Abstract: In this paper,a field experiment with four years straw mulching was conducted in a young tea plantation in subtropical hilly red soil region to study the integrative ecological regulation effects of this mulching.The results showed that straw mulching improved soil physical and chemical properties, increased the moisture content in 0～20 cm soil layer during the key growth period of tea plant (April to June),postponed and shortened the period of high temperature and continual drought,inhibited some pest insects,diseases and weeds,and had duplex effects in raising and keeping temperature during cold time and lowering temperature during hot season.Moreover,it was helpful to the growth of earthworms.

Key words: Wheat, CO₂ concentration, Osmotic stress, Active oxygen, Membrane injury