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我们在民权沙区的防护林带和片林中,看到许多生长缓慢,生长势极弱的小树,人们把这种未老先衰的小树,统统叫做“小老树”。“小老树”是怎样形成的?如何进行改造和防止,就成为这个地区林业生产中的重要同题。鉴于这种情况,我们结合毕业生产实习进行了调查研究。一、“小老树”的成因据调查,“小老树”形成的原因很多,概括起来有以下三方面:
In the shelter belts and patches of forests in the Sand Areas of Civil Rights, we have seen many small trees that grow slowly and have a very weak growth potential. We call this tree, which is not yet premature, the “little old tree.” How the “little old tree” was formed? How to carry out the transformation and prevention has become an important topic in the forestry production in this area. In view of this situation, we conducted a research study combining graduate production internships. First, the “small old tree” causes According to the survey, “small old tree” formed for many reasons, summed up in the following three aspects: