann Rev Ecol Syst 4:25–52
Orians GH (1975) Diversity, stability and maturity in natural ecosystems. In: van Dobben WH, Lowe-McConnell RH (eds) Unifying concepts in ecology. Dr W Junk, B.V. Publisher, The Hague, pp 139–150
Parton WJ, Lauenroth WK, Smith FM (1981) Water loss from a shortgrass steppe. Agric Meteor 24:97–109
Paulsen HA Jr, Ares FN (1962) Grazing values and management of black grama and tobosa grasslands and associated shrub ranges of the Southwest. USDA Techn Bull No. 1270, pp 56
Penman HL (1948) Natural evaporation from open water, bare soil and grass. Proc Roy Soc, Ser A 193:120–145
Reynolds HG, Martin SC (1968) Managing grass-shrub cattle ranges in the Southwest. USDA Agric Handbook No. 162, p 44
Sala OE, Lauenroth WK, Parton WJ, Trlica MJ (1981) Water status of soil and vegetation in a shortgrass steppe. Oecologia 48:327–331
Scholander PF, Hammel HT, Bradstreet ED, Hemmingsen EA (1965) Sap pressure in vascular plants. Science 148:339–346
Smith RE, Schreiber HA (1974) Point processes of seasonal thunderstorm rainfall. 2. Rainfall depth probabilities. Water Res Research 10:418–426
Spanner DC (1951) The Peltier effect and its use in the measurement of suction pressure. J Exp Bot 2:145–168
Szarek SR, Woodhouse RM (1976) Ecophysiological studies of Sonoran Desert plants. I. Diurnal photosynthesis patterns of Ambrosia deltoidea and Olneya tesota. Oecologia 26:225–234
Westman WE (1978) Measuring the inertia and resilience of ecosystems. Bioscience 28:705–710
Woodmansee RG, Vallis I, Mott JJ (1981) Grassland nitrogen. In: Clark FE, Rosswall T (eds), Terrestrial nitrogen cycles. Stockholm: Ecol Bull 33:443–462
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Sala, O.E., Lauenroth, W.K. Small rainfall events: An ecological role in semiarid regions. Oecologia 53, 301–304 (1982). https://doi.org/10.1007/BF00389004
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DOI: https://doi.org/10.1007/BF00389004