A PRELIMINARY STUDY ON THE PLATYCLADUS ORIENTALIS OPEN FOREST IN THE LOESS PLATEAU OF NORTHERN SHAANXI PROVINCE

The Platycladus orientalis open forest is the important one of the community-type in forest steppe zone of the loess plateau in northern Shaanxi Province, it survives only in Shenmu and Fugu county of northeast part, four types are often met: (1) Artemisia giraidii-Platycladus orientalis open forest; (2) Pennisetum flaccidum-Platycladus orientalis open forest; (3) Artemisia giradii+Stipa bungeuna-Platycladus orientalis open forest; (4) Bupleurum scorzoneri folium+Stipa bungeana-Platycladus orientalis open forest. According to analysis of the arborous regeneration, if climate doesn't happen great changes from now onwards, the Platycladus orientalis open forest is still stable phytocoenosium in forest steppe zone.