A STUDY ON THE COMPOUND FERTILIZER FOR PHYLLOSTACHYS HETEROCYCLA CV. PUBESCENS APPLIED NUTRIENT SOLUTION EFFECT ON ULTRASTRUCTURE OF STOMA OF LEAVES OF PHYLLOSTACHYS HETEROCYCLA CV.PUBESCENS AFTER STUDY ON PRODUCTIVITY AND SOIL PROPERTIES OF MIXED FORESTS OF CHINESE FIR AND PHYLLOSTACHYS HETEROCYCLA CV.PUBESCENS Comparison of the population structures between the natural forest and the high-yield forest of Phyllostachys heterocycla cv.pubescens in Wuyi Mountain