
Study on the effect of submerged plants on the stability of karst carbon sink
Caiyun SUN, Bingqing ZHENG, Jun LI, Hongming FU, Rongqing SUN, Honghao LIU, Zuying LIAO, Hongsheng JIANG, Zhenbin WU, Shibin XIA, Pei WANG
Study on the effect of submerged plants on the stability of karst carbon sink
Karst carbon sinks are an important means of achieving carbon neutrality, and their stability is a key scientific issue that needs to be addressed. Approximately 45% of annual photosynthesis on Earth occurs in aquatic environments, yet how submerged plants in karst areas affect the stability of karst carbon sinks remains unknown. This study focused on submerged plants in three karst rivers. We employed quadrat sampling, pH-drift technology, and elemental stoichiometry to qualitatively and quantitatively examine the effects of submerged plants on the stability of karst carbon sinks. Our results showed that there were 8, 5, and 7 species of submerged plants in the ZDR, CTR, and HXR, respectively. The Shannon-Wiener diversity index and Simpson dominance index ranked as ZDR>HXR>CTR. In the three karst rivers, Vallisneria natans, Ottelia acuminata, Potamogeton wrightii, and Hydrilla verticillata were the dominant species, all of which had the ability to utilize $\mathrm{HCO}_{3}^{-}$. The annual carbon sequestration rates of submerged plants in the ZDR, HXR, and CTR were 8.56×103 g·m-2·a-1, 4.83×103 g·m-2·a-1, and 3.88×103 g·m-2·a-1, respectively, with an average of 5.76×103 g·m-2·a-1, which are 37.65 and 40.56 times higher than those of grasslands and man-made forests, respectively. The higher the diversity of submerged plants in rivers, the higher the carbon sequestration. Overall, submerged plants play a crucial carbon pump role in karst aquatic ecosystems, thereby enhancing the stability of karst carbon sink.
karst carbon sink / carbon sequestration by submerged plants / plant diversity / dominant species of plants / river types
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