摘要
采用通讯理论中的霍夫曼编码方法研究了岷江源区植物群落复杂性及其与环境因子之间的一般关系,并揭示了群落复杂性与多样性、物种丰富度和均匀度之间的关系。结果表明:2900-3100m和3500-3700m两个海拔段的植物群落有较高的总复杂性。不同群系的总复杂性,表现为森林群系>灌丛群系>草甸群系;云杉林的总复杂性最高,蒿草草甸的总复杂性最低;灌丛群系中,锦鸡儿灌丛的总复杂性最高,沙棘灌丛的总复杂性最低;草甸群系中,苔草草甸和白茅草甸群系总复杂性较高。群落总复杂性与土壤水分和养分之间呈现显著的二次曲线关系。总复杂性与多样性及物种丰富度呈现出极显著的正相关关系;均匀度与结构复杂性有极显著的负相关关系,均匀度较高的群落,其总复杂性和多样性差别较小,结构复杂性较低;结构复杂性对群落内物种数的变化较为敏感,均匀度和物种数共同影响着群落的结构复杂性。
Biocomplexity theory is becoming increasingly important in understanding natural vegetation dynamics. The upper reaches of the Minjiang fiver is the transition zone from the Qinghai - Tibet plateau to the Sichuan basin. It has various vegetation types with complex topography and variable water and heat conditions. In this study, based on the field investigation of plant species and environmental factors in the origin area of Minjiang River, the plant community complexity and its relationship with environmental factors, community diversity, species evenness and richness were studied. The plant formations in origin area have a high total complexity at the altitude ranges of 2900 -3100m and 3500 -3700m. The total complexity is as the following： Forest plant formations 〉 shrub formations 〉 meadow formations. Form. Picea asperata is ranked as the highest in total complexity, Form. Kobresia spp have a lowest one . In shrub formations, Form. Caragana spp. have the highest total complexity, Form. Hippophae rhamnoides have the lowest one. In meadow formations, the total complexity of Form. Carex spp. and Form. Imperata cylindrica are at high level, Form. Kobresia spp. and Form. Sub -alpine are at lower level. The total community complexity has significant quadratic correlations with soil water content and nutrient, it does not grow in a simple linear way with the increase of soil nutrient and water content. Total community complexity is positively correlated with community diversity, evenness and species richness, while structural complexity is negatively correlated with community evenness. Structural complexity is more sensitive than diversity to the change of species in the community, which is not only related to community evenness, but also to community richness. In the communities with a high evenness, the difference between total complexity and diversity is not quite obvious, and structural complexity is lower.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2009年第8期174-179,共6页
Journal of Arid Land Resources and Environment
基金
国家重点基础研究发展规划项目(G2000046807)资助
关键词
群落复杂性
总复杂性
结构复杂性
均匀度
多样性
物种丰富度
环境因子
community complexity
total complexity
structural complexity
evenness
diversity
species rich ness
environmental factors
