摘要
在干热的自然环境条件下，加勒比松针叶含水量为５５％～５８％，自由水含量４％～７％，束缚水含量为５０％～５１％，束／自比值为８～１２，表明束缚水是主要的水分存在形式．在蒸腾作用日变化中，蒸腾主要受温度调节，蒸腾失去的水分主要是自由水，离体针叶的保水力强于云南松．在ＰＥＧ诱导水分胁迫条件下，加勒比松针叶叶绿素含量稳定，甚至有所提高．Ｐｒｏ随ＲＷＣ下降而上升，ＰＯＤ和ＳＯＤ活性也明显增大．加勒比松能在干旱环境中生存和生长。
Under dry-hot condition,water contents,free water contents,bound water contents,and the ratio of bound water contents/free water contents in the needles of Pinus caribaea were 55%～58%,4%～7%,50%～51%,and 8～12 respectively,indicating that bound water was major water status.Transpiration was regulated by temperature and the free water was the main water consumption of transpiration during the diurnal variations of transpiration rates.The water retention capacity of Pinus caribaea was stronger than that of P.yunnanensis.Under induced water stress by Polyethylene glycol,the chlorophyll contents were stable or increased a little.The amount of free proline accumulation increased greatly with the decrease of relative water contents,the perxoidase activity and superoxide dismatase activity were also obviously increased.These physiological characteristics were helpful for living and growing of Pinus caribaea under dry environment.
出处
《西南林学院学报》
1997年第4期9-15,共7页
Journal of Southwest Forestry College
基金
四川省重点科技攻关项目
关键词
加勒比松
水分胁迫
耐旱性
Pinua caribaea
Water stress
Drought resistance
