论文部分内容阅读
要提高泡桐的造林技术,必须首先了解该树种的生理、生态特性。下面以海岛泡桐的研究结果(林,1977年)为重点加以叙述。一、生长特性1.年生长过程:种根定植一年,其树高生长为2.32米,根径生长为6.15厘米,而平茬后一年的生长,分别为4.21米和9.44厘米。二者的生长过程大体一致。年生长过程可分为生长期(3月下旬～8月下旬),生长结束期(8月下旬～10月下旬)及生长休止期(11月上旬～翌年2月中旬)。4月上旬～11月下旬的月平均气温相差不超过5℃,无多大变化。因此,泡桐的生长旺季约为5个月时间。2.林分产量构造:据调查,在台湾中部峦大林区(海拔950米)种植的海岛泡桐和
Paulownia to improve afforestation technology, we must first understand the physiological and ecological characteristics of the tree species. Below the island Paulownia study (Lin, 1977) as the focus to be described. First, the growth characteristics 1. Annual growth process: Year planting seedlings, the tree height growth of 2.32 meters, root diameter growth of 6.15 cm, while the stubble growth after one year, respectively 4.21 m and 9.44 cm. The growth of the two generally in line. The annual growth process can be divided into growing season (late March to late August), end of growth (late August to late October) and rest period of growth (early November to mid February). The average monthly temperature difference between early April and late November is no more than 5 ℃, with little change. Therefore, Paulownia growing season is about 5 months time. 2. Stand yield structure: According to the survey, the island in Taiwan’s central Dalu Dalu (950 meters above sea level) planted island Paulownia and