摘要
对湘北地区6年生四川桤木(Alnus cremastogyne)人工林不同径级根系生物量分布、根长、比根长、根长密度的空间分布特征进行研究。结果表明:四川桤木人工林大根、中根、小根、细根生物量分别占林分根系生物量总和的55%、22%、14%、9%;约66%的根系生物量集中在0～30cm土层;不同径级根系根长变化趋势是:细根>小根>大根>中根,比根长的变化趋势是:细根>小根>中根>大根;各径级根长密度变化趋势各不相同:垂直方向上,在0～60cm土层,大根的根长密度随土层深度的增加先增后降,中根、小根、细根的根长密度随土层深度的增加而减小,水平方向上,在0～80cm距离,大根的根长密度随距树干距离的增加而减小,细根的根长密度随距树干距离的增加而增大,中根、小根的根长密度在距树干0～60cm内逐渐减小,而在距树干60～80cm又略有增加。
Investigations were conducted on different diameter class root biomass distribution, root length, specific root length（SRL） and root length density （RLD）of 6-year Alnus cremastogyne plantation in the north Hunan province. The results showed that biomass of big root, middle root, small root and fine root accounted for 55%, 22%, 14%, 9% of the total root biomass, and about 66% of root biomass distributed in 0-30 cm soil layer. The order of different diameter class root length was as follows： fine root small root big root middle root, and that of SRL was： fine root small root middle root big root, and that of RLD was different. Root length density of different diameter root had different distribution vertically and horizontally.
出处
《浙江林业科技》
北大核心
2010年第5期42-45,共4页
Journal of Zhejiang Forestry Science and Technology
基金
国家林业局重点项目"南方桤木人工林生态系统可持续经营开发应用"(2008-12)
关键词
四川桤木
根系
生物量
比根长
根长密度
Alnus cremastogyne
root system
biomass
specific root length
root length density
