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首页> 外文期刊>Applied Soil Ecology >Management of grasslands by mowing versus grazing - impacts on soil organic matter quality and microbial functioning
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Management of grasslands by mowing versus grazing - impacts on soil organic matter quality and microbial functioning

机译：通过割草对草地的管理，对土壤有机质质量和微生物功能的影响

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Although 30% of the European surface area is covered with grasslands, little is known about the effect of their management on soil quality and biogeochemical cycling. Here, we analysed soil from an experimental site in Western France, which had been under either grazing or mowing regime for 13 years. We aimed to assess the effect of the two management practices on the biogeochemical functioning of the soil system. To this end we compared soil organic matter (SOM) composition and microbial properties at two depths. We analysed for elemental, lignin and non-cellulosic polysaccharide content and composition, microbial biomass, soil microbial respiration and enzyme activities. Our results showed higher soil organic carbon (SOC) and nitrogen contents in the surface soil under grazing as compared to mowing. Soil biogeochemical properties also differed between grazing and mowing treatments. In particular, soil under grazing showed lower lignin and higher microbial biomass. Despite the similar non-cellulosic polysaccharide content under both treatments, microbial community under mowing was characterised by higher enzyme production per microbial biomass, leading to more degraded SOM in the mowing system as compared to grazing. We conclude that grazing and mowing regimes impact differently biogeochemical soil functioning. Higher and more diverse carbon input under grazing compared to mowing may lead to enhanced substrate availability and thus more efficient microbial functioning, which could favour SOC sequestration through formation of microbial products.
机译：虽然30％的欧洲表面积被草原覆盖，但对其管理对土壤质量和生物地球化学循环的影响几乎是众所周知的。在这里，我们分析了法国西部的实验部位的土壤，这是在放牧或割草制度下的13年。我们旨在评估两种管理实践对土壤系统生物地球化学功能的影响。为此，我们将土壤有机物质（SOM）组成和微生物特性进行了两种深度。我们分析了元素，木质素和非纤维素多糖含量和组成，微生物生物量，土壤微生物呼吸和酶活性。与割草相比，我们的结果表明，在放牧时，在饲养的地面土壤中的土壤有机碳（SoC）和氮含量较高。土壤生物地球化学特性也不同于放牧和割草处理。特别是，放牧下的土壤显示出降低木质素和更高的微生物生物量。尽管在两种治疗中存在类似的非纤维素多糖含量，但割草下的微生物群落的特征在于每微生物生物量的酶产生较高，导致割草系统中的索赔更加降解，与放牧相比。我们得出结论，放牧和割草制度会影响不同的生物地球化学土壤功能。与割草相比，放射下游的较高和更多样化的碳输入可能导致基底可用性增强，从而更有效的微生物功能，这可以通过形成微生物产品来赞美SOC封存。

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