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作 者 ：庞军柱,乔玉辉*,孙振钧,李云乐

期 刊 ：生态学报 2009年 29卷 2期 页码：1017~1023

关键词：蚯蚓；麦秸；分解速率；氮矿化；

Keywords:organic matter, decomposition rate mineralization,

摘 要 ：蚯蚓在有机物分解和土壤的碳氮循环中起着重要作用。研究采用室内微宇宙模拟试验，研究接种不同密度的蚯蚓对秸秆分解和土壤氮素矿化的贡献。设置3个处理，HDT为接种6条蚯蚓，LDT为接种2条（相当于田间蚯蚓密度水平），ZDT为不接种作为对照。结果表明：整个分解过程中，蚯蚓的引入加速了秸秆的分解，尤其在分解前期，处理ZDT与HDT、LDT处理之间无论是分解率还是分解速率差异显著（P < 0.05），随着蚯蚓密度的增加，蚯蚓在分解过程中的作用比例增大。秸秆分解的整个过程中，蚯蚓对氮的矿化速率，HDT、LDT两个处理都递减，并且到后期两个处理趋于一致（HDT处理为24.2~14.0 kg·hm-2·a-1，LDT处理为20.3~10.7 kg·hm-2·a-1），说明从长期来看，在田间蚯蚓密度水平上增大蚯蚓的密度并不能增大基于地下食物网的蚯蚓对氮的矿化速率。

Abstract:Earthworms, the most important macro-fauna in terrestrial ecosystem play an important role in organic matter decomposition and nutrient cycling. The influence of the earthworm (Eisenia foetida) on these processes was evaluated under a laboratory experiment in which wheat straw has been incorporated into soil under three different treatments (incubated with earthworms at zero (ZDT)，low (LDT, as earthworm density of arable land in Quzhou experimental station, Hebei Province) and high density (HDT, three times higher than LDT). Each treatment was regularly destructively sampled to determine decomposition rates of residue and changes of nitrogen. The results showed that decomposition rates were accelerated by the increasing of Eisenia foetida density. Compared to ZDT, earthworm significantly increased the decomposition rates (P<0.05) during the prophase of the experiment (days 0-14). During the decomposition process, the nitrogen mineralization rate was slowed down in the HDT and LDT treatments, and was almost similar in the anaphase of the decomposition process（HDT:24.2-14.0 kg·hm-2·a-1，LDT:20.3-10.7. kg·hm-2·a-1）, so in the long run, the increase of earthworm density at farmland level would not increase the nitrogen mineralization rate.

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