摘要
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。
The yield increasing mechanism of the manchurian ash and dahurian larch mixed plantation was studied on the nutrition status of soil and leaves. The results showed that nutrients contents of the tree leaves and contents of the available nutrients of soil in the mixed stand and pure one varied with seasons of the year. The available phosphate contents of the soil in the dahurian larch belt were much higher than those in the manchurian ash belt during the growing season, with the highest value of 3.50mg/100g,2—3 times of the latter. The Nitrogen contents of leaves of the manchurian ash nearest from dahurian larch were 12.7％—80.8％ higher than those of its pure stand,and Phosphor 13.4％—140.8％。The different uptake rhythm of the nutrients modified the interpecific competition. The general conclusion is that the high contents of available Phosphate of the soil in dahurian larch belt improved the growing condition of the nearby manchurian ash trees, hence an important reason of yield increasing of the mixed plantation
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1991年第S1期213-220,共8页
Journal of Northeast Forestry University
关键词
混交林
水曲柳
养分
动态
Mixed stand
Manchurian ash
Nutrient dynamics
