Slow recovery of soil biodiversity in sandy loam soils of Georgia after 25 years of no-tillage management
Slow recovery of soil biodiversity in sandy loam soils of Georgia after 25 years of no-tillage management
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DOI：
10.1016/j.agee.2005.11.019
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发表时间：
2006-06-01
影响因子：
6.6
通讯作者：
Read, F
中科院分区：
文献类型：
--
作者：
Adl, SM;Coleman, DC;Read, F
关于土壤物种丰富度从诸如耕作等干扰中恢复所需时间的数据很少。我们确定了在研究开始时代表4-25年干扰减少的商业免耕田。将这些作为常规耕作的邻近田作为常规扰动参考点进行比较。在佐治亚州南部的五个棉田沙地壤土取样四次，在2年内确定在每个地点的土壤生物丰度。我们的研究结果表明，在免耕管理下，随着年龄的增长，样品内的有机质含量、剖面分层和形态多样性增加。一些生物群体对免耕管理的反应更快，而大多数生物的多样性在几年内增加。然而，每个分类类别的丰度值并不总是显著的。我们还确定了春季和秋季样品中微生物生物量、有机碳含量和某些类别生物之间的模式。在免耕前8年，生物丰度有一定的增加，但只有两个老田（8-26年）积累的丰度和物种丰富度接近未耕地。我们的研究结果表明，与分类类别的丰度估计相比，样品中的物种多样性估计更为重要。我们建议在农业生态系统中进行足够长的土壤管理研究，以便有足够的时间发生地下群落结构及其物种多样性的变化。(c) 2005 Elsevier B.V.版权所有
There is little data on the time required for recovery of soil species richness from disturbance such as tillage. We identified commercial no-till fields that represented a chronosequence of 4-25 years of reduced disturbance at the start of the study. These were compared to adjacent fields in conventional tillage as regularly disturbed reference sites. Five cotton fields in southern Georgia sandy loam soils were sampled four times over 2 years to determine the abundance of soil organisms at each site. Our results show an increase in organic matter content, profile stratification, and diversity of morphotypes within samples, with age in no-tillage management. Some groups of organisms responded more quickly to the no-till management, while most increase in diversity over several years. However, abundance values for each taxonomic category was not always significant. We also identified a pattern between our Spring and Fall samples for microbial biomass, organic carbon content and certain categories of organisms. During the first 8 years of no-tillage there was some increase in the abundance of organisms, but only the two older fields (8-26 years) had accumulated both abundance and species richness that approached that of undisturbed sites. Our results point to a greater importance of species diversity estimates in samples, compared to abundance estimates for taxonomic categories. We recommend that soil management studies in agro-ecosystems be conducted long enough to allow time for the changes in the below-ground community structure and its species diversity to occur. (c) 2005 Elsevier B.V. All rights reserved.