Study On Eco-physiological Effects Of Straw Mulching And Intercropping White Clover In Tea Plantation In Subtropical Hilly Red Soil Regions

The resources of rainfall and heat are rich in subtropical hilly red soil regions, where there are abundant species. However, runoff of water and soil, seasonal drought, poor soil and rampant weed, pests and diseases severely restrict the sustainable development of agriculture in this region. Tea (Camellia sinensis) is an evergreen broad bush and fond of light, humidity, shady and fear of coldness. Its growth and development depend greatly on the situated environment and management measures. And poor management would lead to ecology unbalance in tea plantation. Therefore, probing into the effects of different biological managements on tea eco-physiology and growth will be of important theoretical and practical value in production with high quality, safety and high efficiency.The research was set in Dongxishan Tea Plantation of Xiangfeng Tea Factory, Hunan, Changsha, which is a typical subtropical hilly red soil region. Compared to clean tea plantation as CK, consecutive 5 years' large-field contrast experiments of intercropping white clover and mulching straw were conducted in tea plantation. This thesis has discussed the impacts of the two biological measures on tea eco-physiology, growth, tea quality and yield in tea plantation. The main results were as follows.Intercropping white clover and mulching straw improved physical properties, such as debating bulk density of soil. Moreover, they increased the content of organic matter and provision of nutrient. White clover obviously increased the content of N with nitrogen fixation and at the same time consumed some available P.Soil water content in tea plantation behaved in spatial and temporal dynamic change. The change in a year could be divided into three stages (i.e. saturated stabilization, sharp dropping and ascending period) and accorded with the law of needing water of tea greatly. The soil...