A REVIEW OF PROGRESS IN STUDIES OF PLANT ECOPHYSIOLOGY: CONTROLLED EXPERIMENTS AND INSTRUMENTATION Present Research Situation and Development Trend of Wood Acoustical Properties Using for Chinese Folk Musical Instruments Study on the instrumental error of the portable photosynthesis system The design and application of an observation instrument of microclimate within crop canopy Application and progress of split-compartment facility in studies of arbuscular mycorrhizal fungi Technique of Plastic Micro Catchment and PromoteInfiltration for Economic Forest on Loess Plateau An Instrument for Auto Measuring the Width and Length of Wood Board Acoustic Vibration Property of Full-Size Spruce Wood Soundboard of Musical Instruments Clinical evaluation of multi-function “rapid” allergic skin test instrument for application in drug allergy testing