Effects of plantation patterns on photosynthetic characteristics and quality of tea
In this paper,we studied the photosynthetic characteristics and quality of tea tree under different plantation patterns.The net photosynthetic rate curve showed single peak under the pattern Ⅰ(Chestnut cultivation density of 4 m×4 m under intercropping tea,shading degree 50%-60%),and it showed double peaks in the pat-tern Ⅲ(pure tea plantation,shading degree 0) and pattern Ⅱ(Chestnut cultivation density of 4 m×8 m under intercropping tea,shade degree 30%-40%),which is an obvious "midday depression" phenomenon.The net pho-tosynthetic rate and peak value dropped with the shading rising under different patterns.The light compensation point of tea tree under pattern Ⅰ and pattern Ⅱ respectively reduced by 11.95% and 27.41% compared to pattern Ⅲ.It showed that tea tree can reduce the light compensation point,light saturation point under the weak light so as to improve weak light utilization for its growth.Tea bud length,100-bud weight,water content of tea all present pat-tern Ⅰ﹥pattern Ⅱ﹥pattern Ⅲ.In spring,it was significantly higher under pattern Ⅰ and pattern Ⅱ than pattern Ⅲ by 58.14% and 36.04%.The catechin content was lower under pattern Ⅰ and pattern Ⅱ than pattern Ⅲ by 12.97% and 6.4% in spring,31.57% and 36.84% in summer.The caffeine content was higher under pattern Ⅰ and pattern Ⅱ than pattern Ⅲ by 31.18% and 29.83%.The contents of amino acid,catechin and caffeine were higher in spring than in summer.