摘 要 ：通过收集国内33个森林样地的土壤呼吸和年凋落物量数据，分析中国森林地下碳分配（TBCA）模式。结果表明，中国森林土壤呼吸年通量与年凋落物量呈显著的线性相关(R2=0.3319, P=0.000)，其中成熟林土壤呼吸与年凋落物量间呈显著的线性相关(R2=0.3245, P=0.004)，但未成熟林土壤呼吸与年凋落物量间的线性相关不显著(R2=0.3485, P=0.092)。中国森林的地下碳分配变化范围1.460~25.100 t C hm-2 a-1，平均值为9.217 t C hm-2 a-1；中国森林的TBCA与年均气温相关关系不显著(P=0.196），但与年均降水量则呈显著正相关(R=0.480,P=0.021）。中国森林TBCA和凋落物对土壤呼吸的平均贡献分别为74.2%和25.8%；中国森林TBCA对土壤呼吸的贡献随土壤呼吸增大而增大，而凋落物对土壤呼吸的贡献则随土壤呼吸的增大而降低。
Abstract:Total belowground carbon allocation (TBCA) in China’s forests is estimated from published data on soil respiration and litterfall in 33 plots. Rates of soil respiration and aboveground litter production are significantly correlated in mature (≥45 age) forests and insignificantly correlated in young forests (<45 age). While pooling data of mature and young forests together, a signifcant correlation occurs between soil respiration and litter production. Based on assumption of stead-state of belowground carbon pool in mature forests, estimates of TBCA range from 1.460 to 25.100 t C hm-2 a-1 and average 9.217 t C hm-2 a-1 in China′s forests. TBCA shows significantly correlated to mean annual precipitation and insignificantly to mean annual air temperature. The contributions of TBCA and litterfall to soil respiration averaged 74.2% and 25.8%, respectively. The contribution of TBCA show an increase trend with increase in soil respiration, whereas that of litterfall show an decrease trend.