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主伐和抚育采伐后伐区上经常留下带有针、阔叶的树枝。这些树枝往往被认为是废材而抛弃掉。其实针、阔叶中含有许多生物活性物质,这种物质可以在国民经济中被有效的利用起来。根据技术科学副博士Ф·Т·索浴德基的材料,松树和云杉的针叶含有25——40%毫克对畜牧业最重要的维生素——胡萝卜素,而白桦树叶的胡萝卜素含量达50%毫克以上。此外,针阔叶中还含有另外一些维生素如 C、E、B、P、K,和钴、锰微量
Cutting and tending After harvesting, cutting branches with needles and broad leaves often leave. These branches are often discarded as waste. In fact, broad-leaved leaves contain many bioactive substances that can be effectively utilized in the national economy. According to Ph.D., Ph.D. technologist, the coniferous pine and spruce needles contain 25-40% of the carotene, the most important vitamin in livestock husbandry, and the birch leaves have a carotenoid content of up to 50% milligrams or more. In addition, coniferous and broad leaves also contain other vitamins such as C, E, B, P, K, and cobalt, manganese trace