【摘要】 稳定δ¹³C和δ¹⁵N是研究生态系统中物质循环与能量流动的有效技术。δ¹³C值常用来分析消费者食物来源,δ¹⁵N值常用来确定生物在食物网中的营养位置。本文利用稳定δ¹³C和δ¹⁵N对贵州省施秉下洞和木老唐洞进行营养级关系的研究,结果表明:施秉下洞和木老唐洞动物类群对δ¹³C和δ¹⁵N的富集都较明显,两洞对δ¹³C富集跨度分别为4.911 4‰和6.292 8‰,对δ¹⁵N的富集跨度分别为6.687 0‰和5.056 0‰;但从总体来看,两生态系统中对δ¹³C的富集程度不稳定,而对δ¹⁵N的富集程度较稳定,故通过利用δ¹⁵N值来评价营养级层次,得出两洞对δ¹⁵N的富集因子分别为2.808 0和2.420 0,其营养级层次均为三级:土壤有机质作为第一营养级,另外以土壤有机质为食的马陆类群和螺类、裸灶螽等处于第二营养级,蜘蛛类群、红点齿蟾和蝙蝠类群等处于第三营养级。更多还原

【Abstract】 Stable δ¹³C and δ¹⁵N is a very effective technology used to research material circulation and energy flow in ecosystem.The δ¹³C value is commonly used for the analysis of consumer food source.Theδ¹⁵N value is commonly used to determine the living creature position in the food web.Stable δ¹³C andδ¹⁵N are used to to research the trophic level relationship of Guizhou Shibingxia cave and Mulaotang cave.The result showed that fauna enrichment on the δ¹³C and δ¹⁵N enrichment were obvious in Shibingxia cave and Mulaotang cave.Two caves enrichment spans on the δ¹³C（the difference between the maximum and minimum values） were 4.911 4‰ and 6.292 8 ‰ respectively and on the δ¹⁵N were 6.687 0‰ and5.056 0‰.But on the whole,the two ecosystems enrichment on δ¹⁵N is much stable than on δ¹³C.So it is concluded that the two caves enrichment factors on the δ¹⁵N value are 2.808 0 and 2.420 0 respectively by using the level δ¹⁵N value to evaluate the level of nutrition.The trophic levels have three levels.They are as follows.The first trophic level is soil organic matter.The second trophic level is Kronopolites sp.,Gastroptychia sp.and Distrammena sp.which feed on soil organic matter.The third trophic level is Oreolalax rhodostigmatus,spiders and bats taxa.更多还原