生物多样性 ›› 2019, Vol. 27 ›› Issue (1): 24-32. DOI: 10.17520/biods.2018222
所属专题: 钱江源国家公园生物多样性保护与管理
收稿日期:
2018-08-09
接受日期:
2019-01-09
出版日期:
2019-01-20
发布日期:
2019-03-15
通讯作者:
王庆刚
基金资助:
Chi Xiulian1,Wang Qinggang2,*(),Guo Qiang3,Yang Xian3,Tang Zhiyao3
Received:
2018-08-09
Accepted:
2019-01-09
Online:
2019-01-20
Published:
2019-03-15
Contact:
Wang Qinggang
摘要:
萌生是植物营养繁殖的重要方式之一, 树木的萌生更新对群落结构的维持、植被的动态和演替具有重要意义。本研究基于古田山常绿阔叶林内处于不同演替阶段的25个30 m × 30 m样方中胸径 ≥ 5 cm的木本植物萌生茎发生情况的调查数据, 应用线性回归模型分析了不同演替群落的萌生特征及其地形解释。结果发现: (1)样地内共有56种木本植物存在萌生现象, 占总物种数的53.8%。(2)群落(样方)水平的萌生能力与海拔显著负相关, 与坡度和坡向的相关性较弱。(3)群落水平的萌生能力与林分年龄显著负相关; 在控制地形因子的影响下, 林分年龄对萌生指标解释量仍然达到20%-30%。萌生个体数和萌生物种丰富度所占比例随林分年龄显著下降, 萌生物种主茎的平均胸径随林分年龄显著增加。研究表明, 古田山常绿阔叶林萌生能力随林分年龄的增大而下降, 可能由演替序列上物种组成的变化(即萌生能力较强物种的多度下降)和群落结构的变化(即大径级个体增多)导致。另外, 萌生能力受到海拔、坡向等地形因素的影响。
池秀莲, 王庆刚, 郭强, 杨弦, 唐志尧 (2019) 古田山常绿阔叶林不同演替群落的萌生特征. 生物多样性, 27, 24-32. DOI: 10.17520/biods.2018222.
Chi Xiulian, Wang Qinggang, Guo Qiang, Yang Xian, Tang Zhiyao (2019) Sprouting characteristics of communities during succession in an evergreen broad-leaved forest on Gutian Mountain, East China. Biodiversity Science, 27, 24-32. DOI: 10.17520/biods.2018222.
萌生能力指标 Sprouting ability index | 变量 Variables | 回归斜率 Coefficient | 解释量 Explained variation (R2) | P |
---|---|---|---|---|
萌生率 Ratio of the number of sprouts to the number of main stems (RS) | 海拔 Elevation | -0.0007 | 0.258 | 0.0095 |
坡度 Slope | -0.0041 | 0.017 | 0.5328 | |
坡向 Aspect | -0.0677 | 0.085 | 0.1567 | |
林分年龄 Forest age | -0.0058 | 0.383 | 0.0010 | |
萌生个体比例 Proportion of sprouting individuals among all individuals (PMSI) | 海拔 Elevation | -0.0003 | 0.262 | 0.0089 |
坡度 Slope | -0.0019 | 0.018 | 0.5193 | |
坡向 Aspect | -0.0378 | 0.129 | 0.0781 | |
林分年龄 Forest age | -0.0023 | 0.295 | 0.0050 | |
萌生个体平均萌茎数 Number of sprouts per sprouting individual (NSMSI) | 海拔 Elevation | -0.0009 | 0.154 | 0.0522 |
坡度 Slope | -0.0065 | 0.015 | 0.5601 | |
坡向 Aspect | -0.0697 | 0.031 | 0.3997 | |
林分年龄 Forest age | -0.0091 | 0.322 | 0.0031 |
表2 萌生能力与林分年龄和地形因子的一元线性回归分析结果
Table 2 Relationships between sprouting ability and forest age and topographical factors
萌生能力指标 Sprouting ability index | 变量 Variables | 回归斜率 Coefficient | 解释量 Explained variation (R2) | P |
---|---|---|---|---|
萌生率 Ratio of the number of sprouts to the number of main stems (RS) | 海拔 Elevation | -0.0007 | 0.258 | 0.0095 |
坡度 Slope | -0.0041 | 0.017 | 0.5328 | |
坡向 Aspect | -0.0677 | 0.085 | 0.1567 | |
林分年龄 Forest age | -0.0058 | 0.383 | 0.0010 | |
萌生个体比例 Proportion of sprouting individuals among all individuals (PMSI) | 海拔 Elevation | -0.0003 | 0.262 | 0.0089 |
坡度 Slope | -0.0019 | 0.018 | 0.5193 | |
坡向 Aspect | -0.0378 | 0.129 | 0.0781 | |
林分年龄 Forest age | -0.0023 | 0.295 | 0.0050 | |
萌生个体平均萌茎数 Number of sprouts per sprouting individual (NSMSI) | 海拔 Elevation | -0.0009 | 0.154 | 0.0522 |
坡度 Slope | -0.0065 | 0.015 | 0.5601 | |
坡向 Aspect | -0.0697 | 0.031 | 0.3997 | |
林分年龄 Forest age | -0.0091 | 0.322 | 0.0031 |
图1 群落萌生率(RS)、萌生个体比例(PMSI)、萌生个体平均萌茎数(NSMSI)及经地形因子拟合解释变异后各萌生能力指标的剩余残差与林分年龄的关系。实线代表线性关系显著即P ≤ 0.05。RS表示萌生率, 即样方内萌茎数与个体数之比; PMSI表示萌生个体比例, 即样方内萌生个体数与所有个体数之比; NSMSI表示萌生个体平均萌茎数, 即样方内的萌茎数与萌生个体数之比。
Fig. 1 Relationships between the ratio of the number of sprouts to the number of main stems (RS), the proportion of sprouting individuals among all individuals (PMSI) and the number of sprouts per sprouting individual (NSMSI) of communities and their residuals after being fitted models by topographical factors and forest age. Solid lines indicate significant relationship with P-value less than 0.05.
图2 萌生物种丰富度、萌生物种丰富度比例、萌生个体数及萌生物种主茎平均胸径与林分年龄的关系。实线代表线性关系显著即P ≤ 0.05, 虚线代表线性关系不显著即P > 0.05。
Fig. 2 Relationships between sprouted species richness, proportion of sprouted species, number of sprouting genets, mean diameter at breast height (DBH) of sprouting genets and forest age. Solid lines indicate significant relationship with P-value less than 0.05, while dash lines indicate insignificant relationship with P-value greater than 0.05.
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