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首页> 美国卫生研究院文献>PLoS Clinical Trials >Differences in soil biological activity by terrain types at the sub-field scale in central Iowa US
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Differences in soil biological activity by terrain types at the sub-field scale in central Iowa US

机译：美国爱荷华州中部亚田尺度上不同地形类型的土壤生物活性的差异

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摘要

Soil microbial communities are structured by biogeochemical processes that occur at many different spatial scales, which makes soil sampling difficult. Because soil microbial communities are important in nutrient cycling and soil fertility, it is important to understand how microbial communities function within the heterogeneous soil landscape. In this study, a self-organizing map was used to determine whether landscape data can be used to characterize the distribution of microbial biomass and activity in order to provide an improved understanding of soil microbial community function. Points within a row crop field in south-central Iowa were clustered via a self-organizing map using six landscape properties into three separate landscape clusters. Twelve sampling locations per cluster were chosen for a total of 36 locations. After the soil samples were collected, the samples were then analysed for various metabolic indicators, such as nitrogen and carbon mineralization, extractable organic carbon, microbial biomass, etc. It was found that sampling locations located in the potholes and toe slope positions had significantly greater microbial biomass nitrogen and carbon, total carbon, total nitrogen and extractable organic carbon than the other two landscape position clusters, while locations located on the upslope did not differ significantly from the other landscape clusters. However, factors such as nitrate, ammonia, and nitrogen and carbon mineralization did not differ significantly across the landscape. Overall, this research demonstrates the effectiveness of a terrain-based clustering method for guiding soil sampling of microbial communities.
机译：土壤微生物群落由发生在许多不同空间尺度上的生物地球化学过程构成，这使土壤采样变得困难。由于土壤微生物群落在养分循环和土壤肥力中很重要，因此了解微生物群落在异质土壤景观中的功能很重要。在这项研究中，使用自组织图确定景观数据是否可用于表征微生物生物量和活性的分布，以便更好地了解土壤微生物群落功能。通过自组织地图，使用六个景观属性将爱荷华州中南部的行作物田地中的点聚集到三个单独的景观集群中。每个群集选择了十二个采样位置，总共选择了36个位置。收集土壤样品后，对样品进行各种代谢指标分析，例如氮和碳矿化，可提取的有机碳，微生物生物量等。发现位于坑洼处和脚趾坡度位置的采样位置明显更大。微生物生物量氮和碳，总碳，总氮和可提取的有机碳均高于其他两个景观群，而位于上坡的位置与其他景观群没有显着差异。但是，诸如硝酸盐，氨，氮和碳的矿化等因素在整个景观中并没有显着差异。总的来说，这项研究表明了一种基于地形的聚类方法对指导微生物群落土壤采样的有效性。

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