Experimental evidence for the role of earthworms in compacted soil regeneration based on field observations and results from a semi-field experiment
Experimental evidence for the role of earthworms in compacted soil regeneration based on field observations and results from a semi-field experiment
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DOI：
10.1016/j.soilbio.2009.01.006
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发表时间：
2009-04-01
影响因子：
9.7
通讯作者：
Boizard, Hubert
中科院分区：
文献类型：
--
作者：
Capowiez, Yvan;Cadoux, Stephane;Boizard, Hubert
在实验室实验中，经常观察到蚯蚓在压实的土壤层中挖洞，导致人们普遍假设这些动物在农业地块中再生压实土壤方面发挥着重要作用。为了证明这一作用，在现场条件下，丰富的压实区内的土壤大孔隙估计在减少（RT）或传统耕作（CT）的地块。然后，在木箱中实验模拟CT（犁盘和压实土块）和RT地块（车辙下的压实体积）中典型发现的不同类型的压实区，埋在田间并接种不同的蚯蚓物种。培养6周后，检查压实区内的大孔数量。现场观察表明，约10%和30%的压实区的殖民地至少有一个大孔在CT和RT图，分别。一个显着更多的anecics被发现在RT地块，但我们不能得出结论，这种生态类型的植物在这些地块的再生过程中起着更重要的作用，因为有较少的压实区，这些覆盖面积较小的CT。半田实验提供的证据表明，蚯蚓介导的压实区的再生是可能的，其性质不同的生态类型的土壤。蚯蚓是穿越犁盘的主要物种，它的个体洞穴是垂直和深的。另外3种（Aporrectodea giardi，A. caliginoso和A. rosea）确实在其他类型的压实区（“车轮痕迹”和“压实土块”）内打洞。然而，在每一种情况下，大孔密度远大于非压实区，说明避免压实土壤的蚯蚓是很重要的，应该考虑到从实验室研究结果外推时。(C)2009爱思唯尔有限公司保留所有权利。
In laboratory experiments, earthworms are often observed to burrow through compacted soil layers, leading to the general assumption that these animals play a significant role in regenerating compacted soils in agricultural plots. To demonstrate this role under field conditions, the abundance of earthworm macropores inside compacted zones was estimated on plots under reduced (RT) or conventional tillage (CT). Then, different types of compacted zones typically found in CT (plough pan and compacted clods) and RT plots (compacted volume under wheel tracks) were experimentally simulated in wooden boxes, buried in the field and inoculated with different earthworm species. After 6 weeks of incubation, the number of macropores inside the compacted zones was examined. Field observations showed that approximately 10% and 30% of the compacted zones were colonised by at least one macropore in CT and RT plots, respectively. A significantly greater number of anecics was found in RT plots, but we could not conclude that this ecological type of earthworm plays a more major role in the regeneration process in these plots since there were fewer compacted zones and these covered a smaller area in CT. The semifield experiment provided evidence that earthworm-mediated regeneration of compacted zones is possible and its nature varies between ecological types of earthworm. Lumbricus terrestris, which makes individual burrows that are vertical and deep, was the main species to cross through the plough pan. The other three earthworm species (Aporrectodea giardi, A. caliginoso and A. rosea) did burrow inside the other types of compacted zones ("wheel tracks" and "compacted clods"). In every case, however, macropore density was far greater in non-compacted zones, illustrating that avoidance of compacted soil by earthworms is important and should be taken into account when extrapolating results from laboratory studies. (C) 2009 Elsevier Ltd. All rights reserved.