Accumulation of glomalin-related soil protein benefits soil carbon sequestration with tropical coastal forest restoration
Accumulation of glomalin-related soil protein benefits soil carbon sequestration with tropical coastal forest restoration
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球囊霉素相关土壤蛋白的积累有利于土壤固碳和热带沿海森林恢复
DOI：
10.1002/ldr.4192
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发表时间：
--
影响因子：
4.7
通讯作者：
Xuli Tang
中科院分区：
文献类型：
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作者：
Jing Zhang;Jian Li;Lingling Ma;Xinhua He;Zhanfeng Liu;Faming Wang;Guowei Chu;Xuli Tang
热带沿海地区由于暴雨，特别是在森林砍伐之后，遭受了严重的土壤侵蚀。丛枝菌根真菌（AMF）的产物Glomalin-related soil protein （GRSP）在植被恢复过程中改善土壤结构和土壤有机碳（SOC）的固存。因此，在四种不同的恢复实践中，研究了GRSP对热带沿海地区土壤性质改善的贡献：荒地（BL，未恢复对照）、外露桉树人工林（EF）、混合阔叶林（MF）和次生林（SF）。结果表明：与BL相比，植被恢复可提取GRSP （EE-GRSP）和总GRSP （T-GRSP）分别增加了3.9 ~ 12.3倍和1.9 ~ 4.6倍，EE-GRSP/SOC和T-GRSP/SOC比例分别为1.6 ~ 2.0%和6.5 ~ 15.8%；土壤中GRSP浓度、土壤有机碳浓度和GRSP/SOC比值均大于或等于富营养化。13C核磁共振分析表明，有机碳中相对易降解的o -烷基- c在MF处理下明显高于EF和SF处理下，而难降解的芳香族c和烷基- c分别在SF和EF处理下最高。GRSP/SOC与芳香碳、土壤团聚体稳定性呈显著正相关。研究表明，GRSP对土壤有机碳的贡献很大，并通过提高土壤团聚体稳定性和顽固性有机碳而有利于固碳。在这些人工或自然生长林修复中，从土壤团聚和有机碳固存的角度来看，原生树种混交林修复是一种很有希望的修复策略。
Tropical coastal areas endure severe soil erosion due to heavy rainfall, especially after deforestation. Glomalin-related soil protein (GRSP), the product of arbuscular mycorrhizal fungi (AMF), improves soil structure and soil organic carbon (SOC) sequestration with vegetation restoration. Therefore, the contribution of GRSP to soil property improvement in a tropical coastal area was performed in four different restoration practices: a barren land (BL, unrestored control), a Eucalyptus exserta planted forest (EF), a mixed broadleaved forest (MF), and a secondary natural forest (SF). Results showed that vegetation restoration practices increased easily-extractable GRSP (EE-GRSP) and total GRSP (T-GRSP) by 3.9–12.3 and 1.9–4.6 times, respectively, compared with BL. The proportions of EE-GRSP/SOC and T-GRSP/SOC were 1.6–2.0% and 6.5–15.8%. The concentrations of GRSP, SOC and the GRSP/SOC ratio were similar or greater under MF than under SF. 13C NMR analysis showed that the relatively easily degradable O-alkyl-C of SOC was significantly higher under MF than under EF and SF, while the recalcitrant aromatic-C or alkyl-C were highest under SF or EF, respectively. A significantly positive relationship was found between the GRSP/SOC ratio and aromatic-C, and between GRSP and soil aggregate stability. Our study indicates that GRSP contributes a large proportion of SOC, and benefits SOC sequestration through increasing soil aggregate stability and recalcitrant SOC. Among these artificial or natural growing forest restorations, the mixed forest restoration practice with native tree species provides a promisingly preferable restoration strategy in heavily eroded land restoration from the aspect of soil aggregation and SOC sequestration.