草业学报2025，Vol.34Issue(1)：17-28,12.DOI:10.11686/cyxb2024088
坡向和坡位对祁连山高寒灌丛植物群落多样性的影响
Effects of slope categories of differing aspect and position on plant community diversity in alpine shrubland in the Qilian Mountains
摘要
Abstract
This research investigated the effects of slope categories defined by slope aspect(shady,semi-shady and semi-sunny slope)and slope position(upper,middle and lower position)on the diversity of alpine shrub community in Qilian Mountains,so as to provide a scientific basis for accurate zoning and management or utilization of alpine shrub vegetation in this region.For the above-mentioned slope categories,the community composition and structure,light intensity,and soil physicochemical characteristics of alpine shrubland were systematically measured,a piecewise structural equation model was used to analyze processes influencing shrub community diversity,and path coefficients of slope aspect and position effects were determined.The results showed that the height,cover,aboveground and belowground biomass of herb and shrub were highest at the lower slope position(P<0.05),while the β diversity was highest on the shady slope and lowest on semi-sunny slope(P<0.05).Shannon-Wiener diversity index,richness index and Pielou evenness index of herb,shrub and community decreased from the lower slope position to upper slope position.The light intensity and soil physicochemical characteristics were significantly higher at the lower slope position than at the upper slope position.The piecewise structural equation model showed that slope aspect and slope position affected the diversity of herbs mainly through factors such as light intensity and soil organic matter content,while they affected the diversity of shrubs mainly through factors such as light intensity,soil water content and soil available nitrogen content.For the smaller scale topographic variation investigated,slope aspect and slope position affected the distribution pattern of plant community diversity mainly through factors such as light intensity,soil water content,soil organic matter content and available nitrogen content.Therefore,when collecting data for precise zoning and to plan ecological restoration of degraded grassland in alpine shrubland,it is important to consider the change of plant community microhabitat conditions and the variation of vegetation distribution patterns which are induced by slope aspects and positions arising from small-scale topographic variation.关键词
高寒灌丛/植物多样性/坡向/坡位Key words
alpine shrub/plant diversity/slope aspect/slope position引用本文复制引用
王文虎,王世林,梁国玲,李文,曹文侠..坡向和坡位对祁连山高寒灌丛植物群落多样性的影响[J].草业学报,2025,34(1):17-28,12.基金项目
国家自然科学基金(32060269),国家重点研发计划项目(2022YFD1602307)和国家牧草产业技术体系(CARS-34)资助. （32060269）
