McKevlin M R, Hook D D, McKee W H
Southeastern Forest Experiment Station, 2730 Savannah Hwy., Charleston, SC 29414, USA.
Tree Physiol. 1995 Nov;15(11):753-8.
Growth characteristics and nutrient utilization rate of Nyssa aquatica L. seedlings grown in pots containing flooded or well-drained soil were compared in a greenhouse study. For most of the growing season, relative height and diameter growth rates, and biomass accumulation rates were greater for seedlings in flooded soil than for seedlings in well-drained soil. The concentration of Fe in the roots of seedlings in flooded soil was almost tenfold greater than that of seedlings in well-drained soil. However, flooding had no effect on foliar Fe concentrations. The flooding treatment resulted in decreased concentrations of N in all component parts and increased concentrations of P in the roots and stem, but it had no effect on foliar P concentrations. In response to flooding, foliar K concentrations decreased, whereas the concentration of K in the roots increased. Flooding had no effect on the K concentration of the stem. Seedlings in flooded soil produced more total biomass per milligram of nutrient absorbed than seedlings in well-drained soil, suggesting that N. aquatica seedlings are more efficient at producing biomass and height growth under hydric conditions than under mesic conditions.
在温室研究中，比较了生长在装有淹水或排水良好土壤的花盆中的沼生栎幼苗的生长特性和养分利用率。在生长季节的大部分时间里，淹水土壤中幼苗的相对高度、直径生长速率和生物量积累速率均高于排水良好土壤中的幼苗。淹水土壤中幼苗根系的铁浓度几乎是排水良好土壤中幼苗的十倍。然而，淹水对叶片铁浓度没有影响。淹水处理导致所有组成部分的氮浓度降低，根系和茎中的磷浓度增加，但对叶片磷浓度没有影响。作为对淹水的响应，叶片钾浓度降低，而根系钾浓度增加。淹水对茎中的钾浓度没有影响。淹水土壤中的幼苗每吸收一毫克养分所产生的总生物量比排水良好土壤中的幼苗更多，这表明沼生栎幼苗在湿润条件下比在中生条件下更有效地产生生物量和进行高度生长。
