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本文从土壤养分和叶养分状况方面对水曲柳、落叶松混交林进行了增产机理的研究。结果表明,一年中混交林及纯林土壤速效养分和叶养分含量随季节而异。生长季内,落叶松带土壤的速效磷浓度远高于水曲柳带,最高可达3.50 mg/100g,是后者的2—3倍。与落叶松最邻近的水曲柳,叶中氮含量比纯林提高12.7％—80.8％,含磷为13.4％—140.8％。这两树种对养分吸收的非同步性缓和了种间竞争。总的结论是,生长季内,落叶松带土壤的高浓度速效磷改善了邻近水曲柳的生长条件,是其增产的重要原因。
In this paper, from the aspects of soil nutrient and leaf nutrient status, the yield-increasing mechanism of Fraxinus mandshurica and Larch mixed forest was studied. The results showed that soil available nutrients and leaf nutrient contents in mixed forest and pure forest varied with seasons. During the growing season, the available phosphorus concentration in the soil of the larch was much higher than that of the ash, up to 3.50 mg / 100g, which was 2-3 times of the latter. Compared with the closest larch manchurian ash, the leaf nitrogen content increased 12.7% -80.8% than the pure forest, phosphorus content of 13.4% -140.8%. Asynchrony in nutrient absorption by both species moderates interspecific competition. The general conclusion is that during the growing season, high concentrations of available phosphorus in the soil of the larch belt improved the growth conditions of the neighboring Fraxinus mandshurica, which is an important reason for its increase.