The Primary Study On The Vegetation Investigation And Optimal Modification Of Forest Landscape In Haiwan National Forest Park Shanghai

As the biggest terrestrial ecosystem, forest was rich in species resources and efficient in ecological effects, so the protection and restoration of forest ecosystem was an important measure to improve the global ecosystem. The artificial forest and secondary forest had been an important composition of global forest resources, which had been playing great effect in the environment protection and forest recreation. In a word, the well artificial forest was the basis and key of the forest park construction.In this paper, taking the Haiwan National forest park as example, the optimization technique of artificial forest landscape in coastal saline soil was researched mainly by the way of using the theory and methods of vegetation ecology、population ecology and so on.The problems about plants and communities of forest park was concluded mainly by the way of plant species composition analysis、plant diversity analysis and community structure analysis, and some modification measures to optimize the forest communities with pertinence charcter was also dicussed.First the regional character of Fengxian district which the Hanwan national forest park was located in, included the climate character habitat character, vegetation character and also the historical development of forest park.Secondly comparing with the urban green land, the vegetation characters of tipical plots within the artificial forest was also analyzed from the age-structure analysis of dominat tree species、the area-types analysis and the vegetation types disturbition analysis, and also the problems about plants and communities was discussed. Finaly the general principles and practical measures of forest construction improvement was discussed and some examples were introduced such as pure forest modification、riverside landscape improvement.In this paper, the problems about forest landscape were concluded throught the methond of life type analysis, the area type analysis, plant diversity analysis, the age structure analysis and the important value analysis of typical communities.(l)the less dominant tree species, the more monotone seasonal phenomena. The only evergreen tree species in some area was Cinnamomum camphora, and the total number of main deciduous tree species was5or6, and the the forest had poor stability.(2)The forest density was extremely higher in some area, which had been obstruct for plant growth and maintenance. The aggravation of height growth and the higher rate of overlapping canopy were usual in some forest communities, so the extremely shady environment result in the lower plant diversity, and also the poor landscape effect.(3)The dominat tree species were always small size.The average DBH of dominant tree species of forest park were under10cm, and the average Height of dominant tree species were under10m.So the forest landscape had no remarkable characteristics.(4)The serious degradation of bamboo forest.The poor condition of coastal saline soil and the undemanding choosen of bamboo species lead to the degradeation and death of some bamboo species year by year.(5)some communities had the same age pattern, and the natural regeneration capacity was weak and the regeneration seedlings couldn’t get into fast growth period.some fast growing tree species such as Camptotheca acuminate and Catalpa bungei had less natural regeneration seedlings,so the communities were invaded by Some weed Species such as Solidago Canadensis.The optimal modification of forest landscape has enriched the plant species and community types of Haiwang national forest park, and also increased the plant diversity, which was beneficial to the sustainable development of forest community and it’s ecological service function, and offering reference for other forest park.