摘要
根据定位观测的数据,探讨了杉木人工林凋落物量及其分解过程中碳素释放率.结果表明,14～16年生杉木人工林平均每年约有1 201.24 kg*hm-2凋落物,其中以针叶为最多,占凋落物总量的69.8%,其次是小枝,占24.54%,落果和其它碎屑物质仅占5.63%.不同组分的碳素含量高低顺序排列为:针叶＞落果＞碎屑＞枯枝,变异系数在3.36%～8.24%之间.针叶、枯枝的碳素含量均随时间的推移而下降,而其释放率均随时间的推移而增大,针叶中碳素的释放速率明显高于枯枝中碳素的释放速率.凋落物中碳素的释放规律与总干物质的分解速度并不完全一致.杉木人工林年凋落物碳素释放量约为149.25 kg·hm-2a-1,占凋落时碳素量(548.24 kg·hm-2a-1)的27.22%.经一年的分解后,针叶释放碳素量为120.12 kg·hm-2a-1,占总释放量的81.03%,枯枝、落果及其它碎屑释放碳素量为29.13 kg·hm-2a-1,占总释放量的18.97%.
Based on the date collected from located observation, annual amount of litter and carbon release in its decomposition process were studied in Chinese fir plantation at Huitong, Hunan. Results show that the average annual litter-fall was 1 201.24 kg/hm^2 （dry mass） in the 14-16-year-old Chinese fir plantation, of which needles accounted for 69.84%, twigs, 24.54%, fallen fruit and other fragments, 5.63%; that its carbon contents had some difference, varying with the components of litter-fail, its carbon storage in different components was in the order as follows ; needle〉fallen fruit〉other fragments〉twig; that he annual return of carbon amount gradually increased with the age growth of the forest stands; and that variation of carbon contents in litter-fall possessed difference not only in time but also in components; carbon contents in needles or in twigs decreased but their release ratios increased with the passage of time in the decomposition course, carbon release ratios of needles were higher than that of twigs, and there were some difference between carbon release law of litter-fall and decomposition speed of total dry matter. The annual release amount of carbon was about 149.25kg·hm^-2a^-1 through one year decomposition, occupying 27.22% of carbon amount in the falling, of which carbon release amount of needles was up to 120.12kg·hm^-2a^-1, accounting for 81.03%; twigs, fallen fruit and other fragments, 29.13kg·hm^-2a^-1, accounting for 18. 97%,
出处
《中南林学院学报》
CSCD
北大核心
2005年第6期12-16,共5页
Journal of Central South Forestry University
基金
国家科技重点野外科学观测试验站项目(2000-076)
国家科技部平台建设项目(2002-12-20)
国家林业局重点科研项目(2001-7
2001-29)
关键词
林学
生态学
杉木人工林
凋落物
分解过程
碳释放率
forestry
ecology
Chinese fir plantation
litter
decomposition process
carbon release ratio
