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1 前言 随着环境条件的改变,了解森林生态系统中,生物和非生物相互关系的知识日益重要。自工业化开始以来,所排放的污染物质不同程度的改变着森林生态系统。在很多地区,酸的沉降使得土壤酸化,从而加速了土壤养分的淋溶。大量含N化合物进入土壤产生富集作用并引起许多植物营养失调。目前,环境变化带来的新问题更加明显。例如,由于释放的CO_2和其他潜在性产生温室效应的气体增加,使温
1 Introduction As environmental conditions change, knowledge of the interrelationships between living beings and non-living beings is increasingly important in understanding forest ecosystems. Since the beginning of industrialization, the pollutants emitted have changed the forest ecosystem to varying degrees. In many areas, acid deposition accelerates acidification of the soil, accelerating leaching of soil nutrients. Large amounts of N-containing compounds enter the soil to produce enrichment and cause many plant malnutrition. At present, the new problems brought about by environmental changes are even more obvious. For example, due to the increased release of CO 2 and other potentially greenhouse-producing gases, warming