Data_Dryad

Master data set for the paper entitled "Aboveground biomass is driven by mass-ratio effects and stand structural attributes in a temperate deciduous forest." This data set contains all the block (9 plots) information in which analyses were run. Each block has UTM coordinates for their location at Powdermill Nature Reserve (PNR) and all the dependent and independent variables used in the analyses. Abbreviated headlines are as follows: "Block_ID" = Block; "UTM_E" = Easting coordinate for block; " UTM_N" = Northing coordinate for block; "Total.biomass_Mg.ha"= Total biomass in mega-grams of all species for each block on a per hectare basis; "Biomass.ACRU_Mg.ha"= Total biomass in mega-grams of Acer rubrum for each block on a per hectare basis; "Biomass.LITU_Mg.ha"= Total biomass in mega-grams of Liriodendron tulipifera for each block on a per hectare basis; "Biomass.ACSA_Mg.ha"= Total biomass in mega-grams of Acer saccharum for each block on a per hectare basis; "Biomass.QURU_Mg.ha"= Total biomass in mega-grams of Quercus rubra for each block on a per hectare basis; "DBH.max"= Maximum DBH per block; "DBH.stdev" = standard deviation of DBH per block; "Elevation_m" = Elevation above sea level in meters for each block; "Aspect_deg" = Aspect direction in degrees for each block; Aspect.dir" = Aspect direction in degrees organized into four categories (NE, NW, SE, and SW); "Slope_deg" = Slope in degrees for each block; "Convexity" =average elevations of the eight adjacent blocks minus the central block's elevation; "Richness" = species richness (counts); "Evenness" = species evenness; "NMS1" = first axis from non-metric multidimensional scaling; "FRic" = Functional richness; "FEve" = Functional evenness; "FDiv" = Functional divergence; "FDis" = Functional diversity; "RaoQ" = Rao’s Quadratic entropy index; "CWM.max.height" = Community weighted mean of maximum tree height; "CWM.min.root.depth" = Community weighted mean of minimum rooting depth; "CWM.seed.count" = Community weighted mean of seed weight; "CWM.wood.density" = Community weighted mean of wood density.

本数据集为论文《温带落叶林地上生物量受质量比效应与林分结构属性调控》的配套主控数据集。本数据集包含所有用于分析的9个样地区块的全部信息。每个区块均附带其在鲍德尔米尔自然保护区（Powdermill Nature Reserve, PNR）的通用横轴墨卡托（UTM）坐标，以及分析中使用的全部因变量与自变量。各缩写表头的含义如下：
"Block_ID": 区块编号；
"UTM_E": 区块东向UTM坐标；
"UTM_N": 区块北向UTM坐标；
"Total.biomass_Mg.ha": 各区块单位公顷内所有物种的总生物量（单位：兆克/公顷）；
"Biomass.ACRU_Mg.ha": 各区块单位公顷内红花槭（Acer rubrum）的总生物量（单位：兆克/公顷）；
"Biomass.LITU_Mg.ha": 各区块单位公顷内鹅掌楸（Liriodendron tulipifera）的总生物量（单位：兆克/公顷）；
"Biomass.ACSA_Mg.ha": 各区块单位公顷内糖枫（Acer saccharum）的总生物量（单位：兆克/公顷）；
"Biomass.QURU_Mg.ha": 各区块单位公顷内红栎（Quercus rubra）的总生物量（单位：兆克/公顷）；
"DBH.max": 各区块的最大胸径（Diameter at Breast Height, DBH）；
"DBH.stdev": 各区块胸径的标准差；
"Elevation_m": 各区块的海拔高度（单位：米）；
"Aspect_deg": 各区块的坡向（单位：度）；
"Aspect.dir": 将坡向划分为东北（NE）、西北（NW）、东南（SE）、西南（SW）四类后的坡向类别；
"Slope_deg": 各区块的坡度（单位：度）；
"Convexity": 凸度，即八个相邻区块的平均海拔减去中心区块海拔的差值；
"Richness": 物种丰富度，以物种数量计数；
"Evenness": 物种均匀度；
"NMS1": 非度量多维标度（Non-metric Multidimensional Scaling, NMS）分析的第一轴得分；
"FRic": 功能丰富度（Functional richness）；
"FEve": 功能均匀度（Functional evenness）；
"FDiv": 功能分歧度（Functional divergence）；
"FDis": 功能多样性（Functional diversity）；
"RaoQ": Rao二次熵指数；
"CWM.max.height": 最大树高的群落加权平均（Community Weighted Mean, CWM）；
"CWM.min.root.depth": 最小根深的群落加权平均；
"CWM.seed.count": 种子重量的群落加权平均；
"CWM.wood.density": 木材密度的群落加权平均。