Plant Diversity Of Wetland In Yanbian Prefecture And Potential Distribution Of Calamagrostis Angustifolia

Based on the 2017 Yanbian Prefecture background survey data and combined with 3S technology,this paper analyzes the spatial distribution of plant diversity characteristics in Yanbian Prefecture and different wetland types from a macroscopic perspective.On this basis,according to the habitat requirements and biological characteristics of Calamagrostis angustifolia Kom.,the appearance of the wetland in the wetland environment is considered to be the phenomenon of drought,so the maximum entropy model is used to evaluate the dominant environmental factors and leaflet of the distribution of the small leaflets.Potential distribution areas,indirectly indicating potential distribution areas for possible drought-producing wetlands.Through the field survey of Yanbian Prefecture in 2017,it was found that there are 588 species of wetland vascular plants in Yanbian Prefecture,belonging to 93 families and 288 genera.Among them,the area composition of the Changbai flora(MA)accounted for 32.64%,the composition of the North China flora(NC)accounted for 20.33%,the composition of the Mongolian flora(MO)accounted for 25.17%,and the composition of the Daxinganling flora accounted for 21.85%..The Patrick richness index of Yanbian wetland plants is between 5.0-36.5,and most of the regional richness index is 11.3-23.9,which decreases according to the index from northwest to southeast.The herbaceous swamp wetland richness index is roughly in the northwest index.West high and low east trend;shrub swamp wetland richness index is generally north low and south high;forest swamp wetland richness index is generally northwest low southeast high,middle richness index is higher,Yanbian state edge is lower;artificial reservoir wetland richness The northwestern part of the index is generally high in the west and low in the east,and the east is in the north and south.The Shannon-Wiener diversity index of Yanbian is between 0.80 and 2.65,and the diversity index of most regions is between 1.17 and 1.91.The change of the index size decreases from the northwest to the middle and then to the southeast.The Shannon-Wiener diversity index of plants showed the highest diversity index in the middle,the west was high in the north and the east was low in the east,and the north was generally high in the north and low in the south.The shrub diversity index was generally in the northwest to southeast,and the diversity index was first.The decrease of plant diversity index in forest marsh wetland is generally decreasing in the northwest to southeast direction;the diversity of river wetland diversity index decreases first and then increases in the northwest to southeast direction,and the diversity index in the southeast is the largest.The artificial reservoir diversity index northwestern diversity index is high in the west and low in the east,and the northeast direction in the northeast direction increases first and then decreases.The Penillo uniformity index in Yanbian Prefecture is between 0.56 and 0.97,and most areas are in the range of 0.724-0.888,decreasing from the northwest to the southeast,and then increasing;the uniformity index of the herbaceous marsh wetland plant in the northwestern part of the study area.The northwest direction index of the index is larger than the southeast;the shrub marsh wetland uniformity index is generally higher than the northeast in the southwest;the forest swamp wetland uniformity index is generally higher in the southwest than the northeast,and the western uniformity index is north high south low and east index.The size of the river is high and the east is low;the river uniformity index is generally lower than the southeast in the northwest;the centrality of the artificial reservoir uniformity index is 0.788-0.864 along the northwest-southeast direction.The indication value of Calamagrostis angustifolia Kom.in Yanbian wetland is 0.628>0.5,which has certain indication significance for the wetland drought in Yanbian.The maximum entropy model was used to predict the ecologically suitable area of Calamagrosti's angusti folia Kom..The high leaf area of Calamagrostis angusti folia Kom.was mainly distributed in the north and central part of Yanbian Prefecture,the west of Wangqing County,the northeast of Antu County and the southern part of Helong,that is,the distribution probability of Yanbian wetland was higher.Potential distribution area.Most of them are distributed in rivers and paddy fields,and there are also shrub swamps in the southwestern part of He long,northern forest swamps,and a small part of the herbaceous marshes in the northeastern part of Dunhua.The area of potential arid wetlands in Yanbian Prefecture is 1717.27km2,accounting for 3.98%of the total research area.There are 6 dominant factors affecting the distribution of Calamagrostis angusti folia Kom.in Yanbion Prefecture,which are:slope direction(contribution rate is 29.65%),seasonal temperature change(contribution rate is 11.40%),soil water content(contribution rate is 12.11%),soil total Potassium content(contribution rate 11.03%),soil organic matter content(contribution rate 9.06%),altitude(contribution rate 7.37%).