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银杏和水杉是我国特有的珍贵树种。本文对北京公园内银杏和水杉林下的枯叶分解速率进行了试验研究。枯叶失重率:放置380天的银杏为55.63%;放置338天的水杉为53.39%。用指数衰减模型估算枯叶的年腐解率,银杏为0.771克/(克·年);水杉为0.824克/(克·年)。根据枯叶的化学成分分析表明,枯叶的失重率和枯叶化学成分净丧失值的变化趋势相一致。枯叶在一年的分解过程中,碳、氮含量比值随时间的推移而下降。
Ginkgo biloba and Metasequoia are endemic to China. The paper studied the decomposition rate of dead leaves in Ginkgo and Metasequoia forests in Beijing Park. Dead weight loss rate: placed 380 days of Ginkgo is 55.63%; 338 days of Metasequoia placed 53.39%. The exponential decay model was used to estimate the annual decomposition rate of dead leaves, with 0.771 g / (g · year) of Ginkgo biloba and 0.824 g / (g · year) of Metasequoia glyptostroboides. According to the analysis of the chemical components of the dead leaves, the rate of weight loss of the dead leaves and the net loss of the chemical components of the dead leaves are consistent. Dead leaves in the decomposition of the year, carbon and nitrogen ratio decreased over time.