Martin Agnès, Balesdent Jérôme, Mariotti André
Laboratoire d'Ecologie (CNRS UA 258), Ecole Normale Supérieure, 46 rue d'Ulm, F-75230, Paris Cedex 05, France.
Laboratoire de Biogéochimie Isotopique (CNRS UA 196-INRA), Université Paris VI, 4 Place Jussieu, F-75252, Paris Cedex 05, France.
Oecologia. 1992 Aug;91(1):23-29. doi: 10.1007/BF00317236.
The ability of earthworms to assimilate soil organic pools of different ages was investigated in field conditions through natural C labelling. Provided that C natural abundance of earthworm tissues is determined by their diet, the assimilation of soil organic matter by earthworms was estimated by measuring C/C ratio of tissues of earthworms sampled in soils containing organic pools with differing C/C ratios. Earthworms were collected in two locations where the vegetation shifted from a C3 to a C4 type (France), or from a C4 to a C3 type (Ivory Coast) 3 to 20 years ago. The results show that irrespective of their ecology (litter or soil-feeding), earthworms mainly feed on recent soil organic pools and assimilate soil organic matter with the same age distribution as the overall decomposers in the soil.
通过天然碳标记在田间条件下研究了蚯蚓同化不同年代土壤有机库的能力。鉴于蚯蚓组织的碳自然丰度由其饮食决定，通过测量在含有不同碳/碳比有机库的土壤中采样的蚯蚓组织的碳/碳比，估算蚯蚓对土壤有机质的同化作用。在两个地点采集蚯蚓，其中一处植被在3至20年前从C3型转变为C4型（法国），另一处从C4型转变为C3型（象牙海岸）。结果表明，无论其生态习性（取食凋落物或土壤）如何，蚯蚓主要取食近期的土壤有机库，并同化与土壤中整体分解者具有相同年龄分布的土壤有机质。
