Location-dependency of earthworm response to reduced tillage on sandy soil
Location-dependency of earthworm response to reduced tillage on sandy soil
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DOI：
10.1016/j.still.2008.07.023
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发表时间：
2009
影响因子：
6.5
通讯作者：
M. Joschko;R. Gebbers;D. Barkusky;J. Rogasik;W. Höhn;W. Hierold;C. A. Fox;J. Timmer
中科院分区：
文献类型：
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作者：
M. Joschko;R. Gebbers;D. Barkusky;J. Rogasik;W. Höhn;W. Hierold;C. A. Fox;J. Timmer
由于蚯蚓在土壤中具有重要的功能，因此了解它们对耕作的敏感性对于可持续管理系统的设计非常重要。对生产者的沙土田进行了为期 10 年的观察研究，探讨了减少免耕耕作对蚯蚓丰度的影响。由于蚯蚓不仅受到耕作的影响，而且还受到土壤性质的影响，因此耕作效应的分析变得复杂。我们分析了德国勃兰登堡州东北部 74 公顷异质田地中蚯蚓（蚓科）的空间分布格局。通过沿着 42 个永久性地块上的 4 个样带进行手工分类来评估蚯蚓种群，这些地块部分采用常规耕作，部分采用减耕。计算每个样地不同的蚯蚓活动参数，并与0~15cm土壤质地、有机碳等土壤性质相关。此外，还对耕作系统之间分界线两侧的配对地块进行了分析。配对图的分析表明，质地较细的土壤比沙质土壤对减少耕作的反应更积极。状态空间分析证实，在所有情况下，土壤质地对于估计样线沿线的蚯蚓参数都很重要。 0 至 15 厘米的有机碳代表了耕作制度，是 2000 年蚯蚓最大丰度的一个特别重要的预测因子。我们的观察还表明，在少耕条件下，蚯蚓丰度的空间变异性更高，并且蚯蚓与土壤质地之间的关系更密切。为了在景观尺度研究中将土壤与管理效应分开，考虑土壤特性和土壤生物群空间变异性的方法是有前景的。
Since earthworms are of functional importance in soils, understanding their sensitivity to tillage is of importance for the design of sustainable management systems. The effect of reduced, ploughless tillage on earthworm abundance was explored during a 10-year observational study on a producer’s field on sandy soil. The analysis of tillage effects is complicated by the fact that earthworms are not only affected by tillage but also by soil properties. We analyzed the spatial distribution pattern of earthworms (Lumbricidae) in a heterogeneous 74ha field in Northeast Brandenburg, Germany. Earthworm populations were assessed by means of handsorting along 4 transects on 42 permanent plots which were partly under conventional, partly under reduced tillage. Different earthworm activity parameters were calculated for each plot and related to soil properties such as soil texture and organic carbon in 0 to 15cm. In addition, paired plots were analyzed at both sides of the dividing line between the tillage systems. The analysis of paired plots indicated that finer textured soils react more positively to tillage reduction than sandy soils. State-space analysis confirmed that soil texture was important in all cases for estimating earthworm parameters along the transects. Organic carbon in 0 to 15cm, indicative of the tillage system, was an especially important predictor for maximal abundances of earthworms in the year 2000. Our observations also suggest higher spatial variability of earthworm abundances and closer relationships between earthworms and soil texture under reduced tillage. For separating soil from management effects in landscape scale studies, approaches are promising which take into account the spatial variability of soil properties and soil biota.