Impact of ecologically different earthworm species on soil water characteristics
Impact of ecologically different earthworm species on soil water characteristics
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DOI：
10.1016/j.ejsobi.2009.01.001
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发表时间：
2009-05-01
影响因子：
4.2
通讯作者：
Emmerling, Christoph
中科院分区：
文献类型：
--
作者：
Ernst, Gregor;Felten, Daniel;Emmerling, Christoph
通过室内试验，研究了不同生态类型植物对土壤水分特征的影响，如土壤张力、含水量和水分入渗速率。将三种蚯蚓（红蚯蚓、Aporrectodea caliginosa、蚯蚓）置于土柱（直径30 cm，高50 cm）中100天，每柱总新鲜蚯蚓生物量为22.7 +/- 0.4 g，各重复两次。每个柱在10和40 cm处配备有张力计，在10 cm深处配备有FD探针，以连续测量土壤张力和土壤水分的时间发展。此外，将30 g过筛并重新过筛的马粪置于土壤表面作为食物来源。在第28天和第64天模拟降水事件（10 mm）。在试验结束时，测定了水分入渗速率和55 cm深处的径流量。结果表明，相当多的证据表明，生态不同的蚯蚓以不同的方式改变土壤水分特性。对外来的L terrestris和内生的A. caliginosa表现出促进表土和底土干燥的趋势。它们密集而深入的挖洞活动，可能由于土壤较好的通气性而促进了水汽交换。与此相反，地上生的L rubellus倾向于提高土壤水分的存储在表土，这可能与较低的速率从土壤表面的凋落物流失，从而保持较厚的凋落物层。A. caliginosa导致相当高的水渗透率和更快的水排放在底土中，相对于其他物种，可能是由于高的土壤栖息活动。(C)2009年Elsevier Masson SAS。All rights reserved.
A laboratory experiment was performed to assess the impact of ecologically different earthworm species on soil water characteristics, such as soil tension, water content, and water infiltration rate. Three earthworm species (Lumbricus rubellus, Aporrectodea caliginosa, Lumbricus terrestris) were exposed in soil columns (diameter 30cm, height 50cm) for 100 days with a total fresh earthworm biomass of 22.7 +/- 0.4 g per column, each in duplicate. Each column was equipped with tensiometers at 10 and 40 cm and FD-probes at 10 cm depth, to continuously measure the temporal development of soil tension and soil moisture. Additionally, 30 g of sieved and revvetted horse manure was placed on the soil surface as a food source. Precipitation events (10 mm) were Simulated at day 28 and day 64. At the end of the experiment the water infiltration rate and the runoff at 55 cm depth were determined. The results showed considerable evidence, that ecologically different earthworms modify soil water characteristics in different ways. The anecic L terrestris and the endogeic A. caliginosa showed the tendency to enhance the drying of the topsoil and subsoil. Their intensive and deep burrowing activity might enhance the exchange of water vapor due to a better aeration in soil. In contrast, the epigeic L rubellus tended to enhance the storage of soil moisture in the topsoil, which might be linked to lower rates of litter loss from soil surface and thus a thicker litter layer remaining. A. caliginosa led to considerable higher water infiltration rates and faster water discharges in the subsoil, relative to the other species, probably due to a high soil dwelling activity. (C) 2009 Elsevier Masson SAS. All rights reserved.