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首页> 外文期刊>Pedobiologia >Effects of organic inputs derived from pea and wheat root functional traits on soil protease activities
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Effects of organic inputs derived from pea and wheat root functional traits on soil protease activities

机译：豌豆和小麦根功能性状的有机投入对土壤蛋白酶活性的影响

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Legume-derived organic inputs such as crop residues or compounds derived from rhizodeposition can influence soil microbial activities implicated in the degradation of organic N. Crops succeeding legumes can also be important drivers of such microbial activities, and trait-based approaches can be employed to better understand the influence of plants on soil microbial activities. The objective of this study was to examine the effects of organic inputs (rhizodeposits and crop residues) of previously planted pea together with wheat root traits on soil protease activities. We measured soil protease activities, soil variables describing C and N availability and microbial biomass N and wheat root functional traits related to resource acquisition and rhizodeposition at 5 wheat developmental stages. Soil protease activities were significantly increased by the addition of pea crop residues, whereas previous pea cropping (i.e., soil containing organic inputs derived from pea rhizodeposition) did not influence these activities. The percentage of fine roots < 0.1mm in diameter was the only root trait that contributed to variation in soil protease activities. Other belowground traits related to plant nutrient competitive abilities (specific root length, root N uptake, root biomass, and hot water-extractable root N) did not influence soil protease activities. We showed that pea crop residues, acting as substrates, are the main drivers of soil protease activities. However, our results highlight the importance of considering fine roots to understand the effects of plants on soil microbial activities implicated in N mineralization.
机译：豆类衍生的有机输入如裁剪残基或衍生自甲基沉积的化合物可以影响有机N.农作物的降解的土壤微生物活性也可以是这种微生物活动的重要驱动因素，并且可以更好地使用基于特质的方法了解植物对土壤微生物活动的影响。本研究的目的是研究以前种植豌豆的有机投入（Rhizodeposits和作物残留物）的影响与土壤蛋白酶活动的小麦根系特征在一起。我们测量了土壤蛋白酶活性，土壤变量描述了与5个小麦发育阶段相关的C和N可用性和微生物生物量N和小麦根功能性质，其有关的资源采集和无状沉积。通过添加豌豆作物残留物，土壤蛋白酶的活性显着增加，而之前的豌豆种植（即，含有豌豆Rhizodeposition的土壤的土壤）不会影响这些活动。直径细根<0.1mm的百分比是唯一有助于土壤蛋白酶活性变异的根特征。与植物养分竞争能力相关的其他地下特征（特异性根长，根部N吸收，根生物质和热水可萃取根N）没有影响土壤蛋白酶的活性。我们表明，豌豆作物残留物，作为基材，是土壤蛋白酶活动的主要驱动因素。然而，我们的结果突出了考虑细根，了解植物对N矿化的土壤微生物活性的影响。

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