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首页> 美国卫生研究院文献>Bioengineered >Long-term cover cropping seasonally affects soil microbial carbon metabolism in an apple orchard
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Long-term cover cropping seasonally affects soil microbial carbon metabolism in an apple orchard

机译：长期覆盖农作物季节性影响苹果园土壤微生物碳代谢

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摘要

Groundcover management can significantly affect soil microbial metabolic activities, especially carbon metabolism, in apple orchards. However, there have been few studies on the effects of groundcover on the seasonality of soil microbial carbon metabolism. We, therefore, studied soil microbial carbon metabolism in an apple orchard on China’s Loess Plateau under four single species cover crops (the grass L., and the legumes L., L.) during spring, summer and fall. Cover cropping significantly, but differentially, promoted soil microbial carbon metabolism in spring and fall. However, cover cropping leads to a significant reduction of soil moisture in spring and summer due to the competition of soil moisture between the cover crops and apple trees, which probably lead to the changes in types of carbon substances metabolizing by soil microbes in summer. Besides, cover crop significantly enhanced soil organic carbon contents between three seasons while clean cultivation had slight, non-significant effects. The promotion of soil microbial metabolic activities was probably an important mechanism for the carbon accumulation, and we postulate that leguminous cover plants may have significantly different effects, mediated through their root exudates, from grasses on soil carbon contents.
机译：地被管理会严重影响苹果园中土壤微生物的代谢活动，尤其是碳代谢。然而，关于地被植物对土壤微生物碳代谢的季节性影响的研究很少。因此，我们研究了中国黄土高原苹果园春季，夏季和秋季四种单一物种的覆盖作物（草和豆科植物）的土壤微生物碳代谢。春季和秋季，覆盖作物明显但不同地促进了土壤微生物碳代谢。然而，由于覆盖作物与苹果树之间的土壤水分竞争，覆盖作物在春季和夏季导致土壤水分显着减少，这很可能导致夏季土壤微生物代谢的碳物质类型发生变化。此外，覆盖作物在三个季节之间显着提高了土壤有机碳含量，而清洁耕作对土壤有机碳含量的影响不明显。土壤微生物代谢活动的促进可能是碳积累的重要机制，我们推测豆科植物可能通过根系分泌物介导的草对土壤碳含量具有显着不同的影响。

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