察隅县针阔混交林乔木树种数量特征与空间分布格局
收稿日期: 2022-08-19
修回日期: 2022-10-17
网络出版日期: 2022-12-23
基金资助
西藏高寒植被生态安全重点实验室开放课题(STAQ-2021T-2);中央引导地方项目(XZ202101YD0016C)
Quantitative Characteristics and Spatial Distribution Pattern of Arbor Species in Coniferous and Broad-Leaved Mixed Forest in Chayu County
Received date: 2022-08-19
Revised date: 2022-10-17
Online published: 2022-12-23
空间分布格局是种群与环境及种群间相互作用的反映,是研究森林群落与环境及物种间生态关系的重要手段。以藏东南察隅县车因沟天然针阔混交林为研究对象,采用典型样地法对群落进行调查,分析了群落中主要乔木树种的径级结构,运用时间序列法对各乔木种群数量动态进行预测,采用点格局法分析其空间分布格局及空间关联性。结果表明:1)群落中乔木树种主要为察隅冷杉、华山松、糙皮桦等3种,且各种群数量在径级上的分布总体呈现为小径级数量偏多,之后随径级的增大,种群数量呈无规律波动,说明该群落处于不稳定状态;2)时间序列分析表明,群落中察隅冷杉、华山松与糙皮桦种群各龄级数量在未来2,4,6个龄级时间总体呈增加趋势,据调查,该区域种群幼苗虽多,但更新不足,而时间序列预测无法考虑这一生态过程;3)各种群小树均以聚集分布为主,而大树的空间分布格局则表现出一定的多元化特征;4)大树整体与小树整体之间的空间关联性及各种群大树之间的空间关联性因样地不同呈现多样化,主要分为不相关与负相关两种。
黄迪 , 任毅华 , 杨守志 . 察隅县针阔混交林乔木树种数量特征与空间分布格局[J]. 林草资源研究, 2022 , 0(5) : 118 -128 . DOI: 10.13466/j.cnki.lyzygl.2022.05.015
Spatial distribution pattern is a reflection of the interaction between population and environment,and it is an important means to study the ecological relationship between forest community and environment and species.Taking the coniferous and broad-leaved mixed forest in Cheyingou,Chayu County of southeastern Tibet as the research object,the typical plot method was used to investigate the community,and the diameter structure of the main tree species in the community was analyzed.The time series method was used to predict the population dynamics of each tree,and the point pattern method was used to analyze its spatial distribution pattern and spatial correlation.The results showed that:1)There were three main tree species in the community:Abies chayuensis,Pinus armandii and Betula utilis,and the distribution of the number of each group in the diameter class was generally more than that in the small diameter class.Then,with the increase of the diameter class,the number of the population fluctuated irregularly,indicating that the community was in an unstable state;2)The time series analysis showed that the population numbers of Abies chayuensis,Pinus armandii and Betula utilis in the community would increase in the next 2,4 and 6 years.According to the survey,there were many seedlings in this area,but the renewal was insufficient,and the time series prediction could not consider this ecological process;3)Small trees in all groups were mainly clustered,while the spatial distribution pattern of big trees showed certain diversified characteristics;4)The spatial correlation between big trees and small trees as a whole,and the spatial correlation between various groups of big trees were diversified due to different plots,which were mainly divided into uncorrelated and negatively correlated.
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