Ren Z, Sucoff E I
Department of Forest Resources, University of Minnesota, 1530 North Cleveland Avenue, St. Paul, MN 55108, USA.
Tree Physiol. 1990 Sep;6(3):337-46. doi: 10.1093/treephys/6.3.337.
Soil solution Al may contribute to red spruce (Picea rubens Sarg.) decline by inhibiting transpiration (Klein 1985). This study examines how Al affects transpiration in red spruce and honeylocust (Gleditsia triacanthos L.) seedlings and explores mechanisms for the observed responses. Red spruce seedlings were grown in dilute nutrient solutions containing 0 to 925 microM Al at pH 4.5 or 3.8. Solution Al had no effect on the transpiration, root hydraulic conductivity (K(r)) or shoot water potential (Psi) of red spruce. Transpiration of honeylocust was higher in the presence of 100 to 350 microM Al than 0, 500, or 600 microM Al. The Al-induced increases in transpiration of honeylocust were unrelated to shoot Psi or root K(r), but were closely correlated with the greater root lengths produced by intermediate levels of Al. In neither species was transpiration correlated with tissue concentrations of Al, P, K, Ca or Mg.
土壤溶液中的铝可能通过抑制蒸腾作用导致红云杉（Picea rubens Sarg.）数量减少（Klein，1985年）。本研究考察了铝如何影响红云杉和刺槐（Gleditsia triacanthos L.）幼苗的蒸腾作用，并探究了观察到的响应机制。红云杉幼苗种植在pH值为4.5或3.8、含有0至925微摩尔铝的稀营养液中。溶液中的铝对红云杉的蒸腾作用、根水力传导率（K(r)）或嫩枝水势（Psi）没有影响。在含有100至350微摩尔铝的情况下，刺槐的蒸腾作用高于铝含量为0、500或600微摩尔时的情况。铝诱导的刺槐蒸腾作用增加与嫩枝Psi或根K(r)无关，但与中等水平铝产生的更长根长密切相关。在这两个物种中，蒸腾作用均与铝、磷、钾、钙或镁的组织浓度无关。
