• 方法与技术 •

应用碳氮稳定同位素研究贵州织金洞动物食物来源与营养级

1. （贵州师范大学生命科学学院， 贵阳 550001）
• 出版日期:2017-05-10 发布日期:2017-05-10

Food sources and trophic level of animals in Guizhou Zhijin cave by means of stable carbon and nitrogen isotopes.

ZHAO Lu, XU Cheng-xiang*, LI Dao-hong, YAN Han-lin

1. (School of Life Sciences, Guizhou Normal University, Guiyang 550001, China).
• Online:2017-05-10 Published:2017-05-10

Abstract: Carbon and nitrogen stable isotope ratios were used to analyze animals’ trophic level and the contribution rates of organic carbon source in light zone of Zhijin cave, Guizhou. The results showed that the δ13C of plants ranged from (-43.46±0.06)‰ to (-37.54±0.03)‰, and δ15N ranged from (0.71±0.01)‰ to (2.38±0.00)‰. The mean of δ13C of soil organic matter (SOM) was （-24.99±0.01）‰, which showed that the contribution of the plants to SOM was small. δ15N of SOM in the light zone was (3.93±0.03)‰, being lower than that of SOM out the cave. The contribution of 6 kinds of organic carbon source to the food sources of cave animals was calculated using IsoSource, and the results showed that the mean rate of contribution of soil organic matter to cave animals (except for the food sources of Tipula sp. and Sypna sp.) was more than 60%, being higher than those from the plants, indicating that soil organic matter was the main food source of cave ecosystem. According to the calculation formula of trophic level, the ecosystem was composed of 3 trophic levels. Soil organic matter was the first trophic level, followed by Diestrammena sp., Pocellio scaber, Camberlinius sp., Bradybaena strictotaenia, Phalangiidae sp., Hahnia sp. Drosophila sp., Uenotrechus sp. and most of spider groups were the third trophic level.