为了研究不同生活型植物营养元素含量随季节变化的响应机制,在生长季内,对阿拉善地区荒漠植物霸王(Zygophyllum xanthoxylon)、猫头刺(Oxytropis aciphylla)、沙冬青(Ammopipta nthus mongolicus)、红砂 (Reaumuria soongorica)、驼绒藜(Ceratoides latens)、白刺(Nitraria tangutorum)6种灌木及多裂骆驼蓬(Peganum multisectum)、葡根骆驼蓬(Pegamum nigrllastrum)、无芒隐子草(Cleistogenes songorica)3种草本植物连续观察,采集叶片,分析矿质养分含量和比叶面积(SLA)的季节变化特征,并对牧草的营养均衡价进行了评价,同时探讨了其叶片发育特征与矿质元素含量的关系。结果显示:(1)不同生活型植物在生长季内的SLA变化规律不同,9种植物叶片SLA均在中等偏下的水平。(2)4种常量元素(K、Ca、Na、Mg)含量在生长季内的波动较大,4种微量元素(Fe、Mn、Zn、Cu)含量在生长季内的随月份变化不大,且大部分植物叶片Zn和Cu含量在生长季内维持在"低"水平。(3)9种牧草SLA与矿质元素Cu之间表现出较强的负相关,而与其他元素无显著的相关性。(4)植物种类与采样月份对植物叶片元素的交叉分析显示,植物叶片K、Na、Ca、Mg、Mn、Cu、Zn含量的变异主要受植物种类影响,植物叶片Fe含量的变异主要受植物种类和采样时间的交互作用影响。
We selected six shrubs, including Zygophyllum xanthoxylon, Oxytropis aciphylla, Ammopipta nthus mongolicus, Reaumuria soongorica, Ceratoides lateens, Nitraria tangutorum and three herbaceous plants, including Peganum multisectum, Pegamum nigrllastrum, Cleistogenes songorica from the desert of the Alxa Plateau in north-central China and meanwhile, we also observed their phenological stages from May to October 2011, in order to explore seasonal variations of leaf element content in plant with different growth forms. The results showed that: (1) the specific leaf area of different growth forms in different seasons emerged different variations, but all in medium level.(2) The plant nutrients display different variation in the growing season. The four constant elements(K, Ca, Na, Mg)was greater volatility in the growing seasons, yet four trace elements (Fe, Mn, Zn, Cu) had a little variation. And the majority of plants' elements( Zn and Cu) maintain low level in the growing seasons. (3) Cu and SLA showed a strong negative correlation, the others were without significance correlation. (4) Factorial analysis of variation for each parameter, with sampling date (season) and species as independent variables, showed that leaf K, Na, Ca, Mg, Mn, Cu, Zn contents were mainly determined by plant species. For leaf Fe contents, it was the interaction of sampling date (season) and species.
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