aking two functions of landscape and environmental protection as a main target, improvement of four types of forest form in Laoshan National Forest Park was carried out. Pure forest community of Pinus massoniana ( A, ) , pure forest community of Celtis sinensis ( B, ), coniferous mixed forest community of Metasequoia glyptostroboides-Platycladus orkntalis ( C{) and broadleaved mixed forest community of Quercus acutissima-Celtis sinensis ( D,) mainly containing deciduous tree were respectively transformed to community of Pinus massoniana-Rhododendron pulchrum ( A2) , mixed forest community of Celtis sinensis-Sapium sebiferum-Osmanthus fragrans-Ilex cornuta-Photinia xfraseri * Red Robin ' -Scilla scilloides ( B2 ) , coniferous and broadleaved mixed forest community of Metasequoia glyptostroboides-Platycladus orientalis-Liquidambar formosana-Broussonetia papyrifera-Trachycarpus fortunei-Liriope platyphylla (C2) and broadleaved mixed forest community of Quercus acutissima-Celtis sinensis-Cinnamomum camphora-Ligustrum lucidum-Osmanthus fragran-Yucca gloriosa-Pittosporum tobira-Liriope platyphylla-Trachelospermum jasminoides (D2) mainly containing evergreen tree. And taking two aspects of community structure and benefit, selecting ten evaluation indexes including canopy density, species richness, landscape-level structure, crown horizontal projection overlap area, ratio of evergreen to deciduous species, absorption ability to harmful gas, sluggish dust and sterilization ability, seasonal change, landscape beautiful degree and recreation resources and according to weight and valuation of every index, the evaluation system of improvement model of forest form for landscape and environmental protection in urban forest park was established by analytic hierarchy process ( AHP). The evaluation result shows that scores of different indexes and comprehensive scores of forest form for different communities after transformation all are higher than those before transformation. Especially, landscape-level structure, seasonal change and landscape beautiful degree of community D2 are the best with the strongest environmental purification function, realizing the organic combination of landscape and environmental protection. It is suggested that improvement of community model for landscape and environmental protection in urban forest park must consider physiological-ecological characteristics of plant itself, and also emphasize beauty of individual plant and community.%以实现景观和环保2项功能为主要目标,对老山国家森林公园的4类群落林相进行改造,分别将马尾松(Pinus massoniana)纯林群落(A1)、朴树(Celtis sinensis)纯林群落(B1)、水杉—侧柏(Metasequoia glyptostroboidesPlatycladus orientalis)针叶混交林群落(C1)和以落叶树为主的麻栎—朴树(Quercus acutissima-Celtis sinensis)阔叶混交林群落(D1)改造成马尾松—锦绣杜鹃(P.massoniana-Rhododendron pulchrum)群落(A2)、朴树—乌桕—桂花—枸骨—红叶石楠—绵枣儿(C.sinensis-Sapium sebiferum-Osmanthus fragrans-Ilex cornuta-Photinia×fraseri‘Red Robin’—Scilla scilloides)混交林群落(B2)、水杉—侧柏—枫香树—构树—棕榈—阔叶山麦冬(M.glyptostroboides-P.orientalisLiquidambar formosana-Broussonetia papyrifera-Trachycarpus fortunei-Liriope platyphylla)针阔叶混交林群落(C2)和以常绿树为主的麻栎—朴树—香樟—女贞—桂花—凤尾丝兰—海桐—阔叶山麦冬—络石(Q.acutissima-C.sinensisCinnamomum camphora-Ligustrum lucidum-Osmanthus fragran- Yucca gloriosa-Pittosporum tobira-Liriope platyphyllaTrachelospermum jasminoides)阔叶混交林群落(D2).应用层次分析法(AHP),从群落结构和群落效益2方面,选取郁闭度、物种丰富度、构景层次、树冠水平投影重叠面积、常绿落叶比、吸收有害气体能力、滞尘与杀荫能力、季相变化、景观优美度和游憩资源10项评价指标,根据各指标的权重和赋值建立了城市森林公园景观环保型林相改造模式的评价体系.评价结果显示:改造后的群落林相各项指标得分值及综合评分值均高于改造前的群落,特别是群落D2的构景层次、季相变化与景观优美度最佳,对环境的净化功能最强,实现了景观与环境保护的有机结合.结果表明:城市森林公园景观环保型群落模式改造既要考虑植物自身的生理生态特征,也要注重植物的个体美与群体美等因素.
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