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甘南高寒草甸微地形上植物叶片特征与环境因子的冗余分析

刘旻霞*,车应弟,李俐蓉,焦娇,肖卫   

  1. (西北师范大学地理与环境科学学院, 兰州 730070)
  • 出版日期:2017-09-10 发布日期:2017-09-10

Redundancy analysis of leaf traits and environmental factors of alpine meadow in Southern Gansu Province.

LIU Min-xia*, CHE Ying-di, LI Li-rong, JIAO Jiao, XIAO Wei   

  1. (College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China).
  • Online:2017-09-10 Published:2017-09-10

摘要: 了解植物叶片性状的生态学含义,对于阐明不同自然环境下的群落构建途径,进一步揭示生态系统维持机制具有重要的理论意义。本研究通过测定甘南高寒草甸坡向梯度25科86种植物叶片稳定碳同位素、比叶面积、叶干物质量及叶片营养元素含量等叶片组成特征,分析不同坡向条件下植物叶片特征与环境因子之间的关系。结果表明,北坡南坡梯度上,随着土壤含水量、土壤全磷、土壤有机碳、土壤速效氮、速效磷含量等养分的不同程度降低,土壤温度、光照度及pH值的增加,植物叶片相对含水量、叶片磷含量、比叶面积、叶片钾含量显著减少,而叶片干物质量、相对叶绿素含量及稳定碳同位素值显著升高。冗余分析结果表明,坡向梯度上土壤含水量、土壤全磷、有机碳及速效磷含量与植物叶片含水量、叶片磷含量、比叶面积及叶片钾含量显著正相关,与植物叶片稳定碳同位素值、叶片干物质量及相对叶绿素含量显著负相关。而土壤温度、光照度及pH值与植物叶片稳定碳同位素值、叶片干物质量及相对叶绿素含量显著正相关,与叶片含水量、叶片磷含量、比叶面积及叶片钾含量显著负相关。说明不同环境因子对植物叶片特征的贡献显著不同。其中土壤含水量、土壤全磷含量、土壤温度及pH值等是关键的限制因子。植物叶片性状特征对不同坡向条件下环境因子的这种响应模式反映了高寒草甸微地形生态系统的环境状况和稳定程度。

关键词: 农田土壤, 矿区, 铜陵,

Abstract: Understanding ecological implications of plant leaf traits is helpful in exploring community assembly under different environments and thus in revealing the maintenance mechanism of ecosystems. In this study, we measured the stable carbon isotope (13C), specific leaf area (SLA), leaf dry matter content (LDMC) and leaf nutrient content of 86 herb species in 25 families along a slope aspect gradient of Southern Gansu alpine meadow, and analyzed correlations between the leaf traits of these plants and environmental factors. The results showed that the soil nutrients and soil water content (SWC) decreased along the northnorthwestwestsouthwestsouth slope aspect gradient, and soil temperature (ST), light illuminance (LI) and pH value increased. Leaf traits also showed strong differences at different slopes. LWC, LPC, SLA, LKC decreased significantly, and LDMC, SPAD and 13C values increased significantly along the slope aspect gradient. RDA results showed that LWC, LPC, SLA and LKC were positively correlated with the SWC, soil organic carbon (SOC), total phosphorus (TP), available phosphorus (AP), but negatively correlated with the 13C, LDMC and SPAD. Relationships between ST, LI, pH and leaf traits showed the opposite trend, and the contributions of different environmental factors to leaf traits were different. The SWC, TP, ST and pH value were the key limiting factors. The patterns of responses of leaf traits to environmental factors under the conditions of different slope aspects reflect the environmentsl condition and stability of alpine meadow ecosystems.

Key words: farmland soil, mining area, mercury, Tongling