两种白刺叶片和沙堆土壤化学计量学特征的比较
首发时间:2010-06-21
摘要:植物叶片氮、磷化学计量学研究中, 氮磷比常作为判断土壤养分限制性的指标,其适用范围从海洋、湖泊等水生生态系统扩展到陆地生态系统。本文以生长在民勤绿洲的毛瓣白刺(Nitraria praevisa)和唐古特白刺(Nitraria tangutorun)为研究对象,分别测定叶片N、P含量以及沙堆各层土壤有机质、N、P含量,以探讨两种不同白刺叶片及其沙堆土壤化学计量学特征的关系。研究结果表明:(1)两种白刺叶片的N、P含量之间均存在显著的正相关关系,即植物叶片N、P元素间具有共变的特性;(2)两种白刺沙堆土壤各项养分指标差异极显著(p < 0.01);(3)毛瓣白刺沙堆土壤的N含量在0-20cm土层存在富集现象,唐古特白刺沙堆土壤的有机质、N、P含量在20-40cm土层存在富集现象;(4)在荒漠生态系统中,水分是最主要的限制性因子,水分匮乏的情况下能否以叶片N:P比作为判定营养元素限制性的标准,值得进一步探讨。
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Comparative of stoichiometry of leaf and soil between two species of Nitraria
Abstract: N: P ratio was often used as an index of resource limitation in many researches focusing on ecological stoichiometry of leaf tissue nitrogen (N) and phosphorus (P) concentrations, and claimed that it is suitable for ecosystem from sea to lake to land. This paper researched two dominant species Nitraria praevisa and Nitraria tangutorun in the arid Minqin oasis, analyzed N and P concentrations of leaf tissue and N, P and soil organic matter (SOM) of three 20 cm deep layers of nebkhas. The results indicated: (1) There was a significant positive relationship for N and P concentrations between the two species,i.e., leaf N and P co-varied; (2) N, P and SOM of nebkhas differed significantly between the two species (p < 0.01) ; (3) N was concentrated at layer of 0 - 20 cm for Nitraria praevisa and N, P and SOM at layer of 20 - 40 cm for Nitraria tangutorun; (4) Water was primary limiting factor in desert ecosystem. We concluded that N: P ratio as an index of resource limition was not suitable in the extreme environments.
Keywords: Nitraria praevisa Nitraria tangutorun leaf N and P stoichiometry
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