Abstract: Qinghai is a multi-ethnic-populated areas with the typical plateau continental climate such as drying, less rain, windiness, cold, long sunshine hours and so on.

青海是一个多民族聚居，属于典型高原大陆性气候，具有干燥、少、多风、冷、日照时数长等特征。

Abstract : In dry area or sandy dryland, for the reason of scarce rainfall, windiness and lack of labor power and material resources, the low survivor ratio of afforestation were common.

摘要 ： 在干旱或荒漠造，稀少，风多且风大，加之人力、物力贫乏等原因，导致造成活率低。