Abstract:

In order to explore the ecological status and interspecific relationship of Camellia sinensis var.assamica,and to provide reference for the subsequent conservation and utilization of Camellia sinensis var.assamica populations,species composition and competition relationship in the Camellia sinensis var.assamica community were studied by sample method and circle method.The results were:1)A total of 395 plant species (including 5 varieties and 1 variant)were recorded in the study,belonging to 217 genera in 102 families.Among them,Rubiaceae,Lauraceae,Fagaceae,etc.are the dominant families,Ficus,Lasianthus,Syzygium,etc.are the dominant genus,and Camellia sinensis var.assamica,Heptapleurum heptaphyllum,Psychotria asiatica,Engelhardia roxburghiana,and Lithocarpus caudatilimbus are the dominant species in the community.2)The competition of Camellia sinensis var.assamica in the community mainly came from interspecies,accounting for 90.02%,and the competition intensity of each species for Camellia sinensis var.assamica was ranked as follows:Camellia sinensis var.assamica>Engelhardia roxburghiana>Heptapleurum heptaphyllum>Lithocarpus caudatilimbus>Wendlandia uvariifolia>Cratoxylum cochinchinense.3)The competition intensity gradually decreased with the increase of the diameter at breast height of Camellia sinensis var.assamica,and there were significant differences between the small tree and the middle tree stage,but there was no significant difference after the large tree stage.The competition intensity of the I,II and III stages accounted for 96.10% of the total competition intensity,indicating that Camellia sinensis var.assamica was under greater competitive pressure at small diameter at breast height and less competition at old tree stage.4)There was a significant negative correlation between the diameter at breast height of Camellia sinensis var.assamica and the competitive intensity.So,in the protection of Camellia sinensis var.assamica,the protection of individuals with small diameter at breast height should be strengthened,so that the transition to large diameter at breast height can be smoothly made,and the cultivation of small tea seedlings and the control of tea fruits should be strengthened to promote their population renewal.

Key words: Yinggeling, Camellia sinensis var.assamica, community species composition, population competition, regression analysis