论文部分内容阅读
2010年7—12月,选取鼎湖山国家级自然保护区亚热带针阔叶混交林,采用全因子控制试验,研究不同类型的凋落物(针叶和阔叶凋落物)添加及氮处理(加氮模拟氮饱和、减氮模拟根吸收)对表层(0～10cm)和下层(20～30cm)土壤有机质分解(呼吸)的影响.结果表明:2010年7—11月间,两种凋落物的添加使土壤-凋落物系统的呼吸速率显著增加,但这种影响在12月消失.减氮和加氮处理均显著增加了土壤-凋落物系统的呼吸.叶凋落物短期内完全分解,对土壤碳分解和积累的影响十分有限,可能不是该系统中土壤有机质的主要来源.通过减少土壤可利用氮模拟根系对氮的吸收能够明显促进土壤有机质的分解.
From July to December in 2010, selected the subtropical coniferous and broad-leaved mixed forest in Dinghushan National Nature Reserve, using full-factor control experiment to study the effects of different types of litter (coniferous and broadleaf litter) addition and nitrogen treatment Simulated nitrogen saturation and simulated nitrogen uptake of nitrogen were applied to the soil organic matter decomposition (respiration) in the surface layer (0 ~ 10 cm) and the lower layer (20 ~ 30 cm) .The results showed that the addition of two litterfalls from July to November in 2010 The respiration rate of soil-litter system was significantly increased, but this effect disappeared in December. Both nitrogen and nitrogen treatment significantly increased the respiration of soil-litter system, and the litterfall was completely decomposed in a short period of time, The effect of decomposition and accumulation is very limited, and may not be the main source of soil organic matter in the system.It can significantly promote the decomposition of soil organic matter by reducing the nitrogen uptake of soil available nitrogen.