怀化城市公园与郊野公园密林质量比较评价

Differences and Comprehensive Evaluation on Fruit Characteristics of Different Parts of Camellia oleifera Canopy

摘要:

通过比较评价怀化城市公园与郊野公园密林的质量,从物种组成、植物多样性、层次结构及三维绿量密度等方面 查找城市公园密林植物配置存在的不足并提出优化措施,旨在为怀化及周边地区在城市公园绿地新建或改建过程中构建 生态型密林提供理论指导和技术支撑 。选取怀化城市公园和郊野公园 40个有代表性的密林为研究对象,以生态功能和视 觉效果为准则层建立公园密林质量评价指标体系,运用主成分分析法确定评价指标权重,采用综合评价指数法计算综合得 分和评价等级 。结果表明:综合评价为 I级的密林 9个,其中郊野公园 7个、城市公园 2个 。 与郊野公园相比较,城市公园 密林主要存在植物种类单 一、乡土植物比例低、乔木植物数量组成不合理:层次结构简单、郁闭度值小:乔木、灌木株数密度 小,总三维绿量密度小等不足 。针对城市公园密林存在的问题,提出了控制部分植物过多种植、充分开发利用乡土植物、合 理引进外来植物、科学合理配置植物等总体优化策略,并对城市各公园的密林提出了具体优化措施。

Abstract:

BycomparingandasesingHuaihuaurbanparksandsuburbanparksintheirdensewood1andqua1ity,thepa- peraimstoproposeoptimizationmeasuresbasedonthedeficienciesfoundindensewood1andp1anta1ocationsofHuaihua urbanparksintermsofspeciescomposition,p1antdiversity,hierarchica1structureandthre-dimensiona1gren biomas density,soastoprovidetheoretica1supportandtechnica1guidancefortheconstructionofeco1ogica1densewood1andsin Huaihuaandsuroundingcitiesintheprocesofconstructionorreconstructionofurbanparkgren space.Theresearch se1ected40typica1densewood1andsinurbanandsuburbanparksinHuaihuacityasresearchobiects,estab1ishedacompre- hensiveasesmentindexsystemforparkdensewood1andsbasedontheireco1ogica1benefitsandvisua1efect,andapp1ied principa1componentana1ysismethodtodeterminetheweightsofasesmentindexes,andcomprehensiveasesmentindex methodtoca1cu1atecomprehensivescoreandasesmentgrade.Theresu1tsareshowedasfo1ows.1)Ninedensewood- 1andsareasesedasgradeI,inc1uding7insuburbanparksand2inurbanparks.2)Comparedwithsuburbanparks,dense wood1andsinurbanparkshavefewerp1antspecies,sma1erproportionofnativep1ants,unreasonab1ecombinationof tres,simp1erhierarchica1structure,sma1ercanopydensity,sma1erdensityoftresandshrubsandsma1ertota1thre- dimensiona1grenbiomasdensity.Basedonthedeficienciesabove,genera1optimizationstrategiesareputforward,such ascontro1ingtheexcesivep1antingofsomep1ants,enhancingthedeve1opmentanduti1izationofnativep1ants,reasona- b1yintroducingexoticp1ants,andrea1izingascientifica1ocationofp1ants,withmorespecificoptimizationmeasuresfor densewood1andsineachurbanpark.