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作 者 ：宋琰,肖能文,戈峰

期 刊 ：生态学报 2007年 27卷 7期 页码：2922~2928

关键词：蚯蚓；土壤生态；CO2浓度；

Keywords:earthworm, soil ecology, CO2, C, N,

摘 要 ：以加倍CO₂浓度(750μmol/mol)处理和正常CO₂浓度(370μmol/mol)生长下的棉花凋落叶为试验材料，以威廉腔蚓Metaphire guillemi (Michaelsen, 1895)和不同的CO₂浓度(750μmol/mol和370μmol/mol)为作用因子，分析了蚯蚓、CO₂浓度通过叶片分解对土壤C、N含量的影响。结果表明:接种蚯蚓和加入凋落叶的联合作用对有机C有显著提高作用。接种蚯蚓对土壤全N含量影响不显著，但 CO₂浓度升高和蚯蚓联合作用对土壤全N含量有显著影响。CO₂、叶片、蚯蚓3因子联合作用对土壤C、N含量有显著提高作用，且与蚯蚓和叶片联合作用对土壤C、N含量的影响相比，其效果更显著。结果显示，CO₂浓度的升高通过改变植物凋落物C含量及其营养成分，影响了其潜在的降解有效性，同时大气CO₂浓度的升高影 响凋落物在蚯蚓体内降解过程，从而对凋落物的有效降解产生显著影响，最终改变土壤C、N含量。

Abstract:The influence of earthworm and elevated CO₂ on cotton leaf decomposition and C and N transformation in the soil by the 56 days experiment treated with earthworm under different levels of CO₂ were analyzed. The effect of different levels of CO₂, cotton leaf and their interactions on C content in soil was not significant, while interaction of earthworm and cotton leaf was significant. Earthworm didn′t influence the N content solely, but the combined effect of elevated CO₂ and earthworm could influence the N content. The interaction of CO₂, earthworm and leaf was more significant than that of earthworm and leaf. Our results indicated that the elevated CO₂ made the component of litter decomposition easier and improved the ability of decomposition and transformation of litter through earthworm, resulted in the change of C and N content in soil.

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