Six pyrite samples from the giant Bayan Obo REE-Nb-Fe deposit are dated by Re-Os technique. Pyrite studied is associated......

在实验室条件下,观测了科尔沁沙地乌兰敖都地区禾本科植物当年新采种子的萌发特点.15种植物中,披碱草、糙隐子草、冠芒草、大油芒......

This paper reviewed the concept,formation and function of gap and developed a new concept,canopy rift.It refers to the s......