The Key Laboratory of Forest Plant Ecology, Northeast Forestry University, Harbin, China; Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.
The Key Laboratory of Forest Plant Ecology, Northeast Forestry University, Harbin, China; Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.
Sci Total Environ. 2017 Mar 1;581-582:657-665. doi: 10.1016/j.scitotenv.2016.12.176. Epub 2017 Jan 4.
Soil aggregation, an ecosystem function correlated with the concentration of glomalin-related soil protein (GRSP), is highly disturbed in saline soil. However, few studies have focused on differences in amount, composition, and ion binding capacity of GRSP in typical sodic-saline soils. In this study, a field study was performed in Songnen Plain. Combined indicators of soil salinity (Q value) were significant negatively correlated with GRSP concentration by Principal Component Analysis. Multiple linear regression models showed that soil salinity might account for 46%, 25% and 44% variation in total GRSP (T-GRSP), easily-extractable GRSP (EE-GRSP) and difficultly-extractable GRSP (DE-GRSP), respectively. Soil bulk density had most important impact on GRSP concentration, followed by the pH, soil EC had the weak influence. Comparative analysis was carried out between low-salinity and high-salinity soil. Purified T-GRSP of high-saline soil contained higher N content (13.13%), lower C content (43.41%) and lower functional groups relative content (e.g. CO and SiOSi). Purified T-GRSP of high-salinity soil had a greater binding capacity with calcium and phosphorus, the binding capacity could compensate the GRSP loss about 29.8% and 14.1%, respectively. Our findings suggested that sodic salinization of the soil led to a decrease in GRSP concentration and a change in the component percentages. This change in composition might be related to adaptation of fungi-plant systems to varied environments. The calcium and phosphorus binding capacity had a positive dependent of soil salinization, which was possible to develop ecological management or recovery technology in the future.
土壤团聚体是与菌根相关土壤蛋白（GRSP）浓度相关的生态系统功能，在盐渍土中受到高度干扰。然而，很少有研究关注典型苏打盐渍土中 GRSP 的数量、组成和离子结合能力的差异。本研究在松嫩平原进行了田间试验。主成分分析表明，土壤盐度（Q 值）与 GRSP 浓度呈显著负相关。多元线性回归模型表明，土壤盐度可能分别占总 GRSP（T-GRSP）、易提取 GRSP（EE-GRSP）和难提取 GRSP（DE-GRSP）变异的 46%、25%和 44%。土壤容重对 GRSP 浓度的影响最大，其次是 pH 值，土壤电导率的影响较弱。对低盐和高盐土壤进行了比较分析。高盐土壤中纯化的 T-GRSP 含有更高的 N 含量（13.13%）、更低的 C 含量（43.41%）和更低的功能基团相对含量（如 CO 和 SiOSi）。高盐土壤中纯化的 T-GRSP 与钙和磷的结合能力更强，结合能力分别可补偿 GRSP 损失约 29.8%和 14.1%。研究结果表明，土壤的苏打盐化导致 GRSP 浓度降低和组成百分比变化。这种组成变化可能与真菌-植物系统对不同环境的适应有关。钙和磷的结合能力与土壤盐度呈正相关，这可能为未来开发生态管理或恢复技术提供可能。
