摘要
树木叶片的耐旱力因树种不同而异,也因树体的生长时期、在树冠上的部位和环境条件的不同,不断地变化。在自然生境和生长状况下,耐旱力的可靠指标怎样才能取得,目前尚未见到快速有效的测定方法。我们试图根据在模拟干旱(低水势的甘露醇溶液)条件下,叶片光合放氧受抑制程度的判定、耐旱潜力的比较及其变化规律,常绿树种在越冬过程中耐寒力与渗透调节能力的变化密切相关性,来弄清叶片耐寒力与耐旱力的变化是否也是同步的。
According to the inhibition extent of oxygon released from leaves which are in artificial solution wite a series of low water potentials, the paper proposed a method for measuring the relative drought hardiness of plants. It has been found out that there is a common law for the changes in drought hardiness of evergreen trees in process of hibernation, which is a tendency with 'M', i. e. drought hardiness using at the stage of acclimation to cold in the primary period of hibernation, falling drown at severe cold stage, rising again at the stage of air temperature going up, and falling down again at the beginning of spring. With the method incroduced in this paper, the changes in drought hardiness of various tree species or one tree in the process of growth can be compared vertically and horizontally, which provides the bases for the study on environmental physiology and the disposition of various tree species in planlation. Some corresponding water running principles are proposed from the law summarized in this paper.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1991年第5期541-544,共4页
Scientia Silvae Sinicae
关键词
常绿树木
光合放氧
耐旱力
Evergreen tree
Oxygen released from photosynthesis
Drought hardiness
