The spatiotemporal contribution of the phytoplankton community and environmental variables to the carbon sequestration potential in an urban river
The spatiotemporal contribution of the phytoplankton community and environmental variables to the carbon sequestration potential in an urban river
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浮游植物群落和环境变量对城市河流固碳潜力的时空贡献
DOI：
10.1007/s11356-019-07109-3
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发表时间：
2019-12
影响因子：
5.8
通讯作者：
Feng Jia
中科院分区：
文献类型：
--
作者：
Yang Jing;Wang Fei;Lv Junping;Liu Qi;Nan Fangru;Liu Xudong;Xu Lan;Xie Shulian;Feng Jia
浮游植物(内部驱动力)和影响复杂生化反应的环境变量(外部驱动力)在调节光合作用固碳中起着重要作用。核酮糖-1，5-二磷酸羧基/加氧酶(Rubisco)广泛存在于各种浮游植物中，是光合作用过程中的重要酶。为了研究浮游植物的组成(内部驱动力)，我们选择Rubisco大亚基(RbcL)的功能基因作为本研究的目标基因。使用光和暗生物需氧量瓶测量浮游植物总初级生产力，以评估碳固定潜力。确定了基本的环境指标，以分析驱动固碳过程的机理。相关分析结果表明，绿藻只受硝酸盐的控制，硅藻与磷酸盐呈正相关。聚类分析结果表明，亚硝酸盐是控制浮游植物初级生产力的主要驱动因素。在雨季(春季和夏季)，浮游生物群落呼吸对固碳潜力的贡献大于净初级生产力，其次是溶解有机碳和硝酸盐。在旱季(秋季)，净初级生产力、总氮和亚硝酸盐的固碳潜力最高。绿藻和硅藻对固碳潜力的贡献在时间上高于蓝藻。由于硅藻的产生和磷酸盐的作用，固碳潜力最大值出现在秋季，而固碳潜力最小值出现在夏季。在空间上，由于蓝藻(Phormidium)、硅藻(Surirella solea和Thalassiosira pustonana)和环境变量(亚硝酸盐)的影响(贡献)，上游的固碳潜力高于下游。这些发现有助于更好地理解浮游植物生产力的潜在机制，以及环境变量对城市河流生态系统碳固定的影响。
The phytoplankton (internal driving forces) and environmental variables that affect complex biochemical reactions (external driving forces) play an important role in regulating photosynthetic carbon fixation. Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) exists in various phytoplankton species and is an important enzyme in the photosynthetic process. To investigate the phytoplankton composition (internal driving forces), we selected the functional gene of the Rubisco large subunit (rbcL) as the target gene for this study. Phytoplankton gross primary productivity was measured using light and dark biological oxygen demand bottles to assess the carbon sequestration potential. The fundamental environmental indicators were determined to analyze the mechanisms that drive the carbon fixation process. The correlation results indicated that green algae were only controlled by nitrate, and that diatoms were positively correlated with phosphate. The cluster analysis results demonstrated that nitrite was the major driver controlling phytoplankton primary productivity. During the wet seasons (spring and summer), the contribution of the planktonic community respiration to the carbon sequestration potential was higher than net primary productivity (NPP), followed by dissolved organic carbon and nitrate. During the dry season (autumn), NPP, total nitrogen, and nitrite ranked highest in terms of carbon sequestration potential. The contributions of green algae and diatoms to the carbon sequestration potential were temporally higher than those of cyanobacteria. The maximum carbon sequestration potential occurred during autumn because of diatom production and the function of phosphate, whereas the minimum carbon sequestration potential occurred in summer. Spatially, the upstream carbon sequestration potential was higher compared with downstream because of the effect (contribution) of cyanobacteria (Phormidium), diatoms (Surirella soleaandThalassiosira pseudonana), and environmental variable (nitrite). These findings provide a better understanding of the underlying mechanisms of phytoplankton productivity and the influences of environmental variables on carbon sequestration in urban river ecosystems.
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