| Based on the Exochorda giraldii Communities in Shanxi fullinvestigation, according to its distribution, select some region asthe study area of Exochorda giraldii Communities what ZhongtiaoMountains Ruicheng and Lishan, Taiyue Mountains Xingtang Templeand Qiliyu forest, Luliang Mountains Yunqiu shan. Thecharacteristics of Exochorda giraldii communities were studied byusing quantitative ecology methodology, including phenology,species composition, flora, species diversity and spatial pattern. sothat these results can be as the oretical basis for ecologicalconservation of this species and scientific unilization. The resultsshowed that:(1)Exochorda giraldii strong period of growth in mid-April in thestudy area, The size and number of leaves changing fast at this time.Among them, Exochorda giraldii leaf growth and early squaringperiod is early April; flowering is from April to May, Flowering peakis in mid-April, flowering stage is early May. Thus the Exochorda giraldii sustained rational use (edible, ornamental, bee honey) canbe focused on in April to May.(2)Statistics Total151kinds plant species belonging to117genera and48families (including ferns1family,1genera,1kind) ofExochorda giraldii Communities in Study area. Composition ofangiosperm plants in the area plays an important role, and in themajority of dicots, among, Dicotyledonous plants belonging to42families,104genera,137kinds, Monocotyledon plants belonging to5families,12genera,13kinds. As can be seen, speciescomposition of Exochorda giraldii Communities is more abundant.(3)Floristic composition of Exochorda giraldii Communities ismore complex in Study area, including12distribution types and fivevariants. World distribution pattern is the largest in the distributionof families, Pantropic and Temperate and temperate North Americadisjunct distribution accounted for a larger proportion of also; NorthTemperate is the largest in the distribution of genera, and has atypical temperate nature. Can be inferred, Exochorda giraldiiCommunities distributed in significant regional of the temperateclimate of Shanxi.(4)All diversity indices of Exochorda giraldii Communities wereshown a consistent trend in the diversity of size in Study area:Ruicheng and Lishan> Xingtang Temple and Qiliyu forest> Yunqiushan, species diversity tends to decrease, from south to north. Thismay be related to changes in a range of environmental factors ofTemperature, humidity, soil moisture and light intensity, etc. But,Overall, Exochorda giraldii Communities species diversity is stillmore abundant. (5)Age classes of individuals of Exochorda giraldii populationsare not the same density in Study area(Qiliyu forest), The densitiesof four age-classes varied in the order: age-classⅢ> age-classII>age-classI> age-classIV. The middle age-classesII and Ⅲ had manymore individuals than age-classesI and IV, which indicated that thepopulation was currently in decline; All age-classes havesignificantly aggregated distribution characteristics, andage-classIV(d>225cm)are clustered distribution at all scales; Inaddition to the age-classII and age-classIV, all age classes arepositively correlated on smaller scales, and age-classI andage-classIV are positively correlated on all scales. Age classes ofindividuals of Exochorda giraldii populations are not the samedensity in Study area(Qiliyu forest), The densities of fourage-classes varied in the order: age-classⅢ> age-classII>age-classI> age-classIV. The middle age-classesII and Ⅲ had manymore individuals than age-classesI and IV, which indicated that thepopulation was currently in decline; All age-classes havesignificantly aggregated distribution characteristics, and age-classIV(d>225cm) are clustered distribution at all scales; In addition tothe age-classII and age-classIV, all age classes are positivelycorrelated on smaller scales, and age-classI and age-classIV arepositively correlated on all scales.The dominant species in Exochorda giraldii community showedthe characteristics of aggregated distribution on smaller scale,Among them, Periploca sepium and Spiraea salicifolia showedaggregation distribution at all scales, Exochorda giraldii and Forsythia suspensa with the increasing scale show a law thataggregation distribution--random distribution--uniformdistribution;The Point pattern analysis of Exochorda giraldiicommunity, The dominant species in Exochorda giraldii communityshowed the characteristics of aggregation distribution on differentscales; Box-counting dimension analysis of Exochorda giraldiicommunity, the ability to occupy space of dominant species of thedominant species in Exochorda giraldii community, Exochordagiraldii>Forsythia suspensa>Spiraea salicifolia>Periploca sepium;Information dime nsion analysis of Exochorda giraldii community,the scale changes in the degree of Pattern intensity of the dominantspecies in Exochorda giraldii community, Periploca Sepium>Spiraea salicifolia>Exochorda giraldii>Forsythia suspensa;Correlation dimension analysis of Exochorda giraldii community,the relevance of individual space of the dominant species incommunity, Periploca sepium>Exochorda giraldii>Forsythiasuspensa>Spiraea salicifolia. These results suggest that the spatialdistribution pattern of the warm temperate deciduous broad-leavedforest destruction after the formation of secondary shrub: On asmaller scale, Exochorda giraldii population showed aggregateddistribution; Forsythia suspensa population and Exochorda giraldiipopulation is positive correlation; Spiraea salicifolia Population and Exochorda giraldii population is positive correlation; Periplocasepium and Exochorda giraldii population showed negativecorrelation. point pattern analysis and fractal analysis showedconsistent results, revealing the secondary shrub in the warmtemperate deciduous broad-leaved forest destruction after thespatial distribution pattern. Therefore, Planting Exochorda giraldiiin the sunny bare ground or grass canspeed up the process ofsuccession, and in order to increase species diversity, we shouldincrease the number of the Forsythia suspensa and Spiraeasalicifolia as to Sub-dominant species. |
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