Species selection in hardwoods research: variations in baseline physiological responses of select temperate hardwood tree species

编号 zgly0000818195

文献类型 期刊论文

文献题名 Species selection in hardwoods research: variations in baseline physiological responses of select temperate hardwood tree species

作者 Shaneka  S.  Lawson  Paula  M.  Pijut  Charles  H.  Michler 

作者单位 USDA  Forest  Service 

母体文献 林业研究: 英文版 

年卷期 2013(2)

页码 285-292

年份 2013 

分类号 S 

关键词 drought    water  stress    stomatal  density    hardwood  trees 

文摘内容 Drought periods are becoming more extreme worldwide and the ability of plants to contribute towards atmospheric flux is being compromised. Properly functioning stomata provide an exit for water that has been absorbed by the roots, funneled into various cell parts, and eventually released into the atmosphere via transpiration. By observing the effects that weather conditions such as climate change may have on stomatal density, distribution, and functioning, it may be possible to elucidate a portion of the mechanisms trees use to survive longer periods of water stress. This study analyzed stomatal density (SD), stomatal conductance (gs ), CO2 assimilation (A), instantaneous water-use efficiency (WUEi ), and transpiration (E) rates in six native tree species in the Midwestern USA and showed that trees within the same ecotype followed similar trends, but that trees within the same family did not when exposed to identical greenhouse conditions. Naturally drought tolerant tree species demonstrated lower g s and higher WUEi , while intolerant species had higher SD. This study showed negative or no correlation between SD and g s , A, E, and WUEi and positive correlations between E and A and gs and E.