陇东黄土高原沟壑区各立地类型水保适生树种的确认

在黄委会西峰水保站关于陇东黄土高原沟壑区立地条件类型划分和拟定的适生树种基础上,针对这里干旱少雨的突出特点,本着乡土树种为主、引进树种为辅的原则,采取自采、自育、自造和以抗旱为中心的造林技术,在西峰水保站南小河沟试验场应用大断面法布设“地树对位”试验区,以相对成活率、相对保存率和相对生长率计算得到的适生值为主要依据,对陇东黄土高原沟壑区8种立地条件类型的适生树种分别进行了确认,共确认乔灌木树种16种。

Determination of Tree Species of Conservation Forest Suitable to Be Used in Different Type of Land in the Gullied Loess Plateau of East Gansu Province

Based on the classification of insitu types and the proposed suitable tree species in the gullied Loess Plateau of east Gansu Province, a experimental spot set up by means of large sections was layed out in the Nanxiaohegou Experimental area of Xifeng Experimental Station of Soil and Water Conservation. In the light of characteristics of aridity and short of rainfall and adhering to the guideline of selection of local tree species as first choice and introduced tree species as the second, the afforestation techniques of self-collecting, self-breeding, self-afforestation were adopted focusing on the resistance against drought. According to suitable growth values which were counted from relative survival rate, relative preserving rate and relative growth rate, 16 species arbors and shrubs suitable to be used in 8 insitu types in gullied Loess Plateau in east Gansu Province were finally selected and confirmed.