geographical vicariad

langbianensis, in southwest China, substitute gradually from north to south, forming a geographical substitute group.

在我国西南部横断山地区至云南南部一线,高山松、云南松和思茅松构成有规律的地理替代。

Based on present research literatures,the importance of Artemisia species in the desert and steppe vegetation,their adaptations to shifting sand and drought,their geographical substitution and their roles in the desert control were reviewed.

以大量研究文献为基础,综述了中国蒿属植物在荒漠和草原植被中的地位、蒿属植物对逆境的适应、蒿属植物的地理替代性以及蒿属植物在治沙实践中的作用。