论文部分内容阅读
通过气候培养箱在室内模拟不同光照强度及温度条件,测定海藻场瓦氏马尾藻碎屑(简称海藻碎屑)分解速率变化及海藻碎屑对海藻场海域无机营养盐贡献度,旨在为探究大型海藻碎屑的生态服务效能提供科学依据。结果表明:海藻碎屑剩余物质干重和分解速率受温度影响不显著(P>0.05),而光照强度影响显著(P<0.05);不同温度、光强条件下,海藻碎屑质量损失率在2个月的实验周期内皆大于60%,且温度25.15℃、光强3200 lx条件更有利于海藻碎屑分解;温度对海藻碎屑分解释放氮磷营养盐影响不显著(P>0.05);在同一温度(25.15℃)条件下,有无光照条件对水体铵态氮、硝态氮和亚硝态氮营养盐浓度变化影响不显著(P>0.05),但对正磷酸盐浓度影响显著(P<0.05);光照强度对水体内铵态氮和正磷酸盐浓度变化具有显著影响(P<0.05),对硝态氮和亚硝态氮浓度变化影响不显著(P>0.05);根据海藻场瓦氏马尾藻碎屑量估算出对现场海域水体溶解无机氮累积贡献量为4.597~17.321 mg·L~(-1),溶解无机磷累积贡献27.989~76.304 mg·L~(-1)。研究表明,不同温度条件下,瓦氏马尾藻碎屑分解释放铵态氮和正磷酸盐的量大于硝态氮和亚硝态氮,温度越高越利于铵态氮释放,而正磷酸盐则更利于在低温下分解释放;随光照强度的升高,氮磷营养盐释放趋势相反,正磷酸盐释放量随光照强度增大而受到抑制。
The changes of decomposition rates of Sargassum thunbergii Sargassum seaweed in the seaweed field and the contribution of seaweed detritus to the inorganic nutrients in the seaweed farm were studied by simulating different light intensity and temperature conditions in a climate incubator. Provide a scientific basis for the ecological service efficiency of large seaweed detritus. The results showed that the dry weight and decomposition rate of the residual materials of seaweed were not affected by temperature (P> 0.05), but the light intensity was significantly affected (P <0.05). Under different temperature and light intensity, The temperature was 25.15 ℃ and the light intensity was 3200 lx, which was more favorable for the decomposition of seaweed detritus. The temperature had no significant effect on the decomposition and release of nitrogen and phosphorus nutrients by seaweed (P> 0.05). Under the same temperature (25.15 ℃), there was no significant difference in the concentration of ammonium, nitrate and nitrite between the two treatments (P> 0.05), but had significant effect on the concentration of orthophosphate P <0.05). The light intensity had a significant effect on the changes of ammonium and orthophosphate (P <0.05), but had no significant effect on the changes of nitrate and nitrite (P> 0.05) The amount of debris of Sargassum clavulanius was estimated to be 4.597-17.321 mg · L -1 for dissolved inorganic nitrogen in water and 27.989-76.304 mg · L -1 for dissolved inorganic phosphorus. The results showed that under different temperatures, the amount of ammonium and orthophosphate released by the decomposition of Sargasso wartii was greater than that of nitrate and nitrite, and the higher the temperature, the better the release of ammonium nitrogen and the more orthophosphate Which is favorable for decomposition and release at low temperature. With the increase of light intensity, the release tendency of nitrogen and phosphorus nutrients is opposite, and the amount of orthophosphate released is restrained with the increase of light intensity.