摘要
以金沟岭林场云冷杉林、杨桦次生林和落叶松人工林为研究对象,分别设置郁闭度0.20、0.40、0.60、0.80、1.00样地,采用灌木生物量模型法和草本生物量平均木法,估算出不同林型不同郁闭度林下灌草生物量。结果表明:云冷杉林郁闭度为0.02时灌草生物量最大,郁闭度1.00时,灌草生物量最小,灌草生物量随林分郁闭度的增加而减小;杨桦次生林郁闭度为0.20时灌草生物量最大,郁闭度1.00时,灌草生物量最小,灌草生物量随林分郁闭度的增加而减小;落叶松人工林在林龄较小时,灌草生物量最小,母树林灌草生物量最大。不同林型在同一郁闭度林下灌草生物量差异显著。郁闭度为0.20和0.40时,杨桦次生林灌草生物量均大于云冷杉林;郁闭度为0.60时,灌草生物量由大到小的顺序为云冷杉林、杨桦次生林、落叶松人工林;郁闭度为0.80时,3种林型灌草生物量几乎相等;郁闭度为1.00时,落叶松人工林灌草生物量最大,且其灌木和草本生物量均大于其他两种林型。
With the spruce fir forest, polar-birch secondary forest and larch plantation in Jingouling Forest Farm, we, respective- ly, arranged the samples of different crown densities of 0.20, 0.40, 0.60, 0.80, and 1.00. T shrub biomass model and av- erage herb method were used to estimate the understory biomass of different forests with different crown densities. When the crown density is 0.20, the understory biomass of spruce fir forest is maximum. When the crown density is 1.00, the under- story biomass is minimum. The understory vegetation biomass is decreased with the increase of crown density. In poplar birch secondary forest, the understory biomass is maximum when the crown density is 0.20, and the understory biomass is minimum when the crown density is 1.00, and the understory vegetation biomass is also decreased with the increase of crown density. In different age of larch plantation, when the age is small, the understory biomass is minimum, and in the mother trees, the understory biomass is maximum. Under the same density, the biomass of different forest types is signifi- cantly different. When the crown density is 0.20 and 0.40, the understory biomass of poplar birch secondary are greater than that of spruce fir forest. When the crown density is 0.60, the descending order of understory biomass is spruce fir for- est, poplar birch secondary forest, and larch plantation. When the crown density is 0.80, the understory biomass of three types of forest is almost equal. When the crown density is 1.00, the understory biomass of larch plantation is maximum, and its shrub biomass and herb biomass are greater than those of the other two types.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2016年第9期29-33,39,共6页
Journal of Northeast Forestry University
基金
国家林业局"948"项目(2013-4-66)
"十二五"国家科技支撑计划项目(2012BAD22B02-3)
关键词
云冷杉林
杨桦次生林
落叶松人工林
郁闭度
灌草生物量
Natural spruce fir forest
Polar-Birch secondary forest
Larch plantation
Canopy density
Biomass of shrub and herb
