林朵林场西南桦造林试验

为了科学地发展西南桦（Betula alnoides）人工林,于1999年至2010年在广西天峨县林朵林场开展西南桦造林试验,研究西南桦的生长适应性、丰产性、林分分化、径级变化、树干通直度以及对病虫害和低温雨雪灾害的抵抗能力。采用线路踏查法和标准林地法选定样株,测定西南桦的树高、胸径、材积,并调查其对病虫害和低温的抗逆能力。试验结果为：11年生林分平均树高19.7m,平均胸径17.2cm,平均蓄积171.7 m3/hm2,超过阔叶树速生丰产林指标,西南桦幼林能够抵抗-2℃低温天气7d。西南桦在广西天峨县林朵林场有较大的发展潜力。

Afforestation Test of Betula alnoides in Linduo Forest Farm

In order to develop the plantation of Betula alnoides scientifically,the afforestation technics of Betula alnoides were studied on Linduo Forest Farm in Guangxi from 1999 to 2010.The characteristics of Betula alnoides were analyzed,including growth adaptability,high yield,stand differentiation,changes in the diameter class,stem straightness,resistance to pests and diseases,and resistance to the disasters from rain,snow and so on.Sample trees were selected by means of reconnaissance survey and reference land unit method.The results showed that 11 years old trees were 19.7 m at height,17.2 cm at diameter and 171.7 m3/hm2 in volume,which indicated high yield and exceeded broad-leaved fast growing forest indicators.The plantation of Betula alnoides could resist to some pests and-2℃ lower temperature for 7 days.The study revealed that Betula alnoides plantation could be developed in large scale in Linduo Forest Farm.