大气无时不在运动,时刻由高气压区流向低气压区,大气的这种物理运动称为风。风是一个很重要的生态因子,它对树木生长发育有很大的影响。在干旱风的影响下,树木因水分平衡不良,光合作用达不到应有的强度,成熟细胞达不到正常大小,所有器官都会矮化,整个树干亦呈矮态。在接近海岸、山背、高山树木线及大草原相邻的森林边缘,这种矮态现象是常见的。经常刮单一风向的地方,如果是微风,对树木的影响是轻微的,但在刮四级以上风时,树木迎风面的新生枝条常会受干旱风伤害。在强风作用下,甚至会使迎风面的枝芽枯死;在背风面枝叶继续发育,树枝长得粗壮长大,整株树木就会形成偏冠、旗形或是向地面弯曲。当树木受风的作 The atmosphere is always moving, from high pressure area to low pressure area, the atmosphere of this physical movement is called the wind. Wind is a very important ecological factor, it has a great impact on the growth and development of trees. Under the influence of arid wind, trees are not balanced due to poor water balance, photosynthesis does not reach the proper intensity, and mature cells do not reach the normal size. All organs are dwarfed and the entire trunk is also in a short state. This short state phenomenon is common on the edge of the forest adjacent to the coast, the mountain back, the alpine tree line and the prairie. Often the single direction of the wind, if it is a breeze, the impact on the trees is minor, but in the scraping of more than four winds, trees fresh air branches often wind damage by wind damage. Under the action of strong winds, the branches and buds on the windward surface will even wither and die. Branches and leaves continue to develop on the leeward side. The branches grow thick and big, and the whole tree will form a crown, flag or bend to the ground. When the trees are made by the wind