Regulation of soil structure by geophagous earthworm activities in humid savannas of Cote d'Ivoire
Regulation of soil structure by geophagous earthworm activities in humid savannas of Cote d'Ivoire
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DOI：
10.1016/s0038-0717(96)00042-9
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发表时间：
1997-03-01
影响因子：
9.7
通讯作者：
Valentin, C
中科院分区：
文献类型：
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作者：
Blanchart, E;Lavelle, P;Valentin, C
通过为期 28 个月的田间实验，研究了内生蚯蚓在维持非洲稀树草原土壤结构中的作用。分析了原状土块中骨料尺寸分布、孔隙率和骨料稳定性的变化，其中蚯蚓已被去除，然后进行四种处理：（1）自然稀树草原动物群的重新定植（对照，12次重复），（2）引入大型蚯蚓Millsonia anomala种群（13次重复），（3）引入小型丝状eudrilid地球规范种群（13）重复），（4）没有蚯蚓重新定殖（12 个重复）。实验结束时，四种处理之间观察到显着差异。 M. anomala 负责形成大于 5.0 毫米的大聚集体，而 eudrilid 蚯蚓则排出较小的聚集体（0.5-5 毫米）。结果表明，这两种蠕虫的存在对于维持自然土壤结构是必要的。如果一种或两种蠕虫被排除在土壤之外，初始结构就会受到很大影响。 (C) 1997 爱思唯尔科学有限公司。
The role of endogeic earthworms in the maintenance of the structure of an African savanna soil has been investigated in a 28-month field experiment. Changes of aggregate size distribution, porosity and aggregate stability were analysed in undisturbed soil monoliths from which earthworms had been removed and which had then been submitted to four treatments: (1) recolonization by natural savanna fauna (control, 12 replicates), (2) introduction of a population of Millsonia anomala, a large earthworm (13 replicates), (3) introduction of a population of small filiform eudrilid earth Norms (13 replicates), and (4) no recolonization by earthworms (12 replicates). At the end of the experiment, significant differences were observed among the four treatments. M. anomala was responsible for the formation of macroaggregates > 5.0 mm whereas eudrilid earthworms egested smaller aggregates (0.5-5 mm). The results suggest that the presence of both types of worms is necessary to maintain the natural soil structure. If one or both types of worm are excluded from the soil, the initial structure is greatly affected. (C) 1997 Elsevier Science Ltd.