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以长白山原始针阔叶混交林优势树种蒙古栎为对象,研究了6—10月生长季不同冠层叶片单位叶面积质量(LMA)、单位质量和单位叶面积的C、N、P含量变化,以及N、P的再吸收效率与利用效率.结果表明:在生长季,蒙古栎冠层上、下部叶片的LMA和单位叶面积C含量(Carea)表现出明显的月动态变化;单位叶面积N、P含量(Narea、Parea)的月变化趋势与单位质量N、P含量(Nmass、Pmass)相似,而用单位叶面积与单位质量表示的N、P再吸收效率无明显差异.冠层位置对N的再吸收效率和利用效率无明显影响,但冠层上部P的再吸收效率和利用效率显著高于冠层下部.在未来气候变化情景下,蒙古栎较高的生存力和竞争力有助于促进生态系统的养分循环.
Taking Quercus mongolica, the dominant species of coniferous and broad-leaved mixed forest in Changbai Mountain, as the object, the changes of leaf mass per unit area (LMA), leaf mass per unit area (C, N, P) And the resorption efficiency and utilization efficiency of N and P. The results showed that the LMA and Carea of the upper and lower leaves of Quercus mongolica showed obvious monthly dynamic changes during the growing season and the leaf area N The monthly variation trend of P content (Narea, Parea) was similar to that of N mass and P mass (P mass), while there was no significant difference in N and P resorption efficiency between unit leaf area and unit mass. N had no significant effect on reabsorption efficiency and utilization efficiency, but the resorption efficiency and utilization efficiency of P in upper canopy were significantly higher than those in lower canopy.Under the climate change scenario, the higher viability and competitiveness of Q. mongolica To promote the ecosystem of the nutrient cycle.