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浑善达克沙地长梗扁桃群丛特征及其驱动因素分析

摘要: 植被群丛的稳定对于群落演替乃至区域生态系统安全发挥着关键作用。受气候变化和人类活动影响,长梗扁桃(Amygdalus pedunculata)自然群丛退化严重,面积不断减少,亟需保护。本研究基于浑善达克沙地长梗扁桃群丛35个样方的数据,通过典范对应分析(Canonical Correspondence Analusis,CCA)揭示了长梗扁桃群丛分布的驱动因子以及不同群丛特征与环境因子之间的关系。研究发现,基于立地条件的差异,长梗扁桃群丛可分为4种类型:群丛Ⅰ,长梗扁桃-蒙古韭(Allium mongolicum);群丛Ⅱ,长梗扁桃-西北针茅(Stipa sareptana var. krylovii)-冷蒿(Artemisia frigida);群丛Ⅲ,长梗扁桃-画眉草(Eragrostis pilosa);群丛Ⅳ,榆树(Ulmus pumila)-长梗扁桃-蒙古虫实(Corispermum mongolicum)。大尺度上,温度和海拔是影响长梗扁桃群丛分布的主要环境因子,贡献率分别为13.2%和11.4%。小尺度上,10~20 cm和20~30 cm土壤有机质和海拔是影响群丛结构特征的关键因素。群从Ⅱ和群从Ⅲ的结构特征对土壤因子响应较为敏感,海拔是群丛Ⅰ和群丛Ⅳ结构特征的主要影响因子。本研究明确了温度、土壤和海拔是浑善达克沙地长梗扁桃群丛的主要环境影响因子,而关于土壤和气候对于群丛的交叉影响还有待进一步研究。

Abstract: The stability of plant associations plays a vital role in the plant succession and safety of regional ecosystems. The biome of Amygdalus pedunculata is undergoing severe degradation because of climate change and human activities. Investigation of the characteristics of A. pedunculata associations and the factors affecting them can provide a scientific basis for restoring and managing the degradation of its biome. We conducted a study in Otindag Sandy Land to analyze the characteristics of the four typical A. pedunculata associations based on the surveyed data in 35 quadrats. Canonical correspondence analysis was used to detect the driving factors of the association distribution pattern in this region, and the relationship between species characteristics and environmental variables in each A. pedunculata association. Based on the differences in site conditions, the A. pedunculata community can be divided into four associations: Ⅰ, Amygdalus pedunculata-Allium mongolicum; Ⅱ, Amygdalus pedunculata- Stipa sareptana var. krylovii- Artemisia frigida; Ⅲ, Amygdalus pedunculata- Eragrostis pilosa; and Ⅳ, Ulmus pumila- Amygdalus pedunculata- Corispermum mongolicum. In general, temperature and elevation were the main environmental factors regulating the distribution of A. pedunculata associations with contribution rates of 13.2% and 11.4%, respectively. Soil organic matter (10-20 cm and 20-30 cm) was the determinant affecting the structure of the A. pedunculata associations. Associations I and II are influenced by elevation, growing season temperature, and 0-10 cm soil organic matter; association III is more sensitive to climatic and soil factors; and association IV is regulated by elevation.

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[V1] 2023-05-30 19:19:27 ChinaXiv:202305.00247V1 下载全文
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