中国森林的地下碳分配

Total belowground carbon allocation in China's forests

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1.460～25.100tChm-2a-1,平均值为9.217tChm-2a-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。

Total belowground carbon allocation （TBCA） in China＇ s fores respiration and litterfall in 33 plots. Rates of soil respiration and aboveground ts is estimated from published data on soil 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.