摘要:
以四川彭州为典型案例, 采用材积源生物量法和土壤剖面分析方法, 对栽植5、10、17、22和26年的人工柳杉林生物量及其土壤碳动态进行了初步研究.结果表明, 柳杉林的生物量随着生长年限的增长而增加, 但与林龄并不呈线性相关.柳杉林的碳储量变化与林木生物量的增长趋势完全一致, 5、10、17、22和26年柳杉林的碳储量分别为19.8、67.58、5.8、162和275 t/hm2.林下土壤剖面有机碳含量的平均值随年份的延长而逐渐上升, 土壤不同层次有机碳含量的变化表现为:0~10 cm>10~30 cm>30~50 cm>50~70 cm, 但集中分布于50 cm以内.土壤有机碳表聚系数随林龄增长而减小, 从5年期到26年期依次分别为14.8、9.68、8.85、5.27和3.86, 表明了林木根系对土壤深层有机碳积累的有力贡献.5、10、172、2和26年的柳杉林土壤碳储量分别为80.4、106、126、164和210 t/hm2.人工柳杉林具有庞大的地上生物量和土壤碳库.
Abstract:
Biomass and soil organic carbon dynamics of Cryptomeria fortunei plantations at 5, 10, 17, 22 and 26 years-old were studied at Pengzhou County, Sichuan Province, employing volume-biomass method and soil profile investigation.Biomass of C.fortunei trees increased with age increasing, but such increases were nonlinear.Carbon storage of C.fortunei was estimated at 19.8, 67.5, 85.8, 162 and 275 t/hm2 in 5, 10, 17, 22 and 26 years-old plantations, respectively.Soil organic carbon also increased with tree age increasing.Organic carbon in soil profile decreased in the order of 0-10 cm > 10-30 cm> 30-50 cm> 50-70 cm, with most distributed within the top 50 cm.The A-0 to C layer ratio of soil organic carbon decreased with increased tree ages;it was sequentially 14.8, 9.68, 8.85, 5.27 and 3.86 for 5-26 years old plantations mentioned above, indicating the contribution of tree root system to soil carbon accumulation in the deeper soil layers.Soil organic carbon storage was 80.4, 106, 126, 164 and 210 t/hm2 in 5, 10, 17, 22 and 26 years-old plantations.These findings indicated that C.fortunei plantations have a vast carbon storage and play an important role in soil carbon sequestration.
百度学术
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