Université Paris-Saclay, INRAE, AgroParisTech, UMR Ecosys, 91120, Palaiseau, France.
Université Paris-Saclay, INRAE, AgroParisTech, UMR MIA 518, 91120, Palaiseau, France.
Sci Rep. 2022 Aug 10;12(1):13616. doi: 10.1038/s41598-022-17855-z.
Earthworms play a key role in soil carbon mineralization, but their effect is highly uncertain and suspected to vary as a function of several factors, particularly the earthworm density and time from earthworm inoculation. We conducted a meta-analysis considering these factors based on 42 experiments comparing carbon mineralization in the absence and presence of earthworms at different times. The results reveal an average carbon mineralization increase of 24% (sd 41%) in the presence of earthworms with an initial median earthworm density of 1.95 mg/g soil DM (Dry Mass) (sd 48%). We show that carbon mineralization due to earthworms was related to their density and time from inoculation. From a simple regression model using these two variables, the estimated impact of earthworms on carbon mineralization was 20% increase from 0 to 60 days and 14% decrease at day 350 for a density of worms commonly found in soils (0.5 mg/g soil DM). Finally, we proposed a simple equation that could be used in organic matter decomposition models that do not take macrofauna into account.
蚯蚓在土壤碳矿化中起着关键作用，但它们的作用高度不确定，据推测会随几个因素而变化，特别是蚯蚓密度和蚯蚓接种后的时间。我们基于 42 个比较有无蚯蚓存在时土壤碳矿化的实验进行了荟萃分析，考虑了这些因素。结果表明，在初始蚯蚓密度中位数为 1.95mg/g 土壤干重（sd 48%）的情况下，蚯蚓存在时土壤碳矿化平均增加了 24%（sd 41%）。我们表明，蚯蚓引起的碳矿化与它们的密度和接种后的时间有关。根据使用这两个变量的简单回归模型，估计蚯蚓对碳矿化的影响是在 0 到 60 天内增加 20%，在 350 天时减少 14%，对于土壤中常见的蚯蚓密度（0.5mg/g 土壤干重）。最后，我们提出了一个简单的方程，可以用于不考虑大型动物的有机质分解模型。
