喀斯特不同土壤厚度小生境植物群落物种多样性与生产力  

Karst Different Soil Thickness Small Habitats Plant Community Species Diversity and Productivity

作　　者：杜浩瀚 陈金艺 赵仪洁 郭旭曼 罗杰 刘锦春[1] 龙云[1] DU Haohan;CHEN Jinyi;ZHAO Yijie;GUO Xuman;LUO Jie;LIU Jingchun;LONG Yun(School of Life Sciences,Southwest University,Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education),Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region,Chongqing 400715,China)

机构地区：[1]西南大学生命科学学院、三峡库区生态环境教育部重点实验室、重庆市三峡库区植物生态与资源重点实验室,重庆400715

出　　处：《重庆师范大学学报(自然科学版)》2024年第6期103-110,共8页Journal of Chongqing Normal University:Natural Science

基　　金：国家自然科学基金面上项目(No.31500399);重庆市自然科学基金创新发展联合基金项目(No.CSTB2023NSCQ-LZX0073);重庆市研究生科研创新项目(No.CYS22201)。

摘　　要：喀斯特地区土壤空间分布不均且浅薄,存在不同土壤厚度小生境。土壤是植物生长的基质,土壤厚度影响其中的营养资源量,影响植物生长发育且会改变群落组成和结构。以喀斯特草灌群落为研究对象,调查研究了不同土壤厚度小生境植物群落特征及物种多样性。结果表明:1)在不同小生境下植物物种的生长情况各异,随着土壤厚度的增加,景天科(Crassulaceae)、禾本科(Gramineae)逐渐减少,而豆科(Fabaceae)、蔷薇科(Rosaceae)的重要值增大,菊科(Asteraceae)植物逐渐占有优势地位。2)群落的物种多样性在中等土壤厚度小生境(土深10~30 cm)中较高,因此中等土壤厚度小生境更有利于植物种类和多样性的发展。3)随着小生境土壤厚度加深,群落中优势种地位越来越稳定,优势种种类组成呈现出从草本植物过渡到木本植物的趋势。综上,在喀斯特地区,生境的适宜和生态位的互补使中等土壤厚度的土壤生境中植物种类和多样性更丰富,更利于植物的共生,以促进群落演替进行。The spatial distribution in karst areas is uneven and the soil is shallow,resulting in different niche with varying soil thickness.Soil serves as the substrate for plant growth,and soil thickness affects nutrient availability,plant development,and community characteristics.It focuses on grassland communities in karst areas to explore the characteristics of plant communities and species diversity in habitats with different soil thicknesses.The results show that:1)Plant species growth varies among different habitats;as soil thickness increases,Crassulaceae and Poaceae decrease gradually while Fabaceae and Rosaceae increase significantly,indicating a more dominant position for Asteraceae plants.2)Species diversity of communities is higher in habitats with moderate soil thickness(shallow-medium soils,medium-deep soils),suggesting that moderate soil thickness is more favorable for the development of plant species and diversity.3)As habitat soil thickness deepens,dominant species become increasingly stable within the community,showing a trend from herbaceous plants to woody plants in terms of composition.In conclusion,in karst regions,suitable habitat conditions combined with ecological niche complementarity make moderately thick soils richer in plant species diversity which promotes symbiosis among plants to facilitate community succession.

关 键 词：喀斯特 异质性生境 重要值 物种多样性 植被恢复 

分 类 号：Q948.15[生物学—植物学]