青藏高原东缘高山森林-苔原交错带土壤微生物生物量碳、氮和可培养微生物数量的季节动态

刘洋, 张健, 闫帮国, 黄旭, 徐振锋, 吴福忠

Seasonal dynamics in soil microbial biomass carbon and nitrogen and microbial quantity in a forest-alpine tundra ecotone, Eastern Qinghai-Tibetan Plateau, China

LIU Yang, ZHANG Jian, YAN Bang-Guo, HUANG Xu, XU Zhen-Feng, WU Fu-Zhong

表1 高山森林-苔原交错带基本特征

Table 1 Basic characteristics of alpine forest-tundra ecotone

样带 Belt transect 暗针叶林Dark-conifer forest 林线Timberline 树线 Treeline 密灌丛 Dense shrub 疏灌丛 Sparse shrub 高山草甸 Alpine meadow 海拔 Elevation (m) 3 900 3 975 4 050 4 105 4 135 4 200 坡向 Slope aspect (°) EN 5 EN 4 EN 5 EN 5 EN 3 EN 3 坡度 Slope degree (°) 32 34 40 36 38 34 木本植物平均高度 Wood average height (m) 22.0 14.0 8.0 5.0 1.5 – 草本植物平均高度 Herbage average height (cm) 10 20 50 35 20 10 郁闭度 Crown density (%) 80 75 70 65 20 – 草本植物盖度 Cover degree of herb (%) 20 30 40 60 90 85 苔藓厚度 Thickness of moss (cm) 10.0 4.5 4.0 1.8 0.5 0.6 枯落物厚度 Thickness of litter (cm) 9.0 8.0 5.8 4.5 2.5 1.2