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刘旻霞.甘南高寒草甸植物元素含量与土壤因子对坡向梯度的响应*.生态学报,2017,(24).http://dx.doi.org/10.5846/stxb201611302456  
甘南高寒草甸植物元素含量与土壤因子对坡向梯度的响应*
Response of plant element contents and soil factors to the slope gradient of alpine meadow in Gannan
投稿时间:2016-11-30  修订日期:2017-07-14
DOI: 10.5846/stxb201611302456
关键词高寒草甸  叶片元素含量  叶片含水量  相对叶绿素  土壤因子
Key Wordsalpine meadow  leaf element content  leaf water content  SPAD  soil factors
基金项目国家自然科学基金项目(31360114)
作者单位E-mail
刘旻霞 西北师范大学地理与环境科学学院 xiaminl@163.com 
摘要点击次数 185
全文下载次数 49
摘要:
通过测定甘南高寒草甸不同坡向条件下25科86种植物叶片氮(N)、磷(P)、钾(K)含量、有机碳(C)含量、叶片含水量和相对叶绿素(SPAD)值,以及不同坡向的土壤含水量、有机碳、全氮、全磷含量等土壤指标,分析了不同坡向植物叶片元素含量与土壤环境因子之间的关系。 研究结果表明,在南坡-北坡梯度上,随着土壤含水量的增加,植物叶片P含量、叶K含量和叶片含水量显著增加,而相对叶绿素显著降低。土壤养分含量与植物叶片P、叶K含量和叶含水量显著正相关,与叶片相对叶绿素显著负相关。说明不同坡向条件下叶片养分含量受土壤因子的影响显著,土壤的水分及养分状况对植物叶片元素含量的贡献不同。土壤含水量是坡向梯度上影响植物叶片特征的最主要因子。坡向梯度上土壤含水量对植物叶片各种元素含量的影响和植物叶片含水量对不同土壤因子的响应模式支持了生长在南坡的植物能以提高水分和养分利用效率而适应南坡较为干旱和贫瘠的生境。
Abstract:
We measured nitrogen, phosphorus, potassium, organic, water contents and SPAD of plant leaves of 25 families and 86 species at different slopes of alpine meadow in Gannan, and soil physicochemical properties including nitrogen, phosphorus, organic and water contents. The relationship between plant leaf nutrient content and soil environmental factors were analyzed at different slopes. The results show that soil factors had significant effects on foliar traits from south- north slope gradients, Increased soil water content enhanced leaf phosphorus, potassium and leaf water contents in plant leaves, and decreased SPAD significantly. Soil nutrient contents were significantly positively correlated with plant leaf phosphorus, potassium content and leaf water content, but negatively correlated with SPAD. The contribution of soil water content and nutrients to leaf element content were different. We concluded that soil water content was the primary factor affecting foliar characteristics and that leaf water content was particularly influenced by environmental factors in different slopes. Leaf water content in southern slope plant respond to soil conditions reinforces that it were improved water-use efficiency and nutrient use efficiency in this adaptive strategy to drought and barren habitats in the southern slope.
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