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针阔树叶,是各种树木吸收光能,在叶绿素及酶的作用下,利用二氧化碳和水合成有机物质,将光能转变成化学能的重要器官。并有蒸腾水分、调节树体水分及温度平衡的重要功能。在整个生长期间,树叶制造、转运和输送营养物质是连续不断的,因而各种树木的每片树叶内始终保持有一定数量的养分,即使进入秋季某些树叶开始形成离层脱落时,其内含营养物质也不会全部转移或消耗贻尽的,亦即仍有一定营养价值。所以许多乔灌木树叶、嫩枝和果实,都可作各种牲畜饲料。有的树叶鲜叶适合性好,牲畜就很喜欢吃;有的鲜叶适口性差,干叶牲畜倒很爱吃,仍不失饲用价值;针叶树采伐后可以收获大量新鲜针叶,例如每一立方米云杉材,可得五十公斤针叶,这些针叶在提取松针油后,其松针粉恰好用作饲料。
Acacia leaves, is a variety of trees absorb light energy, the role of chlorophyll and enzymes, the use of carbon dioxide and water into organic matter, the light energy into chemical energy of the important organs. And transpiration of water, adjust the water content and temperature balance of the important functions. During the whole growth period, leaves produce, transport and deliver nutrients continuously. Therefore, every leaf of each tree keeps a certain amount of nutrients. Even if some leaves fall into the ground during the autumn, Containing nutrients will not be fully transferred or consumed Yi Yi, which is still a certain nutritional value. So many trees and shrubs, leaves, twigs and fruits can be used for all kinds of livestock feed. Some leaves are suitable for fresh leaves, livestock like to eat; some fresh palatability is poor, dry-leaf livestock down to eat, still without losing the value of feeding; Coniferous harvest can harvest a large number of fresh conifers, for example, each Cubic spruce material, can get 50 kilograms of needles, these needles in pine needle oil extraction, pine needles just for feed.