Effects of understory shrubs on growth and photosynthesis of Osmanthus fragrans'Xionghuang'
According to different planted shrubs under Osmanthus fragrans'Xionghuang',the study area was divided into 5 plot types(A:planting Camellia japonica;B:planting Acerpalmatum'Atropurpureum';C:planting Loropetalum chinense var.Rubrum;D:planting Euonymus japonicus'Aurea-marginatus';E:control).The effects of different shrubs on the growth and photosynthesis of O.fragrans'Xionghuang'were studied with the morphological and structural indexes of shrubs(height,density and coverage)as variables,and the morphological and structural indexes of the understory shrubs most suitable for the growth of O.fragrans Xionghuang'were determined,which provided scientific basis for solving the problem of slow growth.The results showed that:(1)The understory shrubs promoted the growth of O.fragrans'Xionghuang',among which B had the most promotion effect,followed by C,and the effect of B on the branch growth of O.fragrans'Xionghuang'at the first,second,third and fourth time was significantly higher than that of A,D and E(P＜0.01).(2)The manifestations of Pn,Gs and Tr were B＞C＞D＞A＞E,Pn and Gs of B and C were significantly different from those of A,D and E(P＜0.01).(3)AQY,Pnmax,LCP and LSP of B were all the largest,while Rd was the smallest,followed by C,and there were significant differences between B,C with E treatment(P＜0.01).(4)Branch growth was positively correlated with Pn,Gs,Tr,AQY,Pnmax,LCP and LSP,and negatively correlated with Ci and Rd.(5)Shrub density had a significant effect on branch growth,and shrub density and height had a significant effect on photosynthesis.In conclusion,height and low-density shrubs had the best promotion effect on trees.In the process of planting shrubs,reasonable understory management should be adopted,such as weed removal,fertilization and other measures to promote the height growth of shrubs,and selective cutting and other management measures to control the density of shrubs,so as to give full play to the promotion effect of shrubs on growth of trees.
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维普
