华西雨屏区香樟人工林土壤表层细根生物量和碳储量

Fine root biomass and carbon storage in surface soil of Cinnamomum camphora plantation in Rainy Area of West China

2010年11月_2011年12月，研究了华西雨屏区31年生香樟人_T-林土壤表层（O。30cm）细根生物量及碳储量．结果表明：香樟人工林土壤0～30cm层细根总生物量（活根＋死根）和碳储量的平均值分别为1592．29kg·hm之和660．68kgC·hm-1，其中活细根贡献率分别为91．1％和91．8％．随着土壤深度的增加，香樟1～5级活细根和死细根的生物量及碳储量均显著减少；随着根序等级的升高，香樟活细根生物量及碳储量显著增加．香樟细根总生物量及碳储量均在秋季最高、冬季最低，死细根生物量及碳储量为冬季最高、夏季最低；1级根和2级根生物量及碳储量均在夏季最高、冬季最低，而3～5级根则为秋季最高、冬季最低．土壤养分和水分的空间异质性是导致细根生物量和碳储量变化的主要原因．

Fine root in forest ecosystems plays an important role in global C cycle. In this study, a measurement was made on the fine root biomass and carbon storage in the surface soil （0-30 cm） of a 31 year-old Cinnamomum camphora plantation in the Rainy Area of West China in November, 2010-December, 2011. The total biomass and carbon storage of the fine roots （living and dead） in the surface soil were 1592.29 kg ~ hm-2 and 660.68 kg C ~ hm-2, in which, living fine roots ac- counted for 91.1% and 91.8% respectively. The total biomass and carbon storage of the first five order living roots and dead roots decreased significantly with increasing soil depth, and the living root biomass and carbon storage increased significantly with root order. The sum of the biomass and carbon storage of living and dead fine roots was the largest in autumn and the smallest in winter, but the biomass and carbon storage of the dead fine roots were the largest in winter and the smallest in summer. The biomass and carbon storage of the first two order roots were the largest in summer and the smallest in winter, while those of the last three smallest in winter. The spatial heterogeneity of soil fecting the fine root biomass and carbon storage. order roots were the largest in autumn and the moisture and nutrients was the main factor af-