关键词: 丘陵, 水热状况, 华北落叶松, 人工林生长特性

Abstract: Investigation showed that the height growth of artificial larix principis-rupprechti forest on gentle hills in Bashang region was higher on shady slope than on sunny slope as the forest was under 15years old:for the 15-20-year-old forest their height growth was in the order:mid-shady slope ＞ lower sunny slope ＞ lower shady slope but their diameter and timber-growing amount were higher on sunny slope than on shady slope.The young trees of larix principis-rupprechti grow faster on shady slopes than on sunny slopes due favourable water condition;However,the established forest on sunny slopes of hills have a higher preductivity due to favourable heat condition.The artificial forest on middle shady slopos could be naturally regenerated at 28 years old but for other sites they shouldn't be regenerated before 30 years old.

Key words: Hill, Weter and heat condition, Larix principis-rupprechti, Artificial forest