STUDIED ON AULONORAPHIDINALES FROM WUDALIAN-CHI LAKE Studied on Aulonoraphidinales From WuDaLian-chi Lake Characteristics or zero point of charge of volcanic ash soils in Changbaishan and Wudalianchi Allelopathy of Aqueous Extracts from Four Species Plants on Artemisia wudanica Floristic Analysis on Spermatophyte Genera in Wudalianchi Parasphenopteris Sun & Deng, a new genus from the Lower Permian of Wuda, Nei Mongol, China The effect of bryophytes on nutrient accumulation in surface soil in the Wudalianchi volcanic area Discovery and Significance of the Genus Caulopteris from the Wuda Area of Inner Mongolia STUDY ON THE RELATIONSHIPS OF POPULATION DYNAMICS OF PHYTOPLAMKTON AND ENVIRONMENTAL FACTORS OF WUDALIAN LAKE Comparison of Flowering Phenology of Two Kinds of Sandy Semi-shrub of Artemisia L. in the Horqin Sandy Land