川西米亚罗亚高山暗针叶林岷江冷杉和糙皮桦空间格局及其关联性分析

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 川西米亚罗亚高山暗针叶林岷江冷杉和糙皮桦空间格局及其关联性分析 DOI: 10.5846/stxb202103220756 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 中央级公益性科研院所基本科研业务费专项（CAFYBB2016MA004，CAFZC2017M004）；国家重点研发计划课题（2016YFC0502104） Spatial patterns and associations of main dominant species Abies fargesii var. faxoniana and Betula utilis in Miyaluo subalpine dark coniferous forest of western Sichuan, China Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:基于2019年9月完成的川西米亚罗亚高山暗针叶林9.6 hm2动态样地的调查数据，分析了主要优势种岷江冷杉（Abies fargesii var.faxoniana）与糙皮桦（Betula utilis）的径级结构，并运用O-ring统计中的成对相关函数g（r）和g12（r），研究了两个优势种的空间格局及其种内、种间的关联性。结果表明：岷江冷杉与糙皮桦径级分布连续，均呈倒"J"型。岷江冷杉与糙皮桦的不同径级个体主要呈现由聚集分布向随机分布发展的趋势。岷江冷杉的小树对幼树、中树对幼树、中树对小树以及大树对中树的种内相关性在所有空间尺度上均为显著正相关（P<0.05），而相同径级糙皮桦的种内相关性则表现为由显著正相关（P<0.05）逐渐向无显著相关（P>0.05）变化。随着空间尺度的增大，岷江冷杉的大树对幼树、大树和小树由无显著相关（P>0.05）逐渐向显著正相关（P<0.05）变化，糙皮桦的大树对幼树由显著负相关（P<0.05）逐渐向无显著相关（P>0.05）变化。岷江冷杉大树对糙皮桦所有径级个体的种间相关性主要呈现由为显著负相关（P<0.05）逐渐向无显著相关（P>0.05）变化，糙皮桦大径级个体对所有径级的岷江冷杉主要呈现出显著负相关（P<0.05）。岷江冷杉和糙皮桦的空间格局及其关联性随径级、空间尺度的不同而变化。 Abstract:Based on the investigation data from a 9.6 hm2 Miyaluo dark coniferous forest dynamics plot in western Sichuan in September 2019, the diameter at breast height (DBH) size class structure of two dominant species Abies fargesii var. faxoniana and Betula utilis was analyzed. The spatial distribution, intraspecific and interspecific associations of the two dominant species with four different DBH size classes were also illustrated by using paired correlation functions g(r) and g12(r) in the O-ring statistics of spatial point pattern analysis. The DBH size class structure of the two dominant species showed continuously and a reverse "J" type distribution. The individuals of A. fargesii var. faxoniana and B. utilis with different DBH size classes mainly showed a tendency from aggregation distribution to random distribution. The interspecific relationships of A. fargesii var. faxoniana including small trees to saplings, medium trees to saplings, medium trees to small trees, big trees to medium trees showed positively spatial associations, while that of B. utilis presented a trend from significantly positive (P<0.05) to non-obvious associations (P>0.05). With the increase of spatial scale, the relationship between big trees to sapling and between big trees to small trees of A. fargesii var. faxoniana was from non-obvious to significantly positive associations (P<0.05). However, the big trees to saplings of B. utilis showed a change from significantly negative to non-obvious associations (P<0.05). In the meanwhile, the big trees of A. fargesii var. faxoniana to all DBH size classes individuals of B. utilis mainly showed a trend from significantly negative (P<0.05) to non-obvious associations. There were mainly significant negative associations (P<0.05) between individuals with big DBH size classes of B. utilis and all DBH size classes individuals of A. fargesii var. faxoniana (P<0.05). In short, the spatial distribution pattern and associations of A. fargesii var. faxoniana and B. utilis varied with the change of DBH size classes and the spatial scale. 参考文献 相似文献 引证文献