Studies On Physio-ecological Traits Of Clonal Tea Seedlings

Tea (Camellia sinensis (L.) O. Kuntze) is main economic forest of subtropic forest ecosystem in China. Only in Zhejiang province there is 2.51×10⁵ hm², and the area is spreading. This paper studies on physio-ecological of tea. Although the effect of ecological factors on the photosynthetic and growth characteristics have been studied, the effect of water, temperature, photoperiod and CO₂ to the seedling of tea studied little. This paper is major on the effects of importance ecological factors to tea seedling, especially photosynthesis and growth. The importance conclusions are:The new biomass of tea seedling is more while water is suitable (60%-80%). LMR is significant higher at 80% water treatment, significant lower at 50% water treatment. RMR is significant higher at 50% water treatment, significant higher at 80% water treatment. Pn is lower while water treatment is higher. Because we keep 100% water treatment we are measure. 70% water treatment is the second highest. So, keep suitable water is propitious to tea seedling.The new biomass of tea seedling has significant difference on the different temperature. The new biomass is significant higher at 10℃ than 0 ℃. At 10 ℃, extend light duration result biomass increase of tea seedling, at 0'C there are no significant difference among light duration. Especially, higher temperature and longer light duration is benefit to root growth of tea seedling. At 0℃,the photosynthesis of tea seedling is lower, and longer light duration has not significant difference to photosynthesis. At 10℃, longer light duration increase photosynthesis. Longer light duration result tea seedling achieves LSP at lower light intensity.Elevated CO₂ significant enhances the biomass of tea seedling, especially for the root biomass and R/S. Elevated CO₂ significant enhances the photosynthesis of tea seedling, Shift atmosphere(A) to elevated(E) CO₂ significant enhances photosynthesis, the average have exceed long time elevated CO₂. While shift E to A has opposite exhibition, the photosynthesis is lower than atmosphere treatment. Elevated CO₂ also enhances WUE (water use efficiency), so tea seedling can obtain more water from environment. This is very important to tea seedling.This paper studies the effect of water, temperature, photoperiod and CO₂ to the biomass and photosynthesis of tea seedling. It is provided foundation of the niches for tea seedling to importance ecological factors. Our study has important meaning to direct tea seedling.