Recovery in soil carbon stock but reduction in carbon stabilization after 56-year forest restoration in degraded tropical lands
Recovery in soil carbon stock but reduction in carbon stabilization after 56-year forest restoration in degraded tropical lands
复制标题
退化热带土地经过 56 年森林恢复后，土壤碳储量有所恢复，但碳稳定性有所下降
DOI：
10.1016/j.foreco.2019.03.037
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发表时间：
2019
影响因子：
3.7
通讯作者：
Deqiang Zhang
中科院分区：
文献类型：
--
作者：
Huiling Zhang;Qi Deng;Dafeng Hui;Jianping Wu;Xin Xiong;Jianqi Zhao;Mengdi Zhao;Guowei Chu;Guoyi Zhou;Deqiang Zhang
植树造林被认为是通过在植被和土壤中积累和长期储存碳(C)来缓解大气二氧化碳（CO2）浓度上升的有效方法。然而，目前尚不清楚恢复后森林的土壤C积累能否最终恢复到未受干扰森林的同等水平，而造林对碳稳定的影响则更少。本文对中国南方热带退化森林进行了野外研究。目的是通过比较两种再造林森林[恢复次生林（RSF）和管理桉树人工林（MEP）]与裸地（BL）和附近未受干扰森林（UF）土壤中不同的C含量（0-10 cm和10-20 cm），评估造林后土壤C储量的恢复情况。结果表明：裸地造林56 a后，两层土壤碳储量均显著增加，其中RSF的增加幅度大于MEP，而碳抵抗指数（RI）则有所降低。RSF土壤C储量恢复到与UF相似的水平，但土壤RI仍低于UF，特别是在10-20 cm层。土壤碳存量及其RI的乘积计算出的固碳能力依次为UF > RSF > MEP > BL。研究结果表明，在退化的热带土地上造林可以在几十年内恢复土壤碳储量，但会降低碳的稳定性。
Afforestation is considered as an effective method for alleviating the rising of atmospheric carbon dioxide (CO2) concentration through the accumulation and long-term storage of carbon (C) in the vegetation and soil. However, it is still unknown whether soil C accumulation in the restored forests could eventually recover to the equivalent level of the undisturbed forests and much less is known about how afforestation will affect C stabilization. Here we conducted a field study in degraded tropical forests of south China. The aim was to evaluate the recovery of soil C stock following afforestation by comparing different C fractions in soils (0–10 cm and 10–20 cm) in two reforested forests [a restored secondary forest (RSF) and a managedEucalyptusplantation (MEP)] to those in a bare land (BL) and a nearby undisturbed forest (UF). Results showed that after 56-year afforestation at the bare lands, C stocks in both soil layers were significantly increased with an increase greater in the RSF than the MEP, while C recalcitrant indices (RI) were reduced. Soil C stock in the RSF recovered to a similar level to the UF, but soil RI in the RSF was still lower than the UF particularly in the 10–20 cm layer. The calculated capacity of soil C sequestration with the product of soil C stock and its RI followed the order of UF > RSF > MEP > BL. Our results demonstrate that afforestation on degraded tropical lands could recover soil C stock within a few decades, but C stabilization would be reduced.