滇西北高寒草甸植物群落功能性状与土壤理化性质的关系

doi:10.11686/cyxb2019473

摘要/Abstract

摘要： 通过植物性状来研究植物与环境的关系,有助于解释植物物种的适应性与分布、群落构建过程以及生态系统功能。以滇西北高寒草甸为研究对象,采用RLQ和Fourth-Corner方法分析湿草甸、中生草甸、干草甸和林缘草甸植物群落功能性状与土壤的关系,以明确不同类型草甸植物群落功能性状的差异,不同类型草甸中的关键土壤因子及对其响应敏感的植物功能性状。结果表明,滇西北高寒草甸:1)随着土壤含水量增加,土壤全氮含量增加、土壤容重和土壤碳氮比降低。2)植物生活型以地下芽为主;比叶面积与叶干物质含量显著负相关,比叶面积在4种草甸类型中无显著差异;中生草甸植物多倾向于采用质量上占优势的单粒种子繁殖方式,其他类型草甸则倾向于选择数量上占优势的多粒种子繁殖策略。3)影响群落功能性状的关键土壤因子,中生草甸是土壤pH值、土壤全氮和土壤容重,干草甸是土壤容重,林缘草甸是土壤碳氮比。4)显著影响植物功能性状的关键土壤因子,中生草甸为土壤pH值、土壤全氮和土壤含水量,干草甸中则是土壤pH值、土壤全氮、土壤容重和土壤含水量。5)中生草甸植物对土壤因子响应敏感的功能性状是比叶面积和生活型,干草甸则是叶长宽比、生长型、生活型和繁殖方式。

关键词: 植物功能性状, 土壤理化性质, RLQ分析, Fourth-Corner, 高寒草甸

Abstract: The adaptability and distribution of plant species, the process of the construction of plant communities and the function of an ecosystem can be discussed according to the relationship between plant traits and the plant environment. This research sought to link the variation in plant functional traits, the key soil factors that affect plant functional traits and plant functional traits that show a plastic response to soil factors, using data from different categories of alpine meadow in Northwestern Yunnan Province (NYP). Four categories of typical meadow (hydric, mesic, xeric and forest margin meadow) were selected for study, to explore the relationship between plant functional traits and soil properties using RLQ and Fourth-Corner methods. The results showed that: 1) The content of soil total nitrogen increased, while the soil bulk density and C∶N ratio decreased as the soil moisture increased. 2) Most plants were geocryptophytes in alpine meadows and the specific leaf area was negatively correlated with dry matter of the leaf. There were no systematic significant differences in specific leaf area among these four types of alpine meadows. Mesic meadow plants tended to adopt the strategy of single seed breeding, but plants in the other three meadow categories tended to adopt a multiple-seed breeding strategy. 3) The key soil factors that affected community functional traits were soil pH, soil total nitrogen and soil bulk density for the mesic meadow, soil bulk density for the xeric meadow, and soil C∶N ratio for the forest marginal meadow. 4) Key soil factors that affected plant functional traits were soil pH, soil total nitrogen and soil moisture for the mesic meadow, and soil pH, soil total nitrogen, soil bulk density and soil moisture for the xeric meadow. 5) The specific leaf area and life form were the plastic traits of plants which respond sensitively to soil factors in the mesic meadow, while the leaf length∶width ratio, growth form, life form and reproductive strategy were the plastic traits for plants in the xeric meadow.

Key words: plant functional trait, physicochemical properties of soil, RLQ analysis, Fourth-Corner, alpine meadow

王琇瑜, 黄晓霞, 和克俭, 孙晓能, 吕曾哲舟, 张勇, 朱湄, 曾睿钦. 滇西北高寒草甸植物群落功能性状与土壤理化性质的关系[J]. 草业学报, 2020, 29(8): 6-17.

WANG Xiu-yu, HUANG Xiao-xia, HE Ke-jian, SUN Xiao-neng, LÜZENG Zhe-zhou, ZHANG Yong, ZHU Mei, ZENG Rui-qin. The relationship between plant functional traits and soil physicochemical properties in alpine meadows in Northwestern Yunnan Province, China[J]. Acta Prataculturae Sinica, 2020, 29(8): 6-17.

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