Many tropical coastal areas experience 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 studied for 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 to a large proportion of SOC, and benefits SOC sequestration through increasing soil aggregate stability and recalcitrant SOC. Among these artificial or naturally growing forest areas, a mixed forest restoration practice with native tree species provides a promising restoration strategy for heavily eroded land restoration, in particular improving soil aggregation and SOC sequestration.

中文翻译：

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与glomalin相关的土壤蛋白的积累有利于土壤固碳：热带沿海森林恢复经验

由于暴雨，许多热带沿海地区经历了严重的水土流失，尤其是在森林砍伐之后。丛枝菌根真菌 (AMF) 的产物 Glomalin 相关土壤蛋白 (GRSP) 通过植被恢复改善土壤结构和土壤有机碳 (SOC) 固存。因此，研究了 GRSP 对热带沿海地区土壤特性改善的贡献，研究了四种不同的恢复实践：荒地（BL，未恢复的控制）、桉树人工林（EF）、混交阔叶林（MF）和次生天然林（SF）。结果表明，与 BL 相比，植被恢复实践使易提取 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的比例分别为1.6%~2.0%和6.5%~15.8%。与 SF 相比，MF 下 GRSP、SOC 和 GRSP/SOC 比值相似或更高。¹³C NMR分析表明，在MF下SOC的相对易降解的O-烷基-C显着高于EF和SF下，而难降解芳族-C或烷基-C分别在SF或EF下最高。GRSP/SOC 比值与芳香烃-C 之间以及 GRSP 与土壤团聚体稳定性之间存在显着的正相关关系。我们的研究表明，GRSP 对 SOC 的很大一部分有贡献，并且通过增加土壤团聚体稳定性和顽固的 SOC 有利于 SOC 固存。在这些人工或自然生长的林区中，与本地树种混合的森林恢复实践为严重侵蚀的土地恢复提供了一种有希望的恢复策略，特别是改善土壤聚集和 SOC 固存。