Departamento de Ciencias Agrarias y del Medio Natural, Escuela Politécnica Superior de Huesca, Instituto de Investigación en Ciencias Ambientales (IUCA), Universidad de Zaragoza, Ctra. Cuarte s/n, 22071 Huesca, Spain.
Departamento de Ciencias Agrarias y del Medio Natural, Escuela Politécnica Superior de Huesca, Instituto de Investigación en Ciencias Ambientales (IUCA), Universidad de Zaragoza, Ctra. Cuarte s/n, 22071 Huesca, Spain.
Sci Total Environ. 2018 Mar 15;618:1079-1087. doi: 10.1016/j.scitotenv.2017.09.127. Epub 2017 Nov 6.
Prescribed burning has been readopted in the last decade in the Central Pyrenees to stop the regression of subalpine grasslands in favour of shrublands, dominated among others by Echinospartum horridum (Vahl) Rothm. Nevertheless, the effect of this practice on soil properties is uncertain. The aim of this work was to analyse the effects of these burnings on topsoil organic matter and biological properties. Soil sampling was carried out in an autumnal prescribed fire in Buisán (NE-Spain, November 2015). Topsoil was sampled at 0-1cm, 1-2cm and 2-3cm depth in triplicate just before (U), ~1h (B0), 6months (B6) and 12months (B12) after burning. We analysed soil total organic C (TOC), total nitrogen (TN), microbial biomass C (C), soil respiration (SR) and β-D-glucosidase activity. A maximum temperature of 438°C was recorded at soil surface while at 1cm depth only 31°C were reached. Burning significantly decreased TOC (-52%), TN (-44%), C (-57%), SR (-72%) and β-D-glucosidase (-66%) at 0-1cm depth while SR was also reduced (-45%) at 1-2cm depth. In B6 and B12, no significant changes in these properties were observed as compared to B0. It can be concluded that the impact of prescribed burning has been significant and sustained over time, although limited to the first two topsoil centimetres.
在过去十年中，比利牛斯山脉中部重新采用了计划火烧，以阻止亚高山草地向以棘豆（Echinospartum horridum (Vahl) Rothm.）为主的灌丛退化。然而，这种做法对土壤性质的影响尚不确定。本研究旨在分析这些火烧对表土有机质和生物特性的影响。在 2015 年 11 月西班牙东北部比森（Buisán）的秋季计划火烧中进行了土壤采样。在火烧前（U）、~1 小时（B0）、6 个月（B6）和 12 个月（B12）后，在 0-1cm、1-2cm 和 2-3cm 深度分别采集三份表土样品。我们分析了土壤总有机碳（TOC）、总氮（TN）、微生物生物量 C（C）、土壤呼吸（SR）和β-D-葡萄糖苷酶活性。土壤表面记录的最高温度为 438°C，而在 1cm 深度仅达到 31°C。火烧显著降低了 0-1cm 深度的 TOC（-52%）、TN（-44%）、C（-57%）、SR（-72%）和β-D-葡萄糖苷酶（-66%），而 1-2cm 深度的 SR 也降低了（-45%）。与 B0 相比，B6 和 B12 时这些性质没有明显变化。可以得出结论，计划火烧的影响是显著的，并随着时间的推移持续存在，尽管仅限于前两个表土厘米。
