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杨树系速生树种,在“三北”干旱和半干旱的暖温带、温带地区,杨树的栽培已在整个林业经营活动中占重要地位。我们调查区是山西省北部半干旱的雁北地区境内的缓坡丘陵、大同盆地及桑干河流域两岸。调查地约有350亩杨树人工林。我们从杨树适生条件及分布范围内,选择其主导因子,如不同立地类型、土壤结构、栽植方法和不同密度进行根系的调查,来观察根系生长发育的性状。
Poplar fast-growing species, in the “Three Norths” arid and semi-arid warm temperate and temperate regions, poplar cultivation has played an important role in the entire forestry business activities. The area under investigation is the gentle slope hills in the semi-arid Yanbei area in the northern part of Shanxi Province, the Datong Basin and the Sanggan River valley. The survey site has about 350 acres of poplar plantation. We selected the dominant factors such as different site types, soil structure, planting methods and root densities at different densities to observe the root growth and development traits from the poplar habitat conditions and distribution.