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首页> 外文期刊>Biogeosciences >Increased winter soil temperature variability enhances nitrogen cycling and soil biotic activity in temperate heathland and grassland mesocosms
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Increased winter soil temperature variability enhances nitrogen cycling and soil biotic activity in temperate heathland and grassland mesocosms

机译：冬季土壤温度变异性的增加增强了温带荒地和草地中生代的氮循环和土壤生物活性

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Winter air temperatures are projected to increase in the temperate zone,whereas snow cover is projected to decrease, leading to increased soiltemperature variability, and potentially to changes in nutrient cycling.Here, we experimentally evaluated the effects of increased winter soiltemperature variability on selected aspects of the N-cycle in mesocosmscontaining different plant community compositions. The experiment wasreplicated at two sites, a colder mountainous upland site with high snowaccumulation and a warmer and drier lowland site.Increased soil temperature variability enhanced soil biotic activity for bothsites during winter, as indicated by 35% higher nitrogen (N)availability in the soil solution, 40% higher belowground decompositionand a 25% increase in the potential activity of the enzymecellobiohydrolase. The mobilization of N differed between sites, and the15N signal in leaves was reduced by 31% in response to winterwarming pulses, but only at the cold site, with significant reductionsoccurring for three of four tested plant species at this site. Furthermore,there was a trend of increased N leaching in response to the recurrent winterwarming pulses.Overall, projected winter climate change in the temperate zone, with lesssnow and more variable soil temperatures, appears important for shifts inecosystem functioning (i.e. nutrient cycling). While the effects of warmingpulses on plant N mobilization did not differ among sites, reduced plant15N incorporation at the colder temperate site suggests that frostdamage may reduce plant N uptake in a warmer world, with importantimplications for nitrogen cycling and nitrogen losses from ecosystems.
机译：温带地区冬季空气温度预计会升高，而积雪预计会减少，从而导致土壤温度变异性增加，并可能导致养分循环的变化。在此，我们通过实验评估了冬季土壤温度变异性对选定地区的影响。包含不同植物群落组成的中观宇宙中的N循环在两个地点重复进行了该实验，一个是较冷的山区高地，雪地积雪较多，另一个是较温暖和较干燥的低地。 土壤温度变异性的增加提高了两个地点冬季的土壤生物活性，氮含量提高了35％（ N）在土壤溶液中的利用率，地下分解作用增加40％，纤维二糖水解酶的潜在活性增加25％。 N的动员因部位而异，响应冬季变暖脉冲，叶片中的 15 N信号降低31％，但仅在寒冷的部位，四种受试植物中的三种会显着降低在这个网站上。此外，由于反复出现的冬季变暖脉冲，氮的浸出量也有增加的趋势。 总体而言，预测的温带地区冬季气候变化，雪少且土壤温度变化多，对于改变生态系统功能似乎很重要（即营养循环）。虽然加热脉冲对植物氮素迁移的影响在不同地点之间没有差异，但在较冷的温带地区减少植物 15 N的掺入量表明，霜冻可能在温暖的世界中减少植物氮素的吸收，这对氮循环具有重要的意义。和生态系统的氮损失。

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