Study On The Quantitative Characteristics Of Plant Communities In Low Mountain Forest In South Fujian

Since the reform and opening up,with the rapid economic growth,as well as industrialization and urbanization in Jinjiang City,environmental problems has increasingly highlighting in city.Economic development was one of the obstacles in urban biodiversity conservation and ecological balance.As the main aspect of terrestrial ecosystem,forest is an indispensable natural resource for sustainable development of urban economy.Research on the relationship between community characteristics and environmental factors in Jinjiang city could provide the theoretical basis for forest ecological construction of Jinjiang city,which aim to achieve the sustainable development of forest resources in Jinjiang City.Therefore,taking the forest community of Zimao Mountain and forest in Lingyuan Mountain as the research objects,we compared and analysed their species composition and community characteristics to reveal the coupling relationship between species composition and environment.The main results are as follows:(1)Species in the Zimao Mountain,84 species of 65 genera of 39 families,is more than that of Lingyuan forest Mountain with 60 species of 58 genera of 38 families.the Rosaceae?Gramineae and Myrtaceae have more species in Zimao community.In tree layer,Pinus massoniana and Eucalyptus urophylla have the largest importance value and patch index of Longan is higher.In shrubs layer,are the most important value of Schefflera chinensis and Populus simonii,Lantana camara patch index is higher;The importance value of Schizaea digitata and Dicranopteris dichotoma in the herb layer is the largest;Cirsium japonicum patch index is higher.the gramineae,Compositae and legumes more in the Lingyuan Mountain forest community,The importance value of Casuarina equisetifolia and Pinus massoniana in the tree layer is the largest,Myrica rubra patch index is higher;Shrubs layer are the most important value of Lantana camara and Schefflera octophylla,Clerodendrum cyrtophyllum patch index is higher.The importance value of Arthraxon hispidus and Dicranopteris dichotoma in the herb layer is the largest;Lophatherum gracile patch index is higher.(2)Studies on the Diversity and Stability of Forest Communities in Zimao Mountain and Lingyuan Mountain,The Simpson diversity index,the Shannon-Wiener index and the Pielou index of the forest community in the Lingyuan Mountain forest are higher than those in the Zimao Mountain forest,Shrub layer and herb layer showed Zimao Mountain higher than Lingyuan mountain;The similarity index of Zimao Mountain and Lingyuan Mountain is family of 0.74,the genus is 0.67,The species composition of the community is basically the same.The results of the comparison of the stability of the forest in the Zimao Mountain and Lingyuan Mountain,The Intersection Point Coordinate of the tree layer of Zimao Mountain are 21.327/78.673,Lingyuan Mountain is 26.112/73.888,Are close to 20/80 stability points,Indicating that the tree layers of the two forest communities showed a steady state,The Intersection Point Coordinate of the Shrub layer of Zimao Mountain and Lingyuan Mountain respectively 36.406/63.594 and 32.600/67.401,Both away from the stability point,Both shrub layers were unstable.(3)The ecological width and niche overlap of Zimao Mountain and Lingyuan Mountain were calculated,The results show:Zimao Mountain Forest Community,The niche breadth of the tree layer,shrub layer and herb layer is the largest are respectively Schefflera octophylla?Lantana camara and Tithonia diversifolia,Where the tree layer 171 has 85 pairs of species pairs with niche overlap,Accounting for 49.71%.Lingyuan Mountain Forest Community,The niche breadth of the tree layer,shrub layer and herb layer is the largest are respectively Pinus massoniana,Bredia hirsuta and Cyperaceae,Where the tree layer 136 has 74 pairs of species pairs with niche overlap,Accounting for 54.41%.(4)The degree of correlation between the relationship between the Zimao Mountain and Lingyuan Mountain was determined by the association coefficient,The results show:The number of pairs associated with the pair is more than the number of negative pairs of tree layer and shrub layer in Zimao Mountain and Lingyuan Mountain,there is no strong Negative Association pair,And the correlation coefficient is significantly higher in the range[-0.2,0.2],Indicating that the overall relationship between the Zimao Mountain and Lingyuan Mountain forest community is positively correlated,There are relatively few competing species in the plot,most species are relatively independent.(5)The study of species composition and environmental factors CCA ordination of Zimao Mountain and Lingyuan Mountain showed that:The relationship between soil total phosphorus(TP)and soil total potassium(TK)content in the slope(ASP)of the Zimao Mountain environment and soil environmental factors is closely related to the three species.Simultaneously,The main factors affecting the distribution of species in Lingyuan Mountain are available potassium(AK),pH,Slope,elevation,And there is a strong correlation between them.