黄土区植被的演替

Vegetation Succession in Loess Area

黄土区地处我国中部，四周高山环绕，区内多为１０００ｍ以下的黄土丘陵，具有明显的地理特征。气候为海洋性暖温带湿润季风气候向温带大陆性干旱气候过渡；植被为落叶阔叶林向森林草原、草原、荒漠草原植被型的过渡区。这些特点对我国中西部地区的农林牧业发展和布局将产生巨大而又复杂的影响。因此，研究该区森林、灌丛、草原植被的演替规律。

The Loess area located in the middle part of China is characterized by its obvious geographical features that is surrounded by high mountains and inlaid densely with Loess hill mostly below l 000 m.And its climate transites from marine warm temperate damp monsoon zone to contential temperate arid zone; Vegetation transites from deciduous broadleaf trees to forest steppe,steppe and desert steppe.All these features have a tremendous and complex influence on the advancement and distributional arrangement of agriculture forest and husbandry in the middle west area.So study on forest, shrubs and steppe vegetation succession will guide the development of agriculture,forest and husbandry in this area.