人工林的介绍
人工林指通过人工措施形成的森林。人工林的经营目的明确，树种选择、空间配置及其他造林技术措施都是按照人们的要求来安排的。其主要特点是：①所用种苗或其他繁殖材料是经过人为选择和培育的，遗传品质良好，适应性强；②树木个体一般是同龄的，在林地上分布均匀；③用较少数量的树木个体形成森林，群体结构均匀合理；④树木个体生长整齐，能及时地、划一地进入郁闭状态；郁闭成林后个体分化程度相对较小，林木生长竞争比较激烈；⑤林地从造林之初就处于人为控制下，能适应林木生长的需要1。我国人工林达6933万公顷，居世界第一位2。重要的人工林树种有桉树、泓森槐、马尾松、杉树等。
A man once had a dream about the Black Forest in Germany. In his dream he was walking in the forest
一个人有一个关于德国黑森林的梦。梦里他在森林里漫步的时候两个男人跑出来，试图把他扔在地上。他跑一样快，他可以，但他们跟着他。他达到他看见在他面前的两条路的地方，人的权利和其他左侧。应该走那条路？他听到身后有两个男人，越来越近，并在同一时间，他听到一个声音在他耳边。告诉他去的权利，和
他这样做了。他跑的很快就来到一家小酒店。他得到了热情的接待和一个房间，和他获救了。那是梦。
二十年后他真的在黑森林中，如在梦中发生的很久以前，两个男人跑出来，试图把他扔下来。他跑了起来，来到一栋有两条路.like的梦想。他记得这个梦带到正确的道路。他很快到达一家小酒店，了，所以他很安全。他二十年前的梦想救了他的命。 A man once had a dream about the Black Forest in Germany．In his dream he was walking in the forest when two men ran out and tried to throw him to the ground．He ran off as fast as he could，but they followed him．He reached a place where he saw two roads in front of him，one to the right and the other to the left．Which road should he take? He heard the two men behind him，getting nearer, and at the same time he heard a voice in his ear．It told him to go to the right，and
he did so．He ran on and soon came to a small hotel．He was received there kindly and given a room，and he was saved from the two men．That was the dream．
Twenty years later he was really in the Black Forest and，as happened in the dream long ago，two men ran out and tried to throw him down．He ran off, and came to a place with two roads．like in the dream．He remembered the dream and took the road to the right．He soon reached a small hotel，was taken in，and so he was safe．His dream of twenty years before had saved his life
