沈阳城市森林三维绿量的垂直分布

采用抽样调查法对沈阳城市森林5种功能类型的201块有效样地进行了调查,测算了样地内树木的三维绿量,利用将树木绿量汇集于树冠中心点的方法,对沈阳城市森林三维绿量垂直分布进行了研究。结果表明:沈阳城市森林的三维绿量垂直分布呈现典型的正态分布,其变化趋势与三维绿量垂直跨度分布相一致;新栽植树木对三维绿量垂直分布影响较小,三维绿量值更多地取决于三维绿量垂直跨度,即大龄级大树冠树木对三维绿量的贡献值最大。沈阳城市森林三维绿量垂直分布峰值为9 m。风景游憩林、附属林、道路林、生态公益林及生产经营林三维绿量垂直跨越层次依次为4.6、4.0、3.6、3.4、1.8,平均为3.9。风景游憩林和附属林三维绿量跨越层次较为丰富,灌木所占比例较大;生态公益林和道路林层次较为简单,灌木所占比例较小;生产经营林最为简单,三维绿量垂直跨越层次多为1层,三维绿量垂直分布峰值为5 m。

Vertical Distribution of Tridimensional Green Biomass in Shenyang Urban Forests

A survey was conducted among 201 effective sample plots of five functional types of Shenyang urban forests by the method of sampling survey.The vertical distribution of Tridimensional Green Biomass(TBG) of trees in the sample plots in urban forests was studied by means of gathering the TGB of trees in the center point of tree canopy.Results show that TGB vertical distribution of Shenyang urban forests exhibits a standard normal distribution,and its changing trend is consistent with TGB vertical span.Newly planted trees have little influence on TGB vertical distribution.TGB mainly depends upon its vertical span,namely,trees with high age-class and big canopy contribute much TGB.The peak value of TGB vertical distribution of Shenyang urban forests is 9 meters.TGB vertical spans of the five functional types of forests,including landscape and relaxation forest,subordinated forest,road forest,ecological and public welfare forest,and production and management forest,are 4.6,4.0,3.6,3.4 and 1.8,respectively,and the average is 3.9.TGB vertical layers of the landscape and relaxation forest,subordinated forest are abundant,and shrub accounts for a higher proportion.The road forest and the ecological and public welfare forest with lower proportion of shrub cover have simpler TGB vertical layers,while the production and management forest is the simplest with only one vertical layer,and its peak value of TGB vertical distribution is 5 meters.