甘南高寒草甸不同海拔梯度乳白香青与长毛风毛菊的点格局分析
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引用本文:李博文,刘旻霞,张娅娅,南笑宁,夏素娟,刘 荟.甘南高寒草甸不同海拔梯度乳白香青与长毛风毛菊的点格局分析[J].西北植物学报,2019,39(8):1472~1479
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作者单位
李博文1,刘旻霞1*,张娅娅1,南笑宁1,夏素娟1,刘 荟2 (1 西北师范大学 地理与环境科学学院兰州 7300702 白银市平川区林业局甘肃白银 730913) 
基金项目:国家自然科学基金(31760135,31360114)
中文摘要:乳白香青(Anaphalis lactea)与长毛风毛菊(Saussurea hieracioides)是甘南高寒草甸的主要物种,该研究通过野外群落调查,采用点格局分析法,并应用Riple K函数对不同海拔梯度(2 900 m、3 500 m、3 800 m)的乳白香青和长毛风毛菊种群的空间分布及种间关联性进行分析,旨在了解高寒草甸种群的动态变化机制和发育、演替趋势。结果显示:(1)甘南高寒草甸的乳白香青与长毛风毛菊种群在3个海拔梯度上的分布差异显著,随着海拔的不断升高,长毛风毛菊种群的株数、盖度、生物量均逐渐显著降低,而乳白香青种群则呈先增加后减小的变化趋势。(2)不同海拔梯度的种群密度差异明显,长毛风毛菊种群的密度为海拔2 900 m>3 500 m>3 800 m,乳白香青种群密度为海拔3 500 m>2 900 m>3 800 m。(3)在海拔2 900 m草甸中,乳白香青种群在0~1.9 m尺度呈聚集分布,在1.9~3.9 m尺度呈随机分布,在3.9~5.0 m尺度表现为均匀分布,而长毛风毛菊种群在0~3.5 m尺度呈聚集分布,在3.5~5.0 m尺度范围内则表现为随机分布;在海拔3 500 m草甸中,乳白香青种群在整个研究范围内呈随机分布,而长毛风毛菊种群则表现为聚集分布;在海拔3 800 m草甸中,乳白香青种群在0~4.1 m尺度范围内均为聚集分布,随着研究尺度加大,在4.1~5.0 m尺度则表现为随机分布,长毛风毛菊种群在0~0.6 m和4.4~5.0 m尺度范围内均表现为随机分布,而在0.6~4.4 m尺度范围内呈聚集分布。(4)在2 900 m海拔草甸中,乳白香青种群与长毛风毛菊种群在0~1.9 m小尺度内无关联,在1.9~5.0 m较大尺度内呈负关联关系;在3 500 m海拔草甸中,两种群表现为无关联;在3 800 m海拔草甸中,两种群之间则表现为正关联关系。研究表明,乳白香青和长毛风毛菊种群的分布格局与海拔梯度的变化均密切相关,但不同种群对海拔梯度变化的响应策略不同。
中文关键词:高寒草甸  海拔梯度  乳白香青  长毛风毛菊  点格局分析
 
Analysis of Point Patterns of Different Altitude Gradient of Anaphalis lactea and Saussurea hieracioides in Gannan Alpine Meadow
Abstract:Anaphalis lactea and Saussurea hieracioides are the main species of alpine meadow in Gannan. The study uses a point pattern analysis method through field community surveys, analysis of spatial distribution and interspecific correlation of A. lactea and S. hieracioides populations with different altitude gradients (2 900 m, 3 500 m, 3 800 m) by using Riples K function. The aim is to understand the dynamics of the alpine meadow population and the development and succession trends. The results showed that: (1) there were significant differences in the distribution of the populations of A. lactea and S. hieracioides on three elevation gradients in the alpine meadow of Gannan. With the increase of altitude, the plant number, coverage and biomass of S. hieracioides population decreased gradually. However, the population of A. lactea increased at first and then decreased. (2) The population density of different elevation gradients is obviously different. The density of S. hieracioides population was 2 900 m > 3 500 m > 3 800 m, the density of A. lactea population was 3 500 m>2 900 m>3 800 m. (3) In the 2 900 m altitude meadow, A. lactea population aggregated and distributed in the range of 0-1.9 m, randomly distributed in the range of 1.9-3.9 m, and evenly distributed in the range of 3.9-5 m, S. hieracioides population aggregated and distributed in the range of 0-3.5 m, randomly distributed in the range of 3.5-5 m; In the 3500 m altitude meadow, the population of A. lactea was randomly distributed in the whole study range, while the population of S. hieracioides showed aggregated distribution; In the 3 800 m altitude meadow, the population of A. lactea was aggregated in the range of 0-4.1 m, and the population was randomly distributed in the range of 4.1-5 m with the increase of the research scale, and the population of S. hieracioides showed random distribution in the range of 0-0.6 m and 4.4-5 m, but in the range of 0.6-4.4 m, the population of S. hieracioides showed aggregated distribution. (4) In the 2 900 m altitude meadow, there was no correlation between A. lactea and S. hieracioides populations in the small scale of 0-1.9 m, but negatively correlated in the larger scale of 1.9-5 m; In the 3 500 m altitude meadow, the two populations showed no correlation; In the 3 800 m altitude meadow, there was a positive correlation between the two populations. The results showed that the distribution patterns of A. lactea and S. hieracioides populations were closely related to the change of elevation gradient, and the response strategies of different populations to the change of elevation gradient were different.
keywords:alpine meadow  altitude gradient  Anaphalis lactea  Saussurea hieracioides  point pattern analysis
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