College of Resources Science, Sichuan Agricultural University, Chengdu, 611130, China.
College of Forestry, Sichuan Agricultural University, Chengdu, 611130, China.
Environ Sci Pollut Res Int. 2019 Jan;26(2):1973-1982. doi: 10.1007/s11356-018-3782-4. Epub 2018 Nov 20.
Glomalin-related soil protein (GRSP) is crucial for the accumulation of soil organic carbon (SOC), and contributes to the formation of soil aggregates. However, it remains unclear whether GRSP is involved in altering the stability of soil aggregates in the long-term tea planting process. The relationship between the distribution of GRSP and soil aggregates in tea plantations is poorly studied. We compared the distribution of SOC and GRSP in aggregates in tea plantations of different ages (18, 25, 33, and 55 years) and those in an abandoned land and investigated their potential contribution to the soil aggregate stability. Tea plantation was found to be beneficial for the accumulation of SOC and GRSP compared to the abandoned land. The content of SOC significantly increased after tea plantation, especially in surface soil (0-20 cm), and the increase range was 21.79%-46.51%, due to the centralized management of tea plantations. The content of total glomalin-related soil protein (T-GRSP) and easily extractable glomalin-related soil protein (EE-GRSP) varied with the increasing tea plantation age. The T-GRSP content was higher in 25-year-old tea plantation, while EE-GRSP was gradually decreased with the increasing age of the tea plantation, and T-GRSP had better correlation with SOC than EE-GRSP. Long-term tea plantation (after 33 years) was not conducive to the preservation of GRSP. The distribution of GRSP in the tea plantation soils differed greatly among the aggregates, with the 0.25-1-mm aggregate having less GRSP, which might be related to the distribution of soil fungi in the aggregates. There was a significant correlation between T-GRSP and mean weight diameter (MWD; P < 0.05) in the whole soil, whereas EE-GRSP had no correlation with the MWD of the aggregates. The T-GRSP content was correlated closely with the stability of soil aggregates in the tea plantations, and their relationship was dependent on the aggregate scale. Our results show that the T-GRSP content in the tea plantation soils has important effects on the formation and stability of aggregates in this region, which was one of the factors affecting the structure and quality of tea plantation soil. Improving GRSP is an effective way for the both SOC sequestration and soil health after long-term tea plantation.
胶磷蛋白相关土壤蛋白（GRSP）对于土壤有机碳（SOC）的积累至关重要，并有助于土壤团聚体的形成。然而，目前尚不清楚 GRSP 是否参与了长期茶园种植过程中土壤团聚体稳定性的改变。GRSP 在茶园土壤团聚体中的分布与茶园土壤团聚体稳定性之间的关系研究甚少。我们比较了不同年龄（18、25、33 和 55 年）茶园和废弃土地中 SOC 和 GRSP 在团聚体中的分布，并研究了它们对土壤团聚体稳定性的潜在贡献。与废弃土地相比，茶园有利于 SOC 和 GRSP 的积累。茶园种植后，SOC 的含量显著增加，特别是在表层土壤（0-20cm），增加幅度为 21.79%-46.51%，这是由于茶园的集中管理。总胶磷蛋白相关土壤蛋白（T-GRSP）和易提取胶磷蛋白相关土壤蛋白（EE-GRSP）的含量随茶园种植年限的增加而变化。25 年生茶园的 T-GRSP 含量较高，而 EE-GRSP 则随着茶园种植年限的增加而逐渐减少，T-GRSP 与 SOC 的相关性优于 EE-GRSP。长期茶园（种植 33 年后）不利于 GRSP 的保存。GRSP 在茶园土壤团聚体中的分布差异很大，其中 0.25-1mm 团聚体中 GRSP 较少，这可能与土壤真菌在团聚体中的分布有关。T-GRSP 与整个土壤的平均重量直径（MWD；P<0.05）之间存在显著相关性，而 EE-GRSP 与团聚体的 MWD 之间没有相关性。T-GRSP 含量与茶园土壤团聚体的稳定性密切相关，其关系取决于团聚体的规模。研究结果表明，茶园土壤中的 T-GRSP 含量对该地区团聚体的形成和稳定性有重要影响，是影响茶园土壤结构和质量的因素之一。长期茶园种植后，提高 GRSP 是一种既能固定 SOC 又能保持土壤健康的有效方法。
