Abstract Perennial cropping has been advocated to increase soil C sequestration, but its sustainability and mechanism remain poorly understood. A chronosequence (0, 5, 10, 15, 20-yr) of perennial ramie cropping was identified and used to study the mechanism of sustainable C sequestration of subtropical upland soils. Soil C sequestration rate averaged at 0.93 Mg ha−1 yr−1 within the 20-year chronosequence, with a maximum of 1.65 Mg ha−1 yr−1 during the 5–10th year. This was mainly attributed to the accumulation of organic C in top 50-cm soil, particularly 20–40 cm soil layer. Along the chronosequence, ramie cropping logarithmically increased annual organic input of residues and fine roots by 166%–534%, and surface soil total N, C/N ratios, and water-stability index by 5%–39%, and microbial catabolic diversity by 7%–19% (P

中文翻译：

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多年生苎麻作物可持续增加亚热带高地土壤的碳封存

摘要 多年生作物被提倡以增加土壤固碳，但其可持续性和机制仍知之甚少。确定了多年生苎麻种植的时间序列（0、5、10、15、20 年），并用于研究亚热带高地土壤可持续固碳的机制。土壤碳封存率在 20 年时间序列内平均为 0.93 Mg ha-1 yr-1，在第 5-10 年期间最大为 1.65 Mg ha-1 yr-1。这主要归因于有机碳在表层 50 cm 土壤中的积累，特别是 20-40 cm 土层。沿着时间序列，苎麻种植使残留物和细根的年有机输入对数增加 166%–534%，表层土壤全氮、C/N 比和水稳定性指数增加 5%–39%，微生物分解代谢多样性7%–19% (P