米草属植物的入侵是否影响红树林中多毛类的碳水化合物同化?以张江口红树林国家级自然保护区为例

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY Journal of Sea Research Pub Date : 2023-10-01 DOI:10.1016/j.seares.2023.102435
Feijie Wang , Xinjia Sun , Yue Zhao , Haolin Wang , Xiaoying Song , Shudong Wei , Hui Chen
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引用次数: 0

摘要

碳水化合物是米草属入侵红树林生态系统凋落物动态和底栖食物网的主要驱动力,在植物凋落物中形成了大量的碳库。然而,关于外来凋落叶碳水化合物对底栖动物碳同化的影响,目前还存在很大的知识空白。本研究分析比较了外来互花米草(SA)和本土红树甘露花(KO)凋落叶分解过程中纤维素、木质素和单糖(葡萄糖、甘露糖、半乳糖、木糖和阿拉伯糖)等碳水化合物的动态变化。同时,利用纤维素和木质素的δ13C值差异分析了米草属植物入侵后多毛类对凋落叶碳水化合物的利用。结果表明,外来SA凋落叶的分解速率低于KO凋落叶。SA凋落叶中纤维素、葡萄糖和半乳糖含量高于KO凋落叶(P <0.05)。KO凋落叶中纤维素和单糖(阿拉伯糖、木糖、甘露糖和半乳糖)的分解速率比SA凋落叶快(P <0.05)。然而,外来SA凋落叶与本地KO凋落叶的木质素分解速率无显著差异(P >0.05)。在原生KO样地,KO凋落叶碳水化合物的贡献率为55%(纤维素为26.91 ~ 28.02%;木质素(28.05-28.64%)是多毛动物的有机碳源。然而,在外来SA样地,外来SA凋落叶的碳水化合物贡献为>65%(纤维素,36.83-38.30%;木质素(28.47-30.52%)是多毛类的有机碳源。结果表明,米草属植物的入侵增加了多毛类对纤维素的同化。外来SA凋落叶碳水化合物中纤维素的高含量和低分解率可能是米草属入侵红树林生态系统底栖生物碳同化变化的重要机制。鉴于张江口红树林保护区存在米草属植物的定植,本研究为生态恢复后底栖动物的恢复提供了理论依据。此外,今后还应综合考虑不同生态系统不同底栖生物对碳水化合物的同化机制。
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Does Spartina invasion affect the carbohydrate assimilation of polychaetes in mangroves? A case study in the Zhangjiang Estuary Mangrove National Nature Reserve

Carbohydrates, which form a large pool of carbon in plant litter, are a major driver of litter dynamics and benthic food webs in Spartina-invaded mangrove ecosystems. However, there are large gaps in knowledge regarding the effects of exotic leaf litter carbohydrates on benthic carbon assimilation. In this study, the dynamics of carbohydrates, including cellulose, lignin and monosaccharides (glucose, mannose, galactose, xylose and arabinose), during the leaf litter decomposition of the exotic Spartina alterniflora (SA) and the native mangrove plant Kandelia obovata (KO) were analyzed and compared. Meanwhile, the differences in the δ13C values of cellulose and lignin were used to analyze the utilization of leaf litter carbohydrates by polychaetes after Spartina invasion. Our results showed that the decomposition rate of exotic SA leaf litter was lower than that of KO leaf litter. The contents of cellulose, glucose and galactose in SA leaf litter were higher than those in KO leaf litter (P < 0.05). The decomposition rates of cellulose and monosaccharides (arabinose, xylose, mannose and galactose) in KO leaf litter were faster than those in SA leaf litter (P < 0.05). However, there was no significant difference in the decomposition rates of lignin in the leaf litter between exotic SA leaf litter and native KO leaf litter (P > 0.05). In the native KO plot, the carbohydrates of KO leaf litter contributed to >55% (cellulose, 26.91–28.02%; lignin, 28.05–28.64%) of the organic carbon sources of polychaetes. However, in the exotic SA plot, the carbohydrates of exotic SA leaf litter contributed to >65% (cellulose, 36.83–38.30%; lignin, 28.47–30.52%) of the organic carbon sources of polychaetes. The obtained results suggested that Spartina invasion increased the assimilation of cellulose by polychaetes. The high content and low decomposition rate of cellulose in the carbohydrates of exotic SA leaf litter might be important mechanisms for the carbon assimilation changes in the benthos of Spartina-invaded mangrove ecosystems. Given that Spartina has colonized in the Zhangjiang Estuary Mangrove Reserve, this study provides a theoretical basis for the recovery of benthos after ecological restoration. Furthermore, the mechanisms of carbohydrate assimilation by different benthos of different ecosystems should be comprehensively considered in the future.

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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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