02168naa a2200205 a 450000100080000000500110000800800410001910000160006024501420007626000090021850000140022752015380024165000110177965300230179065300210181365300230183470000190185770000200187677300660189610746711995-03-13       1986    bl ---       0--  u    #d1 aIDSO, S. B.  aFoliage temperaturebeffects of environmental factors with implications for plant water stress assessment and the CO2/climate connection.  c1986  aSeparata.  aThroughout the summer and fall of 1985, several day-long sets of foliage temperature measurements were obtained for healthy and potentially transpiring water hyacinth, cotton, and alfalfa plants growing in a sealed and unventilated greenhouse at Phoenix, Arizona, along with concurrent measurements of air temperature, vapor pressure and net radiation, plus, in the case of the water hyacinths, leaf diffusion resistancemeasurements. Some data for these plants were additionally obtained out of doors under natural conditions, while dead, nontranspiring standsof alfalfa and water hyacinth were also monitored, both out of doors and within the greenhouse. Analyses of the data revealed that plant nonwater-stressed baselines, i.e., plots of foliage-air temperaturedifferential versus air vapor pressure deficit for potentially transpiring vegetation, were (1) curvilinear, as opposed to the straigth lines which have so often appeared to be the case with much smaller and restricted data sets, and (2) that these baselines are accurately described by basic theory, utilizing independently measured values of plant foliage and aerodynamic resistances to water vapor transport. These findings lead to some slight adjustments in the procedure for calculating the Isdo-Jackson plant water stress index and they suggest that plants can adequately respond to much greated atmospheric demands for evaporation than what has been believed possible in the atmospheric carbondioxide concentration will have little direct effect on vegetation...  aPlanta  aAssimilacao de CO2  aEstresse hidrico  aTemperatura foliar1 aCLAWSON, K. L.1 aANDERSON, M. G.  tWater Resources Researchgv.22, n.12, p.1702-1716, nov. 1986.