Investigation And Comprehensive Evaluation Of The Plant Resources Of The Calanthe In Xizang

Wild Calanthe in Tibet is rich in plant resources,but there are few related studies on its resource situation and evaluation at present.In order to give full play to the advantages of Calanthe in Tibet resources,it was developed and utilized sustainably.On the basis of finding out the background data of wild Calanthe in Tibet,introduction,cultivation and management,morphological data collection and analysis were carried out.Analytic hierarchy process(AHP)was used to comprehensively evaluate the resources of Calanthe in Tibet,and the dominant provenances were screened out.It provides a theoretical basis for the rational and scientific development and utilization,and provides ideas for the subsequent development and utilization of native orchidaceae and other ornamental plant groups in Tibet Autonomous Region.The results are as follows:There are 272 species in the genus,67 species in China.According to field investigation and statistical analysis,there are 24 species of Calanthe in Tibet,accounting for 8.82% of the global population and35.82% of the national population.Among them,Calanthe puberula,Calanthe nipponica,Calanthe griffithii,and Calanthe ×yarlungzangboensis is an endemic species in Tibet,and Calanthe lechangensis and Calanthe fugongensis are new records in Tibet.The Calanthe is mainly distributed in the southeastern region of Tibet.In the horizontal distribution,18 species were distributed in Motuo County,with the most species.11 species were found in Bomi County,and 10 in Chau county.There were 1～2 species of prawn Calanthe distributed in Cona county,Yadong County,Jilong County,Milin County and Nyalam county.All the species of Calanthe in Tibet are geophytic orchids.In vertical distribution,the species of Calanthe are the most abundant in the altitude area of 1000～2600m,with 15 species distributed,and 8 species distributed in the altitude area of 2600～3000m.Except for Calanthe nipponica and Calanthe delavayi,which survive and breed at higher altitudes.Calanthe davidii was distributed at an altitude of500～3000m,with the largest span.Calanthe griffithii,Calanthe nipponica,Calanthe × yarlungzangboensis,Calanthe fugongensis,At present,the quantity is small and the distribution elevation is narrow.There are certain differences in 36 phenotypic shapes among 24 species of the genus Calanthe in Tibet.There are significant differences in the degree of variation of the same trait among different species,The distance length(99.83%),the number of flowers(95.44%)and the shape of petals(70.31%)varied greatly,while the ratio of middle sepal length to width(25.76%),lateral sepal width(25.61%)and lateral sepal length to width(24.08%)varied little.There is obvious morphological differentiation among the species of Calanthe in Tibet,The average phenotypic differentiation coefficient among species was 89.47%,and the average intraspecific phenotypic variation accounted for 10.53%,indicating that the main source of phenotypic variation was the inter-specific character variation.The length of a single flower,the length to width ratio of petals,the length to width ratio of bracts,the length to width ratio of a single flower,the unfolding degree of leaves at flowering,the length of the spur,the number of leaves,the shape of the lobes in the labium,the shape of the sepals,and the non refolding of the labium can be regarded as representative forms of the plants of the genus Calanthe in Tibet.Based on representative morphological characteristics,the plants of the genus Calanthe in Tibet are classified into 5 categories by Q-type clustering and combining their ornamental value:(1)Calanthe puberula,Calanthe reflexa,Calanthe nipponica,Calanthe arcuata,Calanthe metoensis,Calanthe brevicornu,Calanthe tricarinata,Calanthe lechangensis,Calanthe fugonensis,Calanthe delavayi,Calanthe × Yarlungzangboensis,Calanthe alpina,Calanthe herbacea,Calanthe triplicata,and Calanthe lyroglossa can be used for potted plants in flower land,flower bowl and flower box.(2)Calanthe clavata,Calanthe griffithii,Calanthe davidii,Calanthe manii,and Calanthe whiteana can be used for flower pond cultivation or as linear cut flower material.(3)Calanthe alismatifolia can be used for flower beds,flower beds,flower borders,flower boxes/bowls,ground covers,and cut flower materials in a ball shape."(4)Calanthe densiflora can be used in flower beds,flower beds,flower borders,flower boxes/bowls,and ground covers.(5)Calanthe sylvatica and Calanthe plantaginea can be used in flower borders or ground covers.Based on the AHP,an evaluation model was established,and 24 species of Calanthe in Tibet were divided into 5 grades according to their ornamental value,development potential and popularization difficulty.Ⅰ.Calanthe alismatifolia,Calanthe densiflora and Calanthe sylvatica have high ornamental value,great development potential and easy popularization;Ⅱ.Calanthe griffithii,Calanthe plantaginea,Calanthe puberula,Calanthe metoensis and Calanthe reflexa have high ornamental value,great development potential and easy popularization;Ⅲ.Calanthe nipponica,Calanthe triplicate and Calanthe davidii have not much ornamental value,not much development potential and not much difficulty in promotion;Ⅳ.Calanthe lyroglossa,Calanthe clavata,Calanthe arcuata,Calanthe brevicornu and Calanthe tricarinata,Calanthe herbacea,Calanthe delavayi,Calanthe alpina,Yarlung Zangbo Calanthe ×yarlungzangboensis has low ornamental value,little development potential and difficult popularization;Ⅴ.Calanthe whiteana,Calanthe fugongensis,Calanthe lechangensis and Calanthe mannii has low ornamental value,little development potential and difficulty in promotion.