论文部分内容阅读
新疆杨长的高大标直,使人喜爱,但她这个多病多愁的树美人,长到四年以后得个不治之症,破腹病。也有人管她叫破肚病,破皮病,再往大长也不成材,如察布查尔平原林场五九年建场栽植新疆杨,患了该病,只好大部砍伐另选其它树种,这病究竟怎么发生的?如何防治?经过我几年的观察实验,其原因有如下几个方面:一、日照、冻害防治。二、土层浅,水位高。其主要原因是百分之九十以上是日照冻害所致,因病患在一个方向,一个部位。面向西南部位,高低一个部位一个方向。它在四年树龄前本不发生此病,四年树龄以前树的直径很小,阳光直照在一根很细的树杆上,发挥不到热的作用,但到四年生之后,树直径达十公
Yang tall and straight in Xinjiang, cute, but she is a sickly tree beauty, grow to be incurable after four years, breaking belly disease. Some people call her called broken stomach, broken skin disease, and then to the long is not a timber, such as the Chabuchar plain farms built in Xinjiang ninety-nine years, suffering from the disease, had to cut most of the other trees How to prevent and cure? After several years of observation and experiment, the reasons for the following aspects: First, sunshine, frost damage prevention and treatment. Second, shallow soil, water level. The main reason is that more than 90% of sunshine frost damage caused by the patient in one direction, a site. For the southwestern parts, a part of a high and low direction. It does not occur in four years of age before the age of four years ago the tree diameter is very small, the sun shining on a very thin tree pole, the role of less than heat, but after four years of age, the tree diameter Up to ten public