巨龙竹林分结构及物种多样性特征

调查滇西南巨龙竹在2017-2019年的年龄、直径、密度等林分结构因子，并对其植被组成、物种多样性进行分析。结果表明：巨龙竹林分干龄分布、丛立竹密度分布均呈右偏缓峰状；竹丛年龄分布、直径分布均呈左偏聚集状。2017-2019年林分逐年向更高龄、更大径阶、更高丛立付密度的范围分布，除2018年、2019年的直径分布差异不显著，其余结构特征在各生长季间均呈极显著差异（P<0.01).利用威布尔分布拟合其直径、丛立付密度分布的效果优于其余分布模型（直径的R2>0.93,密度的R>0.99).竹冠授影面积与竹莞面积、丛立付干数均呈极显著高度正相关（P<0.01,R>0.75),与平均胸径、年龄的相关性较弱（R<0.30).林分共计植物种类73种，隶属于39科67属，其中乔木层以巨龙竹为绝对优势植物。

This study investigated stand structural variables including age, diameter and density of Dendrocalamus sinicus (giant dragon bamboo) in southwest Yunnan during 2017–2019, and analyzed its vegetation composition and species diversity. The results revealed that both the stand age distribution and clump bamboo density distribution of the D. sinicus stands displayed right-skewed and gently peaked patterns, whereas the age and diameter distributions of bamboo clumps exhibited left-skewed and aggregated patterns. From 2017 to 2019, the stands gradually shifted toward ranges with older age classes, larger diameter grades and higher clump bamboo density. Except for the non-significant difference in diameter distribution between 2018 and 2019, all other structural characteristics showed highly significant differences across growing seasons (P < 0.01). Fitting the diameter and clump bamboo density distributions using the Weibull distribution yielded better performance than other distribution models, with R² > 0.93 for diameter and R > 0.99 for density. The bamboo canopy shadow area exhibited highly significant and strong positive correlations with bamboo clump base area and the number of bamboo stalks per clump (P < 0.01, R > 0.75), while its correlations with average DBH and stand age were weak (R < 0.30). A total of 73 plant species belonging to 67 genera in 39 families were recorded in the stands, and D. sinicus was the absolute dominant species in the tree layer.

搜集汇总

背景与挑战

背景概述

该数据集研究了滇西南巨龙竹在2017-2019年的林分结构（年龄、直径、密度等）和物种多样性，发现其分布特征和相关性显著。数据属于竹资源高效培育关键技术研究项目，由国际竹藤中心负责，以文档形式提供，需协议共享获取。