与菌根相关的土壤蛋白中的顽固碳组分有助于热带森林土壤有机碳的保存。
Recalcitrant carbon components in glomalin-related soil protein facilitate soil organic carbon preservation in tropical forests.
机构信息
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
出版信息
Sci Rep. 2017 May 24;7(1):2391. doi: 10.1038/s41598-017-02486-6.
Glomalin-related soil protein (GRSP) is known as an important microbial by-product which is crucial for preserving or accumulating soil organic carbon (SOC). However, the underlying mechanisms are not well understood. In this study, we investigated the chemical structures of GRSP and its relationship with SOC using C nuclear magnetic resonance (NMR) in three tropical forests. The three forests, including a planted forest (PF), a secondary forest (MF) and a primary forest (BF), were selected to represent the natural successional process after disturbance in southern China. Results showed that the average concentrations of GRSP were (3.94 ± 1.09) mg cm and accounting for (3.38 ± 1.15)% of the SOC in the top 10 cm soil. NMR analysis indicated rich aromatic C (30%) and carboxyl C (40%) in GRSP, and abundant alkyl C (30%) and O-alkyl C (50%) in SOC. The recalcitrance indexes (RI), as defined as the ratio of sum of alkyl C and aromatic C over sum of O-alkyl C and carboxyl C, was (98.6 ± 18.9)%, (145.5 ± 10.9)% and (20.7 ± 0.3)% in GRSP higher than that in SOC in the PF, MF and BF, respectively. This study demonstrated that the stubborn structure of GRSP probably regulate the resistance of SOC sequestration in tropical forests, especially in the planted and secondary forests.
胶磷矿相关土壤蛋白（GRSP）被认为是一种重要的微生物副产物，对于土壤有机碳（SOC）的保存和积累至关重要。然而，其潜在机制尚不清楚。本研究采用碳核磁共振（NMR）技术，在三个热带森林中研究了 GRSP 的化学结构及其与 SOC 的关系。这三个森林包括人工林（PF）、次生林（MF）和原始林（BF），选择它们代表了中国南方干扰后自然演替的过程。结果表明，GRSP 的平均浓度为（3.94±1.09）mg cm，占表层土壤（0-10 cm）SOC 的（3.38±1.15）%。NMR 分析表明，GRSP 中富含芳香族 C（30%）和羧基 C（40%），SOC 中富含烷基 C（30%）和 O-烷基 C（50%）。GRSP 的难降解指数（RI）定义为烷基 C 和芳香族 C 的总和与 O-烷基 C 和羧基 C 的总和之比，在 PF、MF 和 BF 中分别为（98.6±18.9）%、（145.5±10.9）%和（20.7±0.3）%，均高于 SOC。本研究表明，GRSP 结构的顽固性可能调节了热带森林中 SOC 固存的抵抗力，特别是在人工林和次生林中。
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