| Gucheng lake is located in the south, gaochun county, nanjing city, jiangsu province XuHe flowed from gucheng lake, gaochun, liyang is water diversion irrigation and navigation between the main channel. In this paper, application of habitat landscape, forest coverage rate, plant community composition investigation and the floristic analysis. In gucheng lake and XuHe peripheral terrestrial ecosystems were analyzed.Research shows that can be seen from the plaque number distribution, gucheng lake basin between habitat patches number distribution of components and the area has the following several ways:the area is large number small patch, such as grass and reservoir pits; Large number of patches, such as artificial surface; Little landscape area is small plaque components, such as needle leaf mixed forest, coniferous forest; This is mainly related to the habitat fragmentation degree of components. From the landscape patch density of components, the fragmentation degree of gucheng lake area component differences, coniferous forest, mixed needle leaf, shrub and herb swamp fragmentation degree is low, artificial surface, reservoir pits, farmland and grass high degree of landscape fragmentation.XuHe river shore to bring the forest coverage rate significantly higher than that of gucheng lake, XuHe compared with gucheng lake forest keep fit better, reach the standard of good of the plains, forest type is given priority to with mixed needle leaf and deciduous broad-leaved forest, a small amount of distribution, shrub and coniferous forest, the forest swamp the smallest percentage. Gucheng lake basin forest coverage rate is low, belong to the lower level, occupied the main advantage, shrubbery deciduous broad-leaved and coniferous forest, mixed needle leaf and forest swamp area is small. Two areas of forest coverage condition comprehensively, overall behind the green coverage rate of jiangsu province (21.6%, monited,2012).Gucheng lake and XuHe river basin forest cover is divided into four types of forest swamp, shrubbery, deciduous broad-leaved forest, coniferous forest, mixed needle leaf and in accordance with the evaluation criteria, in accordance with the forest coverage rate index in plain area belongs to the good.Important habitat retention assessment results show that the above river shore with habitat evaluation standard to evaluate river shore zone. Results show that the area habitat score of basic industry in 11.01 to 23.51. Under different land use types river shore habitat’s comprehensive quality is as follows:wetland> green> agricultural land> land for traffic >residential area of industrial land. This shows that:the influence degree of the wetland in river shore with minimum, basic keep its natural state; Green space through artificial modification, both to a certain extent, maintain the ecological characteristics of the coastal zone, also satisfy people’s aesthetic demand, landscape habitat score after wasteland; Roughly the agricultural land and transportation land use situation, habitat score embodied in medium level; Residential land and industrial land affected intensity, the largest river shore and habitat degradation are the most serious.Statistics of plant species of vascular plants display 102 families,102 genera,587 species, including 17,19 genera and 42 species of pteridophytes, gymnosperms,3,7 genera and 9 species, dicotyledonous plants of 67 families,238 genera,67 species, monocotyledon 15 families,62 genera,62 species, are shown in table 7, polygonaceae, compositae, cyperaceae, gramineae, rosaceae, leguminosae species more. Advantage is a Japanese cedar tree, metasequoia, camphor, privet, poplar, Chinese beech, masson pine, cypress, advantage shrub is broussonetia papyrifera, oleander, advantage herb is xanthium sibiricum, rushes. Evergreen trees, camphor, privet, masson pine, cypress, almost all the trees are planted, shrub besides broussonetia papyrifera almost all is planted.Of angiosperms in families, genera and species level holds an absolute advantage.Gucheng lake area of vascular plants with a total of 102 families, genera and species contained in all the subjects have bigger difference. According to the various branches of genera and species, can be divided into five types:> 20 in large families, including 10 ～ 20 kinds of medium,5～9 species of small and medium-sized, including 2～4 kinds of small families and only contains one kind of monotype.Gucheng lake in the composition of vascular plants, containing more than 20 kinds of large families and there are 5 families, minimum accounted for the proportion of the total number of families (4.90%), but they contain more genera and species, accounting for 37.31% of the total of the species in the mountain. Contains 5-9 kinds of small and medium-sized in families, genera and species of the proportion of the level showed a certain balance, clover, main aceraceae, cucurbitaceae, flowers, celastraceae, verbenaceae, liliaceous, etc. Many of the plants are the advantages of local vegetation composition, have important ornamental and medicinal value.Gucheng lake flora is mainly composed of herbs. Herbaceous plant growth, herb accounted for 53% of the total of the species in the mountain, the absolute advantage. Herbs grow more in the lake beach and marsh environment, and on both sides of the river bank. Gucheng lake natural levees along the length of the accounts for the proportion of the total length of a small dam, water and land natural transition zone is not much, plants is given priority to with artificial cultivation of green plants, natural wetland development limited, herbaceous plants because of its small size high reproduction rate the competitive advantage of small space required, predominate in the plant life-form composition in this area.The floristic analysis of the genus distribution in tropical, subtropical, temperate distribution box, followed by distribution genera in the world. Temperate components in the distribution types of the genus slightly higher than the tropical elements. Flora showed that gucheng lake has obvious transition property of the convergence of the plant; Although wetland plant with zonal "imprinting", but the characteristic of concealment is obvious. Vascular plants flora of geographical elements are complex, subordinate to the genus, tropical composition ratio decreased, the temperate composition is gradually increasing, showing the nature of the tropical and subtropical to temperate zone.Species diversity varied between different plant communities, the zonal vegetation diversity of evergreen and deciduous broad-leaved mixed forest is higher, the diversity of coniferous forest in the middle and the diversity of shrub, similarity index of different community change between 0.15-0.60. On the whole, the stronger in the geographical elements of the genus of temperate nature, tropical composition is also very rich, but mainly containing 1-2 kinds of small genus, suggest that many tropical composition of genera in this has reached the north boundary of its distribution. That the transition of the obvious.Main plant community was divided into 1 coniferous forest, broad-leaved forest 2,3 brushes,4 wetland vegetation.According to the principles of plant classification, classifying basin plant community investigation, the main terrestrial vegetation can be divided into 5 vegetation types,21 formations; Wetland plant can be divided into four regions; Crops can be divided into six types of vegetation. Land, wetland, crops, vegetation, a total of 32 formation. |
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