摘要
为进一步探讨PV(Pressure-Volume)技术在树木抗旱性研究中的应用前景,比较成、幼龄树木的抗旱性差别,在对樟子松等7种成龄树木抗旱性生理指标研究的基础上,对其幼树的抗旱性进行了研究。结果表明,对成、幼龄树木一年生小枝用PV曲线所测得的诸水分状况参数随年生长发育进程的的变化规律是一致的;用嫩枝生长初期和枝条完全木质化时期两个阶段的水分参数比较树木的抗旱性、具有较大的可靠性和实用性;幼树在嫩枝生长初期的抗旱性较成树弱,当新枝完全木质化之后,二者的抗旱性基本相近。
In order to inquire into potential application of PV (Pressure-Volume) technique to research the dry resistance of tree and compare the differences between young and adult trees in this respect, the dry resistances of young trees of seven species including pinus sylyestris var. mongolica were investigated based on physioligical parameters of dry resistances of their adult trees. The parameters of water conditions in one-year branches of both young and adult trees were measured with PV-curves. They changed with the annual growing processes of the branches. It is relatively reliable and practical that the water parameter of either early stage of young branch growth or the full lignification stage of the branch are considered as the indicators of their dry resistances.The young trees have the less dry resistance than the adult ones during the early stage of young branch growth. There are almost no differences between young and adult trees after the full lignification of the branches.
出处
《应用生态学报》
CAS
CSCD
1990年第2期114-119,共6页
Chinese Journal of Applied Ecology
关键词
PV技术
树木生态学
抗旱性
PV-Technology, Water potential of plant, Osmotic potential, Relative water content, Dry resistance.