通过对不同群体结构茶园十年的试验研究,结果表明,在亩植0.4—1.2万株的范围内,建园初一、二年,随着茶树密度的增加,茶树的生物总产量和经济利用系数提高,有利于提早投产,提前收益。从种植后的第三年开始,群体和个体的矛盾日益显露,茶树表现出明显的边际生长优势;输导根增加,吸收根减少;叶片光合效率降低;个体生物产量差异显著;茶园表层土壤容重加大,孔隙度降低,透水性减弱;中下层土壤含水量减少,旱季容易出现水分亏缺,因而使各处理间的经济利用系数日益接近,密植的增产效应逐年消失。从种植后的第八、九年开始,产量持平,甚至出现下降趋势。亩植1.6万株的产量反较1.2万株的低,表明密植增产的效果是有局限性的。新梢正常芽叶比重,鲜叶有效化学成分含量,以及儿茶素品质指数等,皆随种植密度的增加而降低。 Through ten years of experimental research on different groups of tea plantations, the results showed that in the first year and two years after the establishment of the park, the total biomass of the tea plant and its economic utilization Coefficient increases, is conducive to early production, early return. From the third year after planting, the contradiction between groups and individuals became more and more obvious, and the tea plants showed obvious advantages of marginal growth. The root of transpiration was increased, the absorption roots were reduced, the photosynthetic efficiency of leaves was decreased, the biomass of individual was significantly different, The porosity and water permeability will be weakened. The water content in the middle and lower layers will decrease, and the water deficit will occur in the dry season. Therefore, the economic utilization coefficient of each treatment is approaching and the yield-increasing effect of close planting disappears year by year. Starting from the eighth and ninth years after planting, output has been flat and even declining. The output of 16,000 mu of cultivars was lower than that of 12,000, indicating that the effect of close planting and yield increase was limited. Shoot shoots normal shoot weight, fresh leaves effective chemical composition, and catechins quality index, all with the planting density increased.