摘要
加勒比松包括本种加勒比松，巴哈马加勒比松和洪都拉斯加勒比松３个变种。速生耐旱，积累物质的能力很强，１年生幼苗株高为云南松或思茅松的４～５倍，鲜重为１２～１５倍，干重为１５～２０倍。同化物集中在地上部分。针叶含水量与云南松或思茅松相似，约为６５％～７０％，但加勒比松的束缚水含量／自由水含量比值为９～１１，而云南松或思茅松只有５～６。蒸腾强度较小，只及云南松或思茅松的５０％左右。在ＰＥ６诱导水分胁迫下，针叶相对含水量下降较小，质膜透性较低，保水力强。叶绿素含量不因ＰＥＧ诱导水分胁迫而下降。上述表明，加勒比松对干旱环境有明显的适旱性生理特征，比云南松或思茅松更能在干旱环境中生存和生长。
Caribbean pines, which include Pinus caribaea Morelet var．carlbaea Mo- relet，Pinus caribaea Morelet var．bahamensis and Pinus caribaea Morelet var．hon- durensis，are fast－growing and drought－resistant tree species and have strongability toaccumulate materials．For one year old Caribbean pine seedlings，their heights were 4～5times，fresh weight were l2～15 times and dry weight were 15～20 times of that of Pinusyunnanensis Or Pinus kesiya var．langbianensis；and their assimilates were mainly allo-cated to the aerial part of the plant．The needle water contents of Caribbean pines wereabout 6 5 ％～70 ％, which were similar to that of Pinus vunnanensis or Pinus kesiyavar．langbianensis. However，bound water contents／Free water contents ratio were 9～11，while that of Pinus yunnanensis or Pinus kesiya var．langbianensis were only 5～7．The transpiration rates of Caribbean pines were only 50 ％ of that or Pinusyunnanensis or Pinus kesiya var．langbianensis. Under induced water stress bypolyethylene glycol（PEG），it was found that Caribbean pines had low decrements of rel-ative water contents，low plasma membrane permeability and strong water retaining ca-pacity；and their chlorophyll contents did not decrease with different concentrations ofPEG. The physiological measurements indicated that Caribbean pines had obviouslydrought resistance characteristics．For its strong adaptability to drought environment，Caribbean pines should have better growth performance and higher survival ratethan Pinus yunnanensis or Pinus kesiya var．langbianensis under drought condition.
出处
《西南林学院学报》
1996年第3期129-134,共6页
Journal of Southwest Forestry College
基金
四川省重大科技攻关项目
关键词
加勒比松
抗旱
适应性
Caribbean pine
Drought resistance
Adaptability
