Quantitative classification and vegetation character-istics of plant communities of Desert Steppe in Gaolan County
[Objective]This research takes quantitative classification and vegetation characteristics of plant com-munities for desert steppe in Gaolan County,and explores the main environmental factors affecting community distri-bution,so as to understand the current status of vegetation resources and provide vital information for ecological resto-ration and species diversity protection.[Method]Based on the vegetation characteristics survey data of 30 grids in the study area,the bidirectional indicator species method(TWINSPAN)and canonical correspondence analysis(CCA)were used to quantitatively classify and sort the plant community composition and the dominant factors affecting the community distribution in Gaolan County.[Result]30 grids were divided into7 categories by TWINSPAN quantita-tive classification method:Community I(Reaumuria songarica+Ajania tenuifolia),Community Ⅱ(Kalidium folia-tum+Allium oreoprasum),Community Ⅲ(R.songarica+Ajania achilleoides),Community IV(K.foliatum+Neopallasia pectinate),Community Ⅴ(Caragana sinica+Stipa breviflora),Community Ⅵ(R.songarica+Stipa bungeana)andCommunity Ⅶ(Asterothamnuscentraliasiaticus+S.bungeana)respectively.There were significant differences in species composition among different communities,and the height and coverage of each community were low.In these communities,Community Ⅰ and Community Ⅲ had the richest species composition and the highest spe-cies similarity,while Community Ⅲ had the highest uniformity index and widest distribution range.The vegetation life-form spectrum was mainly composed of hemicryptophytes and therophytes.The CCA ranking showed that the distribution of communities was most affected by Minimum Temperature of Coldest Month and Temperature Season-ality,followed by Mean Monthly Temperature Range and Annual Mean Temperature.[Conclusion]The main domi-nant species in Gaolan County were R.songarica,A.tenuifolia and A.achilleoides.Temperature is the most impor-tant environmental factor affecting the distribution of plant communities in this area.The community type was single,the structure was simple and the species diversity and richness were low.The government should strengthen the man-agement and protection of plants in this area to ensure ecological security and sustainable development.
Desert SteppeTWINSPANCCAquantitative classification of communityvegetation characteris-tics
万方数据
维普
