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In order to clarify the effects of litter decomposition of Gracilaria lemaneiformis segments on environment and the succession of bacterial community, the characteristics of nutrient content in seaweed, water and sediment, and succession characteristics of bacterial community attached to the seaweed, water and sediment were carried out by the simulation experiment. The results showed that its decomposition rate reached 83.5% after 50 d. The content of total organic carbon (TOC), total nitrogen (TN) and total phosphorus (TP) in water increased by 241.2%, 229.8% and 101.3%, respectively, compared with the initial period. The content of dissolved oxygen (DO) in water decreased by 82.9%, which from 1.87 mg/L to 0.32 mg/L. In addition, the number of bacteria attached to G. lemanei-formis remained at 107 copy/g, while the richness and diversity of bacteria continued to increase during the decomposition processes. The bacteria community structure was significantly affected by total organic carbon, total nitrogen, total phosphorus and DO in water. The relative abundances of Planctomycetes, Spirochaetae, Firmicutes and δ-Proteobacteria increased, while that of Bacteroidetes, α-Proteobacteria and γ-Proteobacteria decreased. During the process of decomposition, the functional gene abundance of metabolism attached to G. lemaneiformis continued to decline. Briefly, the results indicated that decomposition of G. lemaneiformis segments would lead to the increasing of nutrient concentration in water. And Planctomycetes, Spirochaetae, Firmicutes and δ-Proteobacteria played important roles in the process of decomposing of G. lemaneiformis.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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