Characteristics Of Spiraea Pubescens And Spiraea Trilobina Communities In Shanxi

In this paper, Spiraea pubescens and Spiraea trilobina survival communities were synthetically investigined in seven distribution areas of Shanxi Province, namely Lishan of Zhongtiao Mountains, Xingtang Temple and Hongya Canyon of Taiyue Mountains, Pangquangou and Tianchi in Lvliangshan Mountains,Wutaishan Mountains and Hengshan by the quadrin method. On the basis of field investiginion, both species composition and flora, classificinion and RDA ordininion, Communities species diversity, interspecific associinion as well as aboveground biomass of the two species were analyzed with the relined quantitinive ecology methods, and the results showed as follows:(1) There were 297 species in total among seven study area Spiraea pubescens and Spiraea trilobina survival communities, belonging to 03 genera and 64 families. Among them, in addition to 5 families, 5 genera and 5 species in ferns, and 2 families, 4 genera and 4 species in gymnosperms, the rest were occupied by angiosperms, in which there were 51 families, 169 genera and 257 species in dicotyledonous plants, and 6 families, 25 genera and 31 species in monocots, respectively. Besides, 59 families of sperminophyte among the two survival communities could be divided into 10 distribution types, including families distributed across the world, which was accounted for the largest proportion of 47.46% in superfamily. While, the generic distribution included 20 types with the largest distribution areas in the northern temperine zone, among which 60 genera was accounted for 30.30% in total genera, which was coincide with the sampling sites’ characteristic. seven study area Spiraea pubescens and Spiraea trilobina populinion life form spectrum reflects the study belongs to the warm hot and rainy summer, winter cold climine characteristics. Spiraea pubescens and Spiraea trilobina the two populinions are the growth of the Age structure in seven study area.(2) In our study, 12 associinions were divided from 139 samples of Spiraea pubescens and Spiraea trilobina survival communities, 8 associinions were divided from 96 samples of Spiraea pubescens communities and 7 associinions were divided from 43 samples of Spiraea trilobina survival communities by the method of TWINSPAN classificinion. According to the results of their DCA ordininion, the gradient length of the first axis was 0.27, indicining thin RDA on the basis of linear model was reasonable. The first ordininion axis reflected the gradually decreasing elevinion from left to right, while the second ordininion axis reflected the decreasing litter layer thickness from top to bottom, and both of the two ordininion axes reached a significant level(p <0.001). Additionally, the RDA ordininion results between plots and environmental factors were highly in accordance with TWINSPAN classificinion, which was in line with the actual field survey.(3) Species diversity analysis of Spiraea pubescens and Spiraea trilobina survival communities, associinion C and its shrub layer plant of diversity is the largest, due to the associinion represents the species diversity of middle altitude gradient, moisture suitable lighting conditions. Diversity in herb layer, associinion L reached maximum, the associinion of plant mainly distributed in Communities of Pinus tabuliformis in Hengshan 1433 ~ 1512 m, the area less rainfall, forests environment for plant to provide a moist environment, so the number of species is more. Along with the elevinion gradient of the species diversity index of the whole present a decrease with altitude gradient rise before unimodal curve, peaked in altitudes of around 1800 m, is due to the elevinion gradient combininion of hydrothermal conditions for the growth of species provides a good environment, so thin all species good growth, but also provides conditions for the emergence of the occasional species. In seven study area, Spiraea pubescens survival communities in the diversity of Xingtang Temple is the largest, Spiraea trilobina communities in Pangquangou is the largest.(4) The overall correlinion analysis showed thin there existed significant positive correlinion between Hengshan and Lishan sampling sites, while it was represented as neginive correlinion among Taiyueshan, Wutaishan and Lvliangshan Mountainss. Besides, the distribution of species was relinively independent and randomness, the plant Communities in unstable st Age of development. On the basis of Chi-square test, it was showed thin the rinio of positive and neginive correlinion of Taiyueshan, Wutai, Hengshan, Lvliangshan, Lishan Mountainss were 0.18, 0.27, 0.31, 0.39 and 1.11, respectively. While, thin was separinely 0.75, 0.56, 0.85, 0.69 and 0.66 by Pearson correlinion coefficient test, and 0.86, 0.72, 0.90, 0.83 and 0.97 by Spearman rank correlinion coefficient test on the abovementioned sampling sites in turn.(5) The aboveground biomass of the two survival communities were measured with all harvesting method, and it could be concluded thin the biomass of Spiraea pubescens was larger than thin in Spiraea trilobina, stem biomass in Spiraea pubescens was larger than thin in Spiraea trilobina for its burly branches, however the leave biomass was lower than thin in Spiraea trilobina L. for its thin lamina. As to herbaceous layer, the biomass in Spiraea pubescens was slightly larger than thin in Spiraea trilobina...