内蒙古不同草地类型群落物种多度分布格局分析

摘要

Based on three different grassland types in Inner Mongolia, grassland plants were divided according to different functional groups, and niche overlap model (ONM), the niche priority occupation model (NPM), broken rod model (BSM), advantage priority model (DPM) and random allocation model (RAM) were used to fit the community plant species, and three different grassland types of meadow grassland, typical grassland and desert grassland were analyzed according to the degree of fitting.The aim of this study was to study the relationship between species of different grassland types and to explore the true distribution of plant communities in different grassland types by using mathematical models with different ecological significance.The results showed that the model of plant community could be well patterned in desert grassland (χ2 =224.18, AIC =277.05, BIC =281.16) and meadow steppe (χ2 =186.57, AIC =303.13, BIC =307.53), and the true abundance of the typical grassland community was higher than that of the niche priority occupation model (χ2 =22.29, AIC =246.17, BIC =250.27).In different grassland communities, the number of precipitation in the growing season plays a key role in the multi-degree pattern.The obvious precipitation change in the growing season will affect the grassland community, but the dominant position of the cultivated species will not change.%以内蒙古三种不同草地类型为研究对象,通过野外植被调查,按照不同功能群将草地植物进行划分,并应用生态位重叠模型(ONM)、生态位优先占领模型(NPM)、断棍模型(BSM)、优势优先模型(DPM)和随机分配模型(RAM)与群落植物物种进行拟合,按照拟合程度分析草甸草原、典型草原和荒漠草原三种不同草地类型植物群落物种多度分布格局.结果表明:断棍模型可以较好地拟合荒漠草原(χ2=224.18,AIC=277.05,BIC=281.16)和草甸草原(χ2=186.57,AIC=303.13,BIC=307.53)植物群落植物多度格局,而典型草原的群落植物真实多度与生态位优先占领模型(χ2=22.29,AIC=246.17,BIC=250.27)吻合度高.在不同草地群落中,生长季降水量的多少对多度格局起关键作用,生长季明显的降水量变化会对草地群落造成影响,但建群种的优势地位不会发生改变.