Characteristics Of Young Tea Garden Environment,Photosynthetic Physiology Of Tea Plant And Tea Quality Under The Mode Of Tea-medicinal Plant Intercropping

The advantaged medicinal resources in southern Shaanxi are used to intercropping with young tea trees in order to realize the early completion and put into production of the garden,improve the land utilization rate,and increase the income of tea farmers.This is done in order to make full use of the space environment of young tea gardens and solve problems such as no or little output of young tea gardens.Four different forms of tea tree monoculture-rhizoma corydalis-tea tree intercropping,astragalus smicus-tea tree intercropping,isatis tinctoria-tea tree intercropping,and monoculture tea plant-as well as tea tree intercropping with other plants-were examined in this study.A theoretical foundation for intercropping of medicinal plants in young tea plantations in southern Shaanxi was established by measuring the effects of intercropping on the microclimate and soil environment of the tea plantation,photosynthetic physiological indexes of the tea tree,and nutritional composition of tea.The following are the key findings of the study:（1）Intercropping,which rises with increasing soil depth,can raise soil moisture content and lower soil bulk density in tea gardens.To varied degrees,the root soil around the intercropping of medicinal plants in tea gardens raised the soil p H value and nutrient content,while the soil nutrient content dropped as the soil depth climbed.In the 0-20 cm and rhizosphere soil,the amount of accessible P was not readily apparent.With the exception of selenium elements,which gradually grew in the 20-40 cm soil layer but gradually dropped in the 0-20 cm and rhizosphere soil,the content of mineral elements in the rhizosphere soil tended to increase as soil depth increased.The intercropping of Rhizoma corydalis-tea tree and the intercropping of astragalus smicus-tea tree were superior in terms of the physiological demand features of tea tree for mineral elements.The intercropping between Isatis indigotica and tea tree,on the other hand,had the highest concentration of the majority of mineral elements.Rhizosphere soil contains less of the majority of mineral components than tea monoculture soil does.Also,at various growth stages,intercropped tea trees had higher mineral content than monoculture tea plantations.With the exception of soil sucrase during the germination stage and catalase during the entire period,soil enzyme activity gradually reduced as soil depth increased.At various phases of crop development,the enzyme activities of rhizosphere soil and non-rhizosphere soil were also different,as were the enzyme activities of intercropping tea plantations and monoculture tea plantations.While intercropping tea plantations with Isatis indigotica and tea trees had higher enzyme activities than monoculture tea plantations,among them,enzyme activity of Isatis indigotica-tea tree intercropping was higher.A correlation analysis revealed that the environment of a tea garden was influenced by the interactions between soil nutrients,mineral elements,and soil enzyme activity.（2）It goes without saying that interplanting medicinal plants in tea gardens can enhance the microclimate there.The intercropping between Isatis indigotica and tea tree was the best,which reducing the air temperature of the tea garden and increasing the air humidity of the tea garden.（3）The highest chlorophyll content,net photosynthetic rate,transpiration rate,stomatal conductance and leaf water use efficiency were found in the intercropping between rhizoma corydalis and tea trees,which were higher than those in monoculture plantations,but the intercellular CO₂concentration was lower than that in monoculture plantations.The correlation analysis of tea garden microclimate,tea plant chloroplast content,photosynthetic physiological indexes and leaf water use efficiency further showed that the shading effect on tea plant after intercropping resulted in the first change of temperature and humidity,and then the change of the whole photosynthetic system.（4）In order to accelerate the growth of new shoots and turn it into a garden as soon as possible,intercropping of medicinal plants can effectively promote tea bud weight and germination density.This creates a strong foundation for creating a tea garden with a high yield and high quality.Tea’s water extract,amino acid,and polyphenol levels were all higher under intercropping circumstances than they were under monoculture,although the amount of caffeine was lower.Intercropping may also help some mineral elements absorb and accumulate more readily.The concentrations of Ca,Mg,Mn,Al,and K in tea were all higher than those in mono-cropping tea,with the exception of Isatis indigoatis intercropping.To sum up,intercropping can affect the microclimate and soil environment of the tea garden,and since the change of the environment can produce effects and accumulation of mineral elements and nutrients in tea to meet the healthy development of human beings,intercropping is a green planting method that can increase farmers’ income.