摘要
研究青海云杉(Piceacrassifolia)种群不同发育阶段的空间分布格局及其关联性,能揭示其种群的发展规律,推断其潜在的生态学过程或影响机制,进而为该种群的配置、种植和森林的经营与管理等提供指导。该研究基于祁连山大野口流域10.2hm2青海云杉动态监测样地调查资料,分析了青海云杉群落的物种组成和径级结构,并采用点格局方法,通过单变量成对相关函数和双变量成对相关函数对不同年龄阶段青海云杉种群的空间分布格局及其空间关联性进行分析。结果表明:(1)青海云杉种群的径级结构呈倒"J"型分布,属增长型种群,种群自然更新状况良好。(2)青海云杉种群4个径级的个体在小尺度上呈聚集分布,但随着空间尺度的增大,聚集强度逐渐减弱,趋向随机分布;较小径级的个体常呈聚集分布,而随着径级增大,也趋向于随机分布。(3)青海云杉大树个体在小尺度(<4 m)范围内与其他径级个体都呈负关联,随着尺度的增加,大树与幼树表现出正关联且关联性随尺度的增加而减弱,而与小树、中树则表现为无关联或者微弱的负关联;径级相近的个体空间关联性为正关联或无关联,随着个体径级间差距增大,空间关联性转变为无关联或负关联。研究表明,祁连山大野口流域青海云杉种群的分布格局及其关联性随空间尺度和发育阶段而变化,这是由种群自身的生物生态学特性、种内种间关系以及环境条件共同作用的结果。
Aims Exploring the spatial distribution pattern and the association among different developmental stages of Picea crassifolia populations can reveal the succession patterns of the populations, infer their potential ecological mechanisms, and thus provide guidance for the configuration, planting, forest management and management of the populations. Methods Based on the survey data of a P. crassifolia dynamic monitoring plot(10.2 hm2) in Dayekou basin, Qilian Mountains, China. The species composition and diameter structure of the community were analyzed, and the point pattern method was used to analyze the spatial distribution pattern and spatial correlation of P. crassifolia populations at different age stages through univariate pairwise correlation functions and bivariate pairwise correlation functions. Important findings The results showed that:(1) The diameter class structure of P. crassifolia population was an inverted "J" shape, indicating that the population was a growing population and the population was in good natural renewal status.(2) The individuals of four diameter classes in the P. crassifolia population were aggregated at a small scale, but as the spatial scale increased, the aggregation intensity gradually weakened and tended to be randomly distributed. Moreover, individuals of smaller diameter classes used to be aggregated, but as the diameter increased, they also tended to be randomly distributed.(3) The big trees in the P. crassifolia population were negatively correlated with other diameter classes at a small scale(<4 m). As the scale increased, the big trees and young trees showed a positive association and the correlation decreased with increasing scale. However, as the scale increased, big trees showed no or weakly negative correlation with small and medium trees. In addition, the spatial association of individuals with similar diameter classes showed positive or no association. As the difference between individual diameter classes increased, their spatial association changed to no or negative association. In conclusion, the spatial distribution patterns and association of P. crassifolia population in Dayekou Basin of Qilian Mountains varied with the spatial scale and developmental stage, which was the result of the combined effects of the population’s bioecological characteristics, intraspecific and interspecific relationships, and environmental conditions.
作者
拓锋
刘贤德
刘润红
赵维俊
敬文茂
马剑
武秀荣
赵晶忠
马雪娥
TA Feng;LIU Xian-De;LIU Run-Hong;ZHAO Wei-Jun;JING Wen-Mao;MA Jian;WU Xiu-Rong;ZHAO Jing-Zhong;MA Xue-E(College of Forestry,Gansu Agricultural University,Lanzhou 730070,China;Gansu Province Qilian Water Resource Conservation Forest Research Institute(Gansu Qilian Mountain Forest Ecosystem of the State Research Station.Gansu Qilian Mountain Forest Ecological Monitoring and Evaluation International Science and Technology Cooperation Base.Key Laboratory of Hydrology and Water Resources of Forest Ecology and Frozen Soil of Gansu Province,Gansu Qilian Mountain Forest Ecosystem Observation and Research Station),Zhangye,Gansu 734000,China;and School of Life Sciences,Lanzhou University,Lanzhou 730000,China)
出处
《植物生态学报》
CAS
CSCD
北大核心
2020年第11期1172-1183,共12页
Chinese Journal of Plant Ecology
基金
甘肃省自然科学基金(18JR4RA002)。
关键词
祁连山
青海云杉种群
成对相关函数
径级结构
空间分布格局
空间关联
Qilian Mountains
Picea crassifolia population
pairwise correlation function
diameter structure
spatial distribution patterns
spatial association